186 results about "Nickel chromium alloy" patented technology

The present invention belongs to the technical field of air sterilizing and purification and in particular relates to a plasma air sterilizing and purifying device and an air sterilizing and purifying method. The plasma air sterilizing and purifying device comprises a plasma reactor, a pulse power supply, a fan component, a control device, a power adaptor, and a housing case, wherein the reactor is provided with positive electrodes formed by several nickel-chromium alloy wires or nickel-chromium alloy belts, and the two ends of each positive electrodes are fixed in the corresponding grooves on the micro-discharge preventive conductor rail; and a pulse power supply has a digital control circuit with an oscillator, an error amplifier and a PWM comparator inside which converts signals into a digital control current to control the width of the high-voltage pulse.

The invention relates to a nickel-chromium alloy metallographic corrosion solution and a corrosion method. The corrosion solution is a mixed solution of concentrated nitric acid, concentrated hydrochloric acid, glacial acetic acid and water in a volume ratio of 1:1:1:1. The concrete steps include: (1) preparing the corrosion solution, firstly adding water into a container, then adding concentrated nitric acid, concentrated hydrochloric acid and glacial acetic acid respectively, conducting stirring and then performing standing for 10-20min; (2) dripping the corrosion solution on the corrosion surface of a ground and polished nickel-chromium alloy metallographic sample, immersing the sample into the corrosion solution to a depth of 1-2mm, and controlling the corrosion time at 10s-10min; (3) flushing the sample surface with distilled water for more than 2min; and (4) flushing the sample surface with alcohol, and then wiping the sample surface with alcohol-carrying absorbent cotton. According to the invention, the corroded metallographic sample has obvious grain contrast and clear grain boundary line, and at the same time, the defects of under-corrosion and over-corrosion can be avoided. The corrosion solution can rapidly and efficiently corrode the metallographic structure of the sample.

The invention discloses a preparation method of a high-resistance electrothermal alloy wire, and relates to the iron chromium aluminum alloy processing and manufacturing field. The preparation method includes five technological processes of blank preparation, annealing treatment, alkali washing, cleaning and wiredrawing treatment; in the annealing treatment process in the preparation method, through strict control of the heating temperature and the holding time of a box type resistance furnace, the internal organization of a nickel-chromium alloy wire is improved, the plasticity is increased, and the subsequent drawing technology is facilitated; in the alkali washing process, through well control of the temperature and time of alkali washing, an oxidation film of the surface of the nickel-chromium alloy wire is removed relatively thoroughly, the impurity residual amount is precious little, and the surface is smooth; and the nickel-chromium alloy wire prepared by the preparation method has high-temperature oxidation resistance greatly improved, has the advantages of high electrical resistivity, high mechanical strength under high temperature conditions, long service life, simple production process, and easy realized automation production.

The invention relates to a thermotolerant corrosion-resistant flexibility-resistant cable belonging to the technical field of special cables and comprising a cable core, a shielding layer and an outer sheath, wherein the shielding layer is arranged outside the cable core, the outer sheath is arranged outside the shielding layer, the cable core comprises a lead, a filler and a wrapping layer, and the lead comprises a conductor and an outer coating layer coated outside the conductor. The thermotolerant corrosion-resistant flexibility-resistant cable is characterized in that the filler is aramid fiber and surrounds the lead; the conductor is formed by stranding nickel-chromium alloy wires or nickel-aluminum alloy wires; the outer coating layer and the wrapping layer are both Teflon; and the outer sheath is irradiation crosslinking fluorubber. The thermotolerant corrosion-resistant flexibility-resistant cable has ideal beading resistance and excellent performances of high-temperature resistance, chemical corrosion resistance and radioactive ray resistance and also has a feature of environmental protection.

The invention discloses a process for wear-resistant treatment of a valve core of an instrument valve. A method for coating a nickel-chromium alloy coating on the valve core comprises the steps of (1) preparing nickel-chromium alloy powder comprising the following chemical components in percentage by weight: 0-3.8% of Re, 45-50% of Ni, 20-30% of Cr, 1.6-5.6% of Si, 0.5-4% of C, 10-20% of Fe, 1.2-8.4% of Cu and 1-2.2% of composite rare earth; (2) washing the processed valve core, then drying the valve core in drying equipment, then putting the valve core into spraying equipment, uniformly spraying tiny sand grains on the surface of the valve core by using a spray gun at first, and then uniformly spraying the nickel-chromium alloy powder on the surface of the valve core by using the spray gun; (3) cooling the valve core to the room temperature in a first cooling process, and then cooling the valve core to the room temperature in a second cooling process; (4) inspecting the cooled valve core and putting the cooled valve core in storage. The process disclosed by the invention improves the wear resistance, corrosion resistance and the like of the valve core.

The invention relates to nickel-chromium alloy electroplate liquid. A liter of the electroplate liquid comprises from 25g to 35g of nickel sulfate hexahydrate, from 80g to 100g of chromium trichloride hexahydrate, from 30ml to 40ml of formic acid, from 20g to 30g of boric acid, from 1g to 60g of urea, from 30g to 80g of ammonium chloride, from 40g to 60g of potassium chloride, from 30g to 60g of critic acid, from 0.1g to 0.12g of sodium dodecyl sulfate, from 1.5g to 2.5g of saccharin, from 2ml to 4ml of nickel plating brighteners and the balance water. The urea is used as a coordination additive, and the performance of the electroplate liquid is greatly improved, so that behaviors of electrodes, the covering power and the dispersing power of a cathode and the stability, the coating performance and the contamination status of the electroplate liquid are greatly improved.

The invention discloses a corroding method for a metallographic specimen of a high nickel-chromium alloy. The method comprises the following steps: soaking a pretreated metallographic specimen in a corrosive liquid with a corrosive face facing downward; and slowly lifting up the specimen above the liquid level of the corrosive liquid, wherein the peak of a corrosive drop on the corrosive face is contacted with the liquid level of the corrosive liquid. The display method of the metallographic structure of the alloy specimen provided by the invention is suitable for high nickel-chromium alloy which is hard to corrode by conventional methods. By selecting a proper corrosive liquid, the high nickel-chromium alloy specimen is corroded by virtue of the method disclosed by the invention, so that surface passivation of the corrosive face of the specimen can be eliminated. The corrosive degree can be controlled, the metallographic structure is clearly displayed and the operating method is simple and convenient.

The invention discloses a neutral-point grounding resistance cabinet, and relates to a resistance cabinet. The neutral-point grounding resistance cabinet comprises a cabinet body, nickel-chromium alloy resistors, horizontal insulators, vertical insulators, support insulators, a support and a voltage transformer, wherein the support is arranged in the cabinet body; a grounding connection hole is formed in a cabinet bottom below the support; three rows of the nickel-chromium alloy resistors are arranged on the support through the support insulators; the both ends of each of the nickel-chromium alloy resistors are fixed on side plates through the horizontal insulators; the adjacent nickel-chromium alloy resistors are insulated and fixed through a plurality of the vertical insulators; the nickel-chromium alloy resistors are further connected with the voltage transformer. The neutral-point grounding resistance cabinet disclosed by the invention is good in insulativity, high in safety, capable of avoiding the occurrences of accidents, and capable of playing current-limiting and voltage-dropping roles in case of a grounding fault.

The invention relates to a GST high strength toughness sea water corrosion resistant iron casting which is a low nickel chromium alloy iron casting, comprising a seawater or sewage waterborne engineering gate, a gate slot embedded part, parts such as trash screens, a seawater or sewage pump housing, an impeller, conveying pipelines, a pipe fitting, a valve and the like. The tensile strength of the iron casting is greater than or equal to 450MPa, its elongation percentage is greater than or equal to 5% and its corrosion speed in seawater is less than or equal to 0.10mm/a; The mass percent of iron casting alloy elements is as follows: 2.80-3.60 of C, 1.60-2.60% of Si, 0.40-1.2% of Mn, 0.80-1.8% of Cr, 0.8-3.2% of Ni, 0.6-1.5% of Cu and the balance being Fe. According to the invention, technologies of intermediate frequency induction furnace melting, compound reinforced inoculation and lost foam casting are adopted to obtain the GST high strength toughness seawater corrosion resistant iron casting with uniform chemical component and microstructure as well as excellent mechanical properties.

The relates to a room-temperature NO2 sensor based on graphene-coated alpha-Fe2O3 compound and a preparation method thereof, which belong to the technical field a semiconductor metal oxide gas sensor.The sensor comprises a sold Al2O3 insulation ceramic tube having two annular gold electrodes, a semiconductor sensitive material coating the annular gold electrode and the Al2O3 insulation ceramic tube, and a nickel-chromium alloy heating coil passing through the Al2O3 insulation ceramic tube. The graphene-coated alpha-Fe2O3 compound sensitive material is obtained by water bath and a hydrothermalmethod, a high specific surface area of graphene, gas adsorption capability, a fast carrier migration rate and good conductivity, and heterojunction formed between graphene and the alpha-Fe2O3 are used, so that a chemical reaction of the surface of detected gas is increased, charge transfer between rGO and alpha-Fe2O3 is formed, sensitive characteristic of the sensor on NO2 is effectively increased, work temperature of the sensor is reduced to room temperature, and the sensor has a wide application prospect on the NO2 content aspect in detection microenvironment.

The invention discloses a method for smelting chromel alloy by stainless steel dedusting ash and laterite-nickel ore. The method comprises the steps as follows: a stainless steel dedusting ash briquette is manufactured; the stainless steel dedusting ash briquette is added into the laterite-nickel ore, the laterite-nickel ore is placed in an electric plasma furnace to be molten into a mother liquid, the temperature of the molten mother liquid ranges from1,650 DEG C-1,750 DEG C; coke is added for smelting after the mother liquid is molten completely, the smelting temperature is controlled in a range from 1,650 DEG C to 1,750 DEG C simultaneously, and an additive is simultaneously added for an early reduction reaction for 1-2 hours; after the early reduction reaction is finished, a fluxing agent and calcium carbonate are added for continuous reduction reaction for 1-2 hours, so that a metal liquid is obtained; the temperature of the metal liquid is adjusted in a range from 1,650 DEG C to 1,750 DEG C, dregs are removed, and the metal liquid is remained; and pouring is performed to form ingots. With the adoption of the method, waste is reused, so that pollution of the waste on the environment is reduced; and further, steel-making dedusting ash and the laterite-nickel ore are sufficiently combined for smelting, and the chromel alloy with high recovery rate and high content is obtained through addition of an NCP-2 additive.

The invention discloses a high-resistance electric heating alloy wire for an electric heating element. The high-resistance electric heating alloy wire comprises a nickel-chromium alloy body, wherein the nickel-chromium alloy body is coated in the way of 1, adding 1-2 parts by weight of sodium sulfate, 0.7 part by weight of bis-imidazoline, 1.9 parts by weight of gamma-methacryloxy propyl trimethoxyl silane and 2.2 parts by weight of alkylethoxylate carboxylate to 40 parts by weight deionized water in sequence, and conducting uniform stirring; 2, adding 4.3 parts by weight of propylene glycol phenyl ether, 5.5 parts by weight of acrylonitrile, 1.6 parts by weight of sodium secondary alkyl sulfonate and 0.7 part by weight of 2-aminoethyl heptadecenyl imidazoline in sequence, and continuing stirring till sufficient and uniform mixing is achieved, so that coating treatment fluid is obtained; 3, placing the nickel-chromium alloy body in the coating treatment fluid to be soaked, and taking the nickel-chromium alloy body out to be dried. By coating the surface of the nickel-chromium alloy body with a protective film, performances are good, and surface smoothness is high.

The invention discloses a door/window-coated nickel-chrome alloy coating. The nickel-chrome alloy coating comprises the following chemical components in percentage by weight: 1.21-1.23% of C, 0.53-0.57% of Zn, 4.32-4.35% of Cu, 0.25-0.28% of Mg, 0.55-0.58% of K, 22.3-22.5% of Cr, 0.21-0.23% of Si, 1.52-1.55% of Fe, 0.23-0.25% of Co, 8.4-8.6% of Al, 4.65-4.68% of rare earth and the balance of Ni and micro-impurity. The door/window-coated nickel-chrome alloy coating has the advantages that the strength of door/window can be improved, the high temperature resistance is good, and friction and corrosion resistances are also achieved; the nickel-chrome alloy coating can be used under bad environment, and the service life is long; a provided heat treatment process not only can reduce the machining cost, but also can shorten the machining cycle.

The invention discloses a high-tenacity high-hardness flux-cored wire. The high-tenacity high-hardness flux-cored wire is formed by wrapping a low-carbon cold-rolled steel strip sheath around the outer side of a flux core. The flux core comprises the raw materials including, by weight, 30-40 parts of high-carbon ferrochrome, 5-15 parts of chrome, 11-25 parts of rare earth fluoride, 1-2.8 parts of calcium carbonate, 1-4 parts of ferromolybdenum, 1-4 parts of ferrovanadium, 6-10 parts of cobalt powder, 2-6 parts of electrolytic manganese, 1-1.8 parts of graphite, 6-10 parts of nickel-chromium alloy, 0.5-1.5 parts of tungsten powder, 2-8 parts of aluminum oxide, 9-14 parts of titanium diboride powder, 6-8 parts of low-silicon iron, 1-5 parts of feldspar, 1-2 parts of magnesite and 100-180 parts of iron powder. The high-tenacity high-hardness flux-cored wire is reasonable in chemical component ratio and high in tenacity and corrosion resistance, and the hardness of a welded joint is high.

The invention discloses a porous foam iron-nickel-chromium alloy material preparation method, which comprises: selecting a porous material, and at a room temperature, immersing in an aqueous polymer binder; uniformly spraying the surface of the porous material immersed in the aqueous polymer binder by using nanometer chromium powder; drying; separating the excess chromium powder from the porous material matrix; coating the chromium porous material by using an electric conduction glue in an impregnated manner; carrying out heating and curing treatment on the chromium porous material, and electrodepositing an iron-nickel alloy; carrying out redox treatment; and carrying out secondary chromium diffusion treatment to obtain the porous foam iron-nickel-chromium alloy material. According to the present invention, the preparation method is scientific, the selected process parameters are reasonable, the quality is easy to control, the cost is low, the product with characteristics of light weight, large specific surface area, high thickness of 5-100 mm, high porosity of 96-99.9%, excellent high-temperature resistance and excellent corrosion resistance, and capable of being used under harsh working conditions such as high temperature, corrosion and the like can be prepared, and the product is particularly adopted as the high temperature filtration material, the chemical industry catalysis material, the carrier material, the burner gas distribution material, the high temperature flame retardant material, and other materials.