171results about How to "Increase superheat" patented technology

A dual (or multi) sectional evaporator system comprising first and second (or more) evaporator sections capable of cooling the air supply through the evaporator. The first evaporator section is positioned upstream of the second evaporator section (second upstream of the third and so on). However, the warmest refrigerant passes through the first evaporator section and the coldest refrigerant passes through the second evaporator section (or last evaporator section if more than two sections), such that the air supply is precooled prior to reaching the second (or last) evaporator. Providing a two (or more) passes of refrigerant through the dual (or multi) sectional evaporator system increases the superheat temperature out of the first evaporator up to about 25 degrees Fahrenheit, and / or increases the mass flow of refrigerant because of the increased heat exchange efficiency provided by counterflow heat exchange. Moreover, in the preferred embodiment for an A-coil or slant coil, the second evaporator section is positioned over the top of the first evaporator section such that the second evaporator overlays the first evaporator section in order to maximize the use of available space. Also, A-coil or slant coil forms of the present invention are configured such that they include contoured cut-out shaped corner portions wherein the squared corners of the evaporators are substantially eliminated thereby eliminating the dead air flow spaces typically associated with other known evaporators. The elimination of the dead air space allows the system to operate at a lower fan speed as well as allows the system to be constructed and operate within smaller confines.

The invention provides a low-temperature refrigerating control method of an air conditioner and the air conditioner. By the adoption of the low-temperature refrigerating control method of the air conditioner and the air conditioner, the technical problem that an air conditioner cannot conduct refrigeration continuously under a low-temperature condition is solved. The control method comprises the following steps that when the air conditioner conducts refrigeration, the outdoor environment temperature is detected; whether the detected outdoor environment temperature is lower than a set temperature threshold value or not is judged; and if so, the operation frequency of a compressor of the air conditioner is lowered to be within a preset frequency range, and the superheat degree of the air conditioner is increased by preset degrees. According to the air conditioner adopting the control method, the effect that an indoor heat exchanger cannot enter a freeze protection mode at the low temperature is guaranteed, the indoor heat exchange capacity is improved, and then the refrigerating capacity is improved; in addition, continuous operation of the compressor is achieved, and the technical effect of continuous refrigeration is achieved at the low temperature.

The invention relates to a grain boundary diffusion method for improving properties of sintered NdFeB magnets. The grain boundary diffusion method comprises the following steps of stacking sintered NdFeB magnets and diffusion alloy sheets together and placing in a hot-pressing furnace; vacuumizing the hot-pressing furnace until the vacuum degree reaches a set value, heating the hot-pressing furnace, and when the temperature of the hot-pressing furnace reaches a set value, beginning to exert a pressure and maintaining the pressure and putting the diffused sample into a high-vacuum furnace for annealing, wherein the diffusion alloy sheets are low-melting-point eutectic diffusion alloys and are represented by R-TM, R is one or more of Sc, Y, La, Ce, Pr or Nd and TM is one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Compared with the prior art, the sintered NdFeB magnets modified by the pressure diffusion method, which is provided by the invention, have the advantages of large diffusion depth of a diffusion agent, uniform distribution of grain boundary phases, high coercivity and the like, especially, low-melting-point diffusion alloys designed by the invention are free of expensive heavy rare earth element dysprosium and thus the cost of the raw materials is relatively low, the diffusion temperature is low and the energy consumption in the diffusion process is small.

The invention relates to the field of air conditioner control, in particular to a device and method for improving running reliability of a compressor. The device comprises a controller, the compressor, a four-way valve, an outdoor air cooling heat exchanger, a first outdoor unit stop valve, a second outdoor unit stop valve, a first heat exchanger and a detection device. The detection device acquires the discharge superheat degree; the controller adjusts the opening degree of a flow adjusting valve connected with the first heat exchanger according to the discharge superheat degree, and therefore the flow of gaseous refrigerant entering the first heat exchanger is controlled, the superheat degree of return air is improved, and the discharge superheat degree of the gaseous refrigerant discharged out of the compressor is made to meet requirements. According to the device and method, the liquid / gaseous refrigerant flowing to the compressor can be heated, and the discharge superheat degree of the gaseous refrigerant discharged out of the compressor is made to meet the requirements, so that the stable discharge superheat degree of an air conditioner can be kept at any environment temperature; therefore, the long-time running stability and reliability of the air conditioner are enhanced.

A steam engine increases efficiency and prevents corrosion, abrasion, and the like in a part receiving steam pressure. A heater and a cooler are provided on one side of a U-shaped fluid container, and a piston for output is provided on its other side. The heater heats working fluid to vaporize the fluid. The expansion pressure of steam of the working fluid depresses a fluid level in a first vertical pipe. The liquid component of the working fluid flows from the first vertical pipe into a second vertical pipe, thereby applying pressure to the piston in an upward direction. Then, the liquid component of the working fluid functions as a liquid piston directly receiving the expansion pressure of the steam, so that it is possible to prevent the occurrence of corrosion, abrasion and the like in the part receiving steam pressure.

Modularized, superheated steam generators comprise a steam module (46), a thermocouple module (41), and an electrode module (45) assembled within a containment enclosure (66). The multi-stage steam module (46) comprises a plurality of first stage pressure vessels (77) surrounding and feeding a second stage pressure vessel (78). The steam module (46) is coaxially surrounded by insulation (48) disposed within a cylindrical shroud (72). The electrode module (45) radiantly heats the steam module with resistive heating elements (119). The thermocouple module (41) includes thermocouples monitoring first stage temperatures within and between pressure vessels (77). PLC computer SCADA software (600) operates the generators. Thermocouple data is analyzed to control heater temperatures, the water feeding system (340), and outputted steam temperature. PLC software (600) provides operating logic (602) establishing a start up subroutine (602), a ramp up subroutine (603), a steady state subroutine (605), and a shut down subroutine (606).

The invention discloses a control method of an air conditioning system, which comprises the following steps: when entering a low-temperature heating mode, acquiring exhaust superheating temperature of the compressor; and when the exhaust superheating temperature is less than or equal to a first preset value within preset time, starting electric auxiliary heat to increase the return air superheating temperature of the compressor. The invention also discloses an air conditioning system. The control method can enhance the superheating temperature of the compressor of the air conditioning system when the air conditioning system operates in the low-load low-temperature heating mode, so that the coolant can be evaporated completely, thereby avoiding damaging the compressor.

The invention provides a system and method for recycling flue gas waste heat and water while white fog of a coal-fired power station chimney is eliminated. The system comprises an absorber absorbing water vapor in flue gas through a salt solution, a solution reproducer, a corresponding heat recycling system and an integrated system for flue gas heat recycling before wet desulphurization. By means of the system and method, white fog of the wet desulphurization coal-fired power station chimney can be eliminated, especially, white fog in winter is eliminated, waste heat and water of flue gas can be recycled, the energy utilizing efficiency of a power station is improved, and consumed water of the power station is reduced.

A container refrigeration apparatus includes: a refrigerant circuit which performs a refrigeration cycle, and includes a main circuit sequentially connecting a compressor, a condenser, a main expansion valve and an evaporator, and a hot gas bypass circuit through which a refrigerant compressed in the compressor bypasses the condenser and the main expansion valve to flow into the evaporator; and a compressor control section which controls operating speed of rotation of the compressor during heating operation for heating inside of a container by the evaporator while returning the compressed refrigerant from the compressor to the compressor through the hot gas bypass circuit and the evaporator so that a temperature inside the container reaches a target temperature.

The invention relates to a system for desulfurization, white smoke elimination and deep waste heat recovery based on an ammonia process. The system comprises a desulfurization tower, a circulating water tank, a heat exchanger, an absorption heat pump unit, a flue gas cooling section, a flue gas heating section, an inlet flue and an outlet flue; the desulfurization tower above a concentration tankis coaxially provided with a concentration section, a desulfurization section, a water washing section and a defogging section from the top to bottom in sequence; the inlet flue is arranged on the desulfurization tower between the concentration tank and the concentration section in a communicated mode; the outlet flue is arranged at the top of the desulfurization tower above the defogging sectionin a communicated mode; the heat exchanger and the absorption heat pump unit can perform two-stage cooling on circulating water, and can perform two-stage heating on supplemented boiler water; the supplemented boiler water can flow through the heat exchanger and the absorption heat pump unit to achieve two-stage heating. The system has the advantages of high desulfurization efficiency and high heat recycling rate, and flue gas desulfurization, white smoke elimination and deep waste heat recovery can be simultaneously realized.

A warm machining technology for making Ti or Ti-alloy pipe includes such steps as machining surface of pipe blank, preheating to a temp between ambient temp and recrystallizing temp, high-speed rolling at temp higher than recrystallizing temp, and fast cooling. Its advantages are simple process, high utilization rate of material, low cost and high quality.

The invention discloses a heat pump air conditioning system and a control method thereof. The heat pump air conditioning system comprises a compressor, a four-way valve, an evaporator, a condenser, a first throttling device, a second throttle device, a heat recovery device and a heat exchange device; heat exchange is performed on a refrigerant which is located in a first channel and a refrigerant which is located in a second channel in the heat recovery device; heat exchange is performed on a refrigerant which is located in a third channel and a refrigerant which is located in a fourth channel in the heat exchange device. According to the heat pump air conditioning system, a gaseous refrigerant which is supplied by the heat exchange device is added into the compressor when the heat pump air conditioning system is located in the low temperature state and accordingly the heating capacity is ensured when the heat pump air conditioning system is located in the low temperature state, the displacement of the exhaust opening of the compressor is ensured, the exhaust temperature is reduced, and meanwhile the damage to the compressor due to liquid impact of the refrigerants is prevented.

A water heater with heating-supply from a transcritical carbon dioxide heat-pump comprises a transcritical carbon dioxide heat-pump system, a hot-water supply system and a heating circulation system. The transcrtical carbon dioxide heat-pump system comprises a compressor, a first gas cooler, a second gas cooler, a heat regenerator, an expansion valve, an evaporator and the other heat regenerator which are sequentially positioned on a first circulation pipeline; the hot-water supply system comprises a water tank, a first pump and a hot water outlet valve, wherein the water tank comprises a high-temperature zone A, an intermediate-temperature zone B and a low-temperature zone C; and the heating circulation system comprises a second gas cooler, a second pump and end equipments which are positioned on a second circulation pipeline. The invention reduces the temperature of dioxide carbon at the inlet of the expansion valve and respectively raises the superheat degree of dioxide carbon at the inlet of the compressor and EER of heat-pump circulation so as to ensure the lower temperature of water entering the gas cooler from the water tank; the reduction of the temperature of the first gas cooler enhances the efficiency of the heat-pump system; and both high-temperature water and intermediate-temperature water can be provided according to requirement of users.

The invention relates to a powder preparation method for an induction heating and radio frequency plasma combined atomizing powder system. The powder preparation method comprises the following steps that (1), raw materials are prepared and processed; (2), the system is pre-vacuumed and a protective atmosphere is established; (3), wire materials are straightened and conveyed; (4), high-frequency induction preheating is carried out; (5), radio frequency plasma melting is carried out; (6), powders are prepared by atomizing; (7), separation and dust removal are carried out; and (8), the powder size is graded. The powder preparation method for the induction heating and radiofrequency plasma combined atomizing powder system uses high purity metal wire material instead of the powders as the raw materials, so that the carrying of raw materials to adsorb gas and water is reduced; a technology of the high frequency induction heating combined with the radio frequency plasma smelting and gas atomization is adopted, during the whole process of heating, melting, and the gas atomization is free of pollution and impurities in the protective atmosphere, and the degree of superheat of liquid flow ordroplets is increased during the process of radio frequency plasma smelting; and high quality spherical powders can be obtained by adopting high pressure atomizing nozzles atomizing, and the yield ofmetal powders per unit time is increased.

The invention discloses a method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology, which comprises the following steps of: combining zone melting and liquid metal cooling, and performing directional solidification on a plurality of precast bodies formed by using aluminum oxide, yttrium oxide and zirconium oxide respectively; and taking the longitudinal sections and the transverse sections of the directional solidified precast bodies, performing conventional metallographic treatment, and performing surface metal spraying to obtain tissue morphology and interface morphology of the aluminum oxide-based ternary eutectic oxide melt grown ceramic at different growth rates. In the directional solidification, the withdrawing rate is 1 to 10,000mum / s, and the laser power is 200 to 1,500W. The obtained directional solidification tissues are greatly different from the tissues in a melting zone and have no obvious tissue transition zone, and the interface morphologyis preserved perfectly.

The invention discloses an air conditioner, which comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling element, an indoor unit assembly and an ejector, wherein the compressor is provided with an exhaust port, a return air inlet and a jet orifice; the ejector is provided with a first inlet, a second inlet and an outlet; the first inlet is connected with the exhaust port by a first control valve; the second inlet is connected with the second end of the first throttling element by a second control valve; the outlet is connected with the jet orifice; and when the air conditioner is operated in a low-temperature heating status, the first control valve and the second control valve are opened, refrigerants which enter the ejector from the first inlet and the second inlet are mixed and are discharged from the outlet, and the refrigerants return to the compressor through the jet orifice. According to the air conditioner provided by the embodiment of the invention, the ejector can heat middle supplementary air by virtue of high-temperature exhaust air, so that the degree of superheat of the middle supplementary air is improved; and meanwhile, a part of loss due to pressure reduction of high-pressure fluid can be recycled by the ejector, so that the capacity and the energy efficiency of the air conditioner can be improved.

The invention discloses a thermal device and method for increasing temperature of clean boiler smoke obtained by wet desulphurization. The thermal device comprises a boiler body, a tail smoke treatment device and a clean smoke heating device, wherein the tail smoke treatment device comprises a dust remover and a wet desulphurization device; clean smoke is obtained after the boiler smoke passes through the wet desulphurization device; the clean smoke is heated by the clean smoke heating device and then discharged into a chimney. The method comprises the following steps: adjusting the amount of smoke entering a bypass smoke channel by virtue of a bypass smoke channel adjusting baffle; heating cold air in an air heater by hot smoke in the bypass smoke channel; feeding the obtained high-temperature hot air into a clean smoke channel behind the wet desulphurization device; mixing the high-temperature hot air with the clean smoke by a mixer; and increasing the mixed smoke temperature to over an acid dew point and discharging the mixed smoke by virtue of the chimney. According to the thermal device and method for increasing temperature of the clean boiler smoke obtained by wet desulphurization, the hot smoke energy is transferred to the clean smoke by taking hot air as a heat medium; the corrosion to the chimney is reduced; the smoke diffusion range is widened so as to prevent gypsum rain from generating at the periphery of a power plant.

The invention discloses a thermoelectric heat regeneration system. The thermoelectric heat regeneration system comprises a refrigerating unit and a thermoelectric heat regeneration unit. The refrigerating unit comprises a compressor, an air cooling type condenser, a throttling valve, an air cooling type evaporator and circulating pipelines. The thermoelectric heat regeneration unit comprises a thermoelectric pile, heat exchangers and a bypass branch circuit controller; the hot end and the cold end of the thermoelectric pile are connected with the hot end heat exchanger and the cold end heat exchanger correspondingly; the hot end heat exchanger is connected with the circulating pipeline coming out of the evaporator, heats steam coming out of the evaporator and improves the overheating degree of a refrigerant; the cold end heat exchanger is connected with the circulating pipeline coming out of the condenser, cools liquid coming out of the condenser and improves the overcooling degree of the refrigerant; and the bypass branch circuit controller can control the flow rate of the refrigerant passing through the heat exchangers and widens the heat exchange range. Compared with a traditional heat regenerator, the thermoelectric heat regeneration system can accurately adjust and control the overcooling degree and the overheating degree of the refrigerant and has the beneficial effects of being small in size, simple in structure, easy to install, convenient to control, free of noise and environment-friendly.

An air conditioning refrigerating device comprises a high back pressure rotary compressor; an outlet of the high back pressure rotary compressor is connected with an inlet of a condenser; an outlet of the condenser is connected with a liquid inlet of a heat regenerator; the liquid outlet of the heat regenerator is connected with an inlet of a swelling valve; an outlet of the swelling valve is connected with an inlet of an evaporator; an outlet of the evaporator is connected with an air inlet of the heat regenerator; an air outlet of the heat regenerator is connected with an inlet of the high back pressure rotary compressor. According to the air conditioner refrigerating device, refrigerant firstly enters into the high back pressure rotary compressor, enters into the compressor after being compressed into high temperature high pressure air, then is condensed into intermediate temperature high temperature liquid and discharges heat to the air; the refrigerant then flows through the heat regenerator to enter into the swelling valve to be throttled to be in a low temperature low pressure air-liquid mixed state; then the refrigerant enters into the evaporator to change heat with the air in the environment to enable the air temperature to be reduced; accordingly the refrigerating effect is achieved. The air conditioner refrigerating device has the advantages of improving the compressor efficiency and a refrigeration coefficient of a refrigeration system and being good in lubricating oil return.

The invention discloses a device and a method for controlling superheat degree of molten steel in a continuous casting ladle or a tundish. The device comprises a temperature measuring device for measuring the temperature of the molten steel in the continuous casting ladle or the tundish, and a temperature control device for controlling the temperature of the molten steel in the continuous casting ladle or the tundish; the temperature control device comprises a scrap body material or a steel bar, a device for moving the scrap body material or the steel bar, and an electroslag heating device; the device for moving the scrap body material or the steel bar can insert the scrap body material or the first end of the steel bar into the internal part of a slag in the continuous casting ladle or the tundish, and can insert the scrap body material or the first end of the steel bar into the internal part of the molten steel; the slag is arranged above the molten steel and contacts the molten steel, and the electroslag heating device is electrically connected to the scrap body material or the steel bar, so that the current flows through the slag to heat the slag when the scrap body material or the first end of the steel bar is inserted into the internal part of the slag.

The invention provides a multi-split air conditioning system. The multi-split air conditioning system comprises an indoor unit, multiple outdoor units and super-cooling devices, wherein the multiple outdoor units are communicated with the indoor unit through pipelines after being connected in parallel, the super-cooling devices are detachably arranged on the pipelines, and the super-cooling devices are communicated with the indoor unit and the multiple outdoor units which are connected in parallel. The multi-split air conditioning system provided by the invention is provided with the multiple outdoor units which are connected in parallel, the super-cooling devices are detachably arranged on the pipelines, whether the super-cooling devices need to be arranged or not can be selected by a user according to self needs, and the super-cooling devices can be arranged in any positions on the pipelines; compared with a mode of arranging the super-cooling devices in the outdoor units in the prior art, the super-cooling devices are detachably arranged on the pipelines, on one hand, the using amount of the super-cooling devices is effectively reduced, the problem of resource waste is avoided, and thus the production cost of the multi-split air conditioning system is effectively reduced; on the other hand, the size of the outdoor units is effectively reduced, thus the conveying amount of the outdoor units is increased, and the conveying cost is reduced.

The invention relates to a water source heat regeneration type high temperature heat pump. According to the water source heat regeneration type high temperature heat pump, through water source overcooling heat pump circulation, a refrigerant is deeply overcooled to ensure that an expansion valve can work reliably for a long time; through water source heat regeneration circulation, sensible heat generated by deeply overcooling the refrigerant, cooling oil and the like is recycled and used for increasing the water source inlet temperature and the evaporating temperature, reducing the compression ratio of the heat pump to ensure that the heat pump can work efficiently, and reducing the exhaust temperature of the compressor to ensure that the compressor can work reliably for a long time; and besides, unlike the multi-loop circulation in an economizer or a heat regenerator and the like, the fluctuation of heating load and water source temperature does not make the water source high temperature heat pump work unsteadily, so that an electronic expansion valve is not needed to solve the fluctuation problem.

The invention provides an enhanced vapor injection air conditioning system and a control method thereof. A first port of a four-way reversing valve communicates with a first port of an indoor heat exchanger, a second port of the four-way reversing valve communicates with a first port of an outdoor heat exchanger, a third port of the four-way reversing valve communicates with an exhaust hole of a compressor, and a fourth port of the four-way reversing valve communicated with a gas return hole of the compressor. A second port of the indoor heat exchanger communicates with an inlet of a flash-tank. A second port of the outdoor heat exchanger communicates with an outlet of the flash-tank. A gas-state cold medium outlet of the flash-tank communicates with a jet hole of the compressor through ajet pipeline. A throttling device is arranged on the jet pipeline. An electronic throttling valve is arranged at the inlet of the flash-tank, and an electronic expansion valve is arranged at the outlet of the flash-tank. The indoor heat exchanger and the outdoor heat exchanger communicate through the electronic throttling valve, the flash-tank and the electronic expansion valve. The gas-liquid separating effect can be improved, it is avoided that a liquid-state cold medium directly returns to a compressor and failures caused by liquid returning happen to the compressor, and therefore the failure and abrasion risks of the compressor are effectively reduced.

The invention discloses a wet flue gas desulfurization tower with a deep dehumidification function and a dehumidification process. Desulfurization spraying layers, demisters and a dehumidifier are sequentially arranged in the desulfurization tower from the middle part to the upper part, wherein the dehumidifier comprises dehumidification nozzles and a liquid receiving device arranged below the dehumidification nozzles. The wet flue gas desulfurization tower has the benefits as follows: the wet flue gas desulfurization tower integrates functions of desulfurization, demisting and dehumidification, and flue gas discharged from the desulfurization tower is not saturated wet flue gas with 100% relative humidity, but unsaturated and wet flue gas with adjustable and controllable relative humidity; the dew point temperature of the flue gas is reduced, the temperature is increased, the superheat degree is improved, the phenomena of white smoke and stack rain formed due to flue gas condensation are fundamentally avoided, and expensive materials used for corrosion prevention of a chimney are not required; the system flow is simplified, the equipment function integration degree is high, and the device occupies little land.

The invention provides a thermosyphon type defrosting dual-channel oil and gas recovery condensing unit. In a refrigeration system of each stage, a first compressor, a condenser, a first liquid accumulator, a thermosyphon heat exchanger, a first valve, a first expansion valve, a first evaporator, a second valve and a first gas-liquid separator are sequentially connected so as to form a first condensation loop; the thermosyphon heat exchanger, a third valve, the first evaporator and a fourth valve are sequentially connected so as to form a first thermosyphon loop. The evaporator of the refrigeration system is used for defrosting, and the temperature is basically maintained to be 30 DEG C, so that the safety of oil gas used as combustible gas can be improved. Furthermore, passive thermosyphon heat exchange is adopted, and internal circulation is performed by means of evaporation rise and condensation downflow, so that the cooling capacity inside the frost is brought to a liquid pipe. Furthermore, the superheat of the liquid pipe is improved, and the energy efficiency ratio of the refrigeration system is improved. A refrigerant bypass is not involved, so that little effect is caused on the performance of the refrigeration system.

The invention relates to a preparation method for a sintered neodymium-iron-boron magnet with high coercivity and low remanence temperature sensitivity. The preparation method comprises the steps of taking a Dy-Co alloy diffusion sheet as a diffusion source for the sintered neodymium-iron-boron magnet; performing thermal insulation at a temperature which is higher than the Dy-Co alloy melting point; and enabling the melted Dy-Co alloy liquid to be diffused to the interior of the neodymium-iron-boron magnet along grain boundary to form a Dy-rich and Co-rich composite shell-shaped structure on the edges of crystal particles. Due to the presence of the Dy-rich and Co-rich composite shell-shaped structure, the coercivity and remanence temperature stability of the sintered neodymium-iron-boron magnet can be greatly improved; compared with the prior art, the Dy-rich and Co-rich composite shell-shaped structure prepared by the method can improve the coercivity and the remanence temperature stability as well; and the sintered neodymium-iron-boron magnet which is diffused and modified by a crystal boundary diffusion process provided by the invention has the advantages of high diffusion depth of a diffusant, uniform grain boundary phase distribution, high coercivity, low magnet remanence temperature sensitivity coefficient and the like.

The invention discloses titanium or titanium alloy spherical powder with rare earth oxide distributed on the surface. Flaky rare earth oxide with the equivalent diameter being 100-1000nm and the thickness being 20-50nm is in dispersed distribution on the surface of the powder; and with formation of the rare earth oxide, the surface properties of the powder and the adhesion performance among the powder are changed, bonding among the powder is reduced, the quantity of satellite powder is reduced, the quality of the powder is improved, and a new raw material selection is provided for 3D printingof titanium or titanium alloy. In addition, the invention further provides a preparation method for the titanium or titanium alloy spherical powder. In the method, by using the titanium or titanium alloy and rare earth metals, including yttrium, neodymium and gadolinium, as raw materials and controlling technological parameters of a vacuum induction melting gas atomization powder preparation, oxidation of the rare earth metals before being unmolten is reduced, the fluidity of a melt is improved, a pressure difference between a smelting chamber and an atomization chamber is increased, and preparation of the titanium or titanium alloy spherical powder with the rare earth oxide distributed on the surface is realized.

The invention discloses a method for improving the corrosion resistance of neodymium-iron-boron magnet by carrying out grain boundary diffusion on Al-Cu alloy, belonging to the field of rare earth magnetic materials. According to the method, an Al-Cu alloy ordinary ingot which has a low melting point and high potential is directly used as a surface diffusion source of the neodymium-iron-boron magnet after being coarsely crushed and ball-milled, and an Al-Cu-rich thin layer is formed at the crystal boundary of the neodymium-iron-boron magnet after diffusing heat treatment and annealing heat treatment are carried out, so that the neodymium-iron-boron magnet with high corrosion resistance is obtained. According to the method, Al-Cu alloy is taken as the diffusion source, thus avoiding the phenomenon that the residual magnetism of the magnet is reduced since Al and Cu elements are not directly added into the ingot, and the non-magnetic Al and Cu enter a principal phase so as to generate a magnetic dilution effect; the corrosion resistance and magnetic property of the magnet also can be improved since the grain boundary diffusion can improve the chemical stability of a grain boundary phase, optimize a microstructure, improve the distribution of the grain boundary phase, and increases the density of the magnet.

The invention provides a method for obtaining the texture topography of alumina-based binary eutectic melt growth ceramic. The method comprises the following steps of: with a laser beam as a heating source and liquid gallium-indium-tin alloy as a cooling medium, respectively carrying out directional solidification on prefabticated members consisting of alumina and rare earth oxide; taking the vertical section and the cross section of each prefabticated member and performing conventional metallographical treatment; and carrying out surface metal spraying to finally obtain the texture topographies and the interface topographies of the alumina-based binary eutectic melt growth ceramic at different growth rates. In directional solidification, draw rate is 1mu m / s-10000 um m / s, and laser poweris 200W-1500W. By using the method, the obtained directional texture is quite different from a texture in a melting area and has no obvious texture transition area, and interface topography is preserved very well.