34results about How to "Grain stabilization" patented technology

The invention discloses a method for making ultrafine grained steel, comprising the steps of: heating carbon steel to a temperature of 1200-1240DEG C to carry out austenization, wherein the carbon steel contains 0.02-0.20% of carbon and 0.40-1.60% of manganese by mass fraction; controlling to roll by using an austenite recrystallization area and an austenite non-recrystallization area; performing another deformation near an Ar3 temperature by combining the deformation induced ferrite transformation technology so as to restrain the reverse transformation from the ferrite to the austenite after twice transformation, accumulate mass storage energy of the second transformation, increase the nucleation points of the ferrite, and promote the increase of the volume fraction of the ferrite; and finally cooling to a temperature of 600-650DEG C at a cooling speed of 1-10DEG C / micron for air cooling. The ferrite grain dimension of the prepared ultrafine grained ferrite steel is less than 3.0 microns. The manufacturing method of the ultrafine grained steel does not need large deformation and ultrafast cooling process, and has small mill load and simple process; and the obtained room-temperature ultrafine ferrite grains are stable.

The invention relates to a high-toughness carburized bearing steel with ultra-long contact fatigue life and a preparation method thereof, belonging to the technical field of alloy steel. The steel comprises the following chemical components in percentage by weight: 0.16-0.24% of C, at most 0.10% of Si, at most 0.10% of Mn, 0.30-1.50% of Cr, 1.5-4.5% of Ni, 0.30-1.50% of Mo, 0.02-0.10% of Nb, 0.3-0.9% of V, and the balance of Fe and inevitable impurities, wherein [N]+[O]+[H]+P+S<=0.0080%, and Ti<=0.0030%. The invention particularly relates to a high-toughness carburized bearing steel which has the advantages of high shock resistance load, stable dimension and ultra-long contact fatigue life in the serve process. Compared with the prior art, the invention has the advantages of high surface hardness, high core toughness, high dimensional stability, high bending fatigue strength limit and ultra-long contact fatigue life.

The invention provides a production method of a tantalum target and a tantalum target component. The production method of a tantalum target comprises the following steps of providing a tantalum ingot; performing hot forging on the tantalum ingot to form a first tantalum target blank; performing first heat treatment on the first tantalum target blank to form a second tantalum target blank, wherein the temperature of the first heat treatment is 1,000-1,200 DEG C, and the temperature is maintained for 30-90 minutes; after the first heat treatment, performing hot rolling on the second tantalum target material to form a third tantalum target blank; performing second heat treatment on the third tantalum target blank to form the tantalum target, wherein the temperature of the second heat treatment is 1,000-1,200 DEG C, and the temperature is maintained for 30-90 minutes. By adopting the technical scheme, the produced tantalum target has relatively uniform internal organization and good magnetic property; moreover, by adopting the tantalum target to produce a tantalum target component for a semiconductor, the formed film has relatively good quality.

The invention discloses a method for making ultrafine grained steel, comprising the steps of: heating carbon steel to a temperature of 1200-1240DEG C to carry out austenization, wherein the carbon steel contains 0.02-0.20% of carbon and 0.40-1.60% of manganese by mass fraction; controlling to roll by using an austenite recrystallization area and an austenite non-recrystallization area; performinganother deformation near an Ar3 temperature by combining the deformation induced ferrite transformation technology so as to restrain the reverse transformation from the ferrite to the austenite aftertwice transformation, accumulate mass storage energy of the second transformation, increase the nucleation points of the ferrite, and promote the increase of the volume fraction of the ferrite; and finally cooling to a temperature of 600-650DEG C at a cooling speed of 1-10DEG C / micron for air cooling. The ferrite grain dimension of the prepared ultrafine grained ferrite steel is less than 3.0 microns. The manufacturing method of the ultrafine grained steel does not need large deformation and ultrafast cooling process, and has small mill load and simple process; and the obtained room-temperature ultrafine ferrite grains are stable.

The invention relates to the technical field of welding, in particular to an amorphous smelting flux and a preparation method and application thereof. The amorphous smelting flux is prepared from the following components including, by mass percent, 20%-25% of CaF2, 30%-35% of CaO, 30%-35% of SiO2 and 5%-15% of TiO2. The amorphous smelting flux has the advantages of being free of moisture absorption, good in slag detachability, capable of effectively reducing the contents of harmful elements such as P and S in a welding seam and the like by adopting the specific components and dosages thereof. Meanwhile, the flux is in an amorphous state, the welding seam obtained after welding is uniform in composition, the mechanical property of the welding seam is excellent, and particularly the low-temperature toughness of the welding seam is good.

The invention discloses a method for improving Al0.3CoCrFeNi high-entropy alloy intensity. Five kinds of analytical pure metals of Al, Co, Cr, Fe and Ni are blended according to the atomic ratio of 0.3 to 1 to 1 to 1 to 1, smelting is carried out in a vacuum arc melting furnace, the molten alloy is subjected to suction casting to form plate-shaped high-entropy alloy materials with 2mm thickness, 10mm width and 85mm length, and then a high-entropy alloy is subjected to cold rolling and annealing heat treatment to eliminate the residual internal stress, generated in the casting process, of the high-entropy alloy; and then a wire cutting machine is used for cutting bone-shaped standard tensile samples with a standard distance of 5mm, the front faces and back faces and the two side faces of the tensile samples are polished, and the polished samples are subjected to a double-glow chromizing test by using a double-glow metal furnace, and finally, the obtained samples are strengthened high-entropy alloy samples. According to the method for improving the Al0.3CoCrFeNi high-entropy alloy intensity, through a double-glow chromizing technology, the friction coefficient of the high-entropy alloy is reduced, and the amplitude is greatly reduced.

The invention discloses a method for producing crystal maltol, which comprises the following contents: a maltol solution is evaporated and concentrated to be supersaturated to obtain a maltol massecuite; maltol crystal seeds are added to the massecuite and the supersaturation degree and viscosity of the solution are controlled; the maltol massecuite is continuously evaporated and crystallized, the solution maintains boiling and maltol solution is added to continuously; when the grain quantity in the massecuite reaches 50 percent to 90 percent, the massecuite is transferred into a homoiothermal reserve tank and stirred until the temperature thereof is reduced to 20 DEG C to 40 DEG C; and then centrifugal separation is conducted to obtain a finished product of crystal maltol. The method canimprove the crystallization efficiency of the maltol and render the grain be even and stable.

The invention relates to the field of welding technology, in particular to an amorphous melting flux and its preparation method and application. Amorphous melting flux is made of the following components in mass percent: CaF 2 20%~25%, CaO 30%~35%, SiO 2 30%~35% and TiO 2 5%~15%. The amorphous smelting flux has the advantages of no moisture absorption, good slag detachability, and effective reduction of harmful elements such as P and S in the weld by adopting specific components and dosages thereof. At the same time, the flux is in an amorphous state, and the composition of the weld seam obtained after welding is uniform, and the mechanical properties of the weld seam are excellent, especially the low temperature toughness of the weld seam is good.

The invention relates to the technical field of permanent magnet materials, in particular to a graphene rare earth permanent magnet material and a preparation method thereof. The graphene rare earth permanent magnet material comprises the following raw materials in percentage by mass: 20.6%-23.4% of neodymium, 6.6%-7.5% of praseodymium, 0.95%-1.20% of boron, 0.4%-0.6% of cobalt, 0.11%-0.15% of copper, 2.0%-2.4% of lanthanum, 1.7%-2.1% of cerium, 1%-5% of graphene and the balance of iron. The graphene rare earth permanent magnet material has good temperature resistance, conductivity and magnetic performance and does not contain terbium and dysprosium heavy rare earth elements, the cost of a rare earth permanent magnet is greatly reduced while the graphene rare earth permanent magnet material with excellent performance is obtained, effective utilization of rare earth resources is facilitated, and the product yield is increased; and the preparation method is simple in process, convenient to control, low in production cost and high in production efficiency, and the prepared product is stable in performance.

The invention provides a production method of a nickel target and a nickel target component. The production method of the nickel target comprises the following steps of providing a nickel ingot; performing hot forging on the nickel ingot to form a first nickel target blank; performing first heat treatment on the first nickel target blank to form a second nickel target blank, wherein the temperature of the first heat treatment is 450-550 DEG C, and the temperature is maintained for 1-2 hours; after the first heat treatment, performing hot rolling on the second nickel target blank to form a third nickel target blank; performing second heat treatment on the third nickel target blank to form a fourth nickel target blank, wherein the temperature of the second heat treatment is 300-500 DEG C, and the temperature is maintained for 1-2 hours; after the second heat treatment, performing cold rolling on the fourth nickel target blank to form a fifth nickel target blank; performing third heat treatment on the fifth nickel target blank to form the nickel target, wherein the temperature of the third heat treatment is 200-300 DEG C, and the temperature is maintained for 1-2 hours. By adopting the technical scheme, the produced nickel target has relatively uniform internal organization and good magnetic property.

The invention relates to the technical field of permanent magnet materials, in particular to a neodymium iron boron permanent magnet material and a preparation method thereof. The neodymium iron boronpermanent magnet material is prepared from, by mass, 21.85%-24.15% of neodymium, 0.91%-1.01% of boron, 7.5%-8.5% of praseodymium, 0.6%-0.8% of aluminum, 0.55%-0.65% of dysprosium, 0.15%-0.25% of gallium,0.13%-0.17% of copper, 0.11%-0.13% of zirconium, 1%-6% graphene and the balance iron. The preparation method of the material comprises the steps that raw materials except graphene, copper and aluminum are subject to smelting and ingot casting in advance and then are proportionally mixed with nano copper powder, nano aluminum powder and nano graphene sheets, the mixture is put in an oriented magnetic field for pressing and formation, and sintering is performed after isostatic pressing. The preparation method is simple in process, easy to control, the product performance is superior, the product quality is stable, and the prepared neodymium iron boron permanent magnet material is good in corrosivity, high in mechanical strength and good in machinability.

The invention provides a ceramic material and a preparation method and application thereof.The ceramic material is prepared from 92%-97% of aluminum oxide, 1.5%-3% of magnesium oxide, 0.5%-2% of niobium pentoxide, 0.5%-1% of yttrium oxide and 0.5%-2% of chromium sesquioxide, and the ceramic material has good density, good strength, low shrinkage rate and low dielectric constant and can be applied to packaging of electronic devices.

The invention provides an accurate heat treatment quenching technology of a powder metallurgy high-speed steel precise part and belongs to the field of heat treatment of high-speed steel materials. The accurate heat treatment quenching technology is provided for the precise part made of a high-speed steel ASSAB ASP23 material imported from Sweden and comprising the main alloy ingredients of 1.28%of C, 4.2% of Cr, 6.4% of W, 5.0% of Mo and 3.1% of V. According to the accurate heat treatment quenching technology, based on different workpiece hardness requirements, different quenching temperatures are adopted, so that a small designed hardness difference needed by two interactional precise parts can be achieved; different temperature keeping times are adopted for different workpiece thicknesses, so that the hardenability of the material is reliably guaranteed, the crystal structure in the material can be accurately controlled to be refined, uniform and stable, and the parts can be good in wear resistance, long in service life, high in reliability and stable in dimension and meets the use demands for the precise parts. The accurate heat treatment quenching technology comprises the technical scheme that (1) workpieces with the thickness difference smaller than 5 mm are placed in a quenching furnace and preheated to 150 DEG C in two steps; (2) the workpieces are heated to the quenching temperature T in three steps and keep the temperature for the time t in the quenching furnace; (3) the workpieces are discharged from the furnace and air cooled to 50-70 DEG C; (4) the workpiecesare fed into a tempering furnace to be heated to 550 DEG C for tempering and keep the temperature for the time of t three times, and then the workpieces are discharged from the tempering furnace and air cooled (please refer to the figure 1).

The invention discloses a preparation method of lithium cobalt oxide. The preparation method of the lithium cobalt oxide solves the problems that an existing preparation method of the lithium cobalt oxide is high in temperature, the lithium cobalt oxide obtained through the existing preparation method is uneven in particle, the agglomeration phenomenon exists, the high temperature process causes uneven content of cobalt and lithium in materials and leads to the lithium element to be separated out. The preparation method of the lithium cobalt oxide includes the following steps of weighting out a certain amount of lithium salt, measuring water-solubility organics based on the molar weight of the lithium salt according to the ratio that the total molar weight of the water-solubility organics is 50%-70% of the molar weight of the lithium salt, mixing the water-solubility organics and the lithium salt, adding water to mixture, conducting ball-milling, obtaining pre-reaction slurry, adding materials with cobalt and water to the pre-reaction slurry wherein the molar ratio of the lithium to the cobalt is 0.95-1.2: 1, conducting the ball-milling, obtaining reaction slurry, drying the reaction slurry, calcining the slurry, and obtaining the lithium cobalt oxide. The preparation method of the lithium cobalt oxide has the advantages that the lithium cobalt oxide obtained through the preparation method is good in evenness, small in crystal particle, even in particle size, and less in agglomeration. In addition, the preparation method of the lithium cobalt oxide has the advantages of being simple in technology process, appropriate for large batch production, low in calcination temperature and the like.

The invention relates to the field of welding wire manufacturing, in particular to a preparation method of an aluminum and aluminum alloy welding wire electrochemically plated with a Zn+Cu / Re composite coating and applied to robot welding. A pure aluminum or aluminum alloy wire rod is used as the matrix. Pretreatment, electrochemical plating of the Zn+Cu / Re composite coating and post-treatment areconducted on the surface. The electrochemically plated Zn+Cu / Re composite coating has the functions of reducing welding smoke, improving the porosity resistance of the welding wire and improving solid lubrication and meanwhile fills up pits in the surface of the welding wire matrix, and the electric conductivity and surface quality of the welding wire are improved; the bonding force and strengthof the Zn+Cu / Re composite coating are high, the aluminum or copper peeling phenomenon is avoided, the Zn+Cu / Re composite coating is high in compactness, good in rust resistance and resistant to wear,Zn can reduce welding smoke and splashes, and Re can refine plating layer crystals and reduce the void ratio; and meanwhile, molten bath stirring is enhanced, a molten bath is purified, crystals are refined, pores on the surface and on the inner portion of a welding joint are thoroughly eradicated, and the porosity resistance of the welding wire is improved.