943results about How to "Uniform grain" patented technology

The invention discloses a preparation method of a hydrocracking catalyst. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon, preparing a sodium metaaluminate alkaline solution B, and then adding the acidic mixed solution A, the alkaline solution B and CO2 to a reaction tank filled with clear water in parallel to prepare gel; and then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, filtering, drying and forming the mixture, and then washing, drying and roasting the product, thus preparing the hydrocracking catalyst. The method has the beneficial effects that a clean preparation method is adopted, so not only can the catalyst be easily formed and the strength of the catalyst be improved, but also the pore volume and specific surface area of the catalyst can be increased and the dispersity of metals in the catalyst can be improved, thus the catalyst has higher hydrocracking activity, middle oil selectivity and stability; and the catalyst prepared by the method can be used for a single-section hydrocracking process of a non-refining section or a one-section serial hydrocracking process of a refining section.

The invention discloses a processing method for a TC4 titanium alloy large-sized bar. The method comprises the following steps of: cogging and forging TC4 titanium alloy ingots for 2 to 3 heating times to obtain forging billets; 2, upsetting the forging billets repeatedly and performing drawing-out forging for 2 to 3 heating times; 3, upsetting the forging billets subjected to forging repeatedly and performing drawing-out forging for 3 to 5 heating times; and 4, performing chamfering round forging on the forging billets subjected to forging for 2 heating times to obtain the TC4 titanium alloy large-sized bar with the diameter of 200 to 400 mm and length of not less than 2,500 mm. The TC4 titanium alloy bar processed by the method has uniform and fine grains, few internal defects and high safety and accords with the domestic advanced level of the like products. In the processed TC4 titanium alloy bar, the room-temperature tensile strength is 920 to 960 MPa; the yield strength is 830 to 870 MPa; the elongation percentage is not less than 12 percent; the contraction ratio of the cross section is not less than 36 percent; flaw detection clutter reflects small signals; and the flaw detection level is high.

The invention discloses an ultrahigh-strength Al-Zn-Mg-Cu system aluminum alloy large-size flat cast ingot and a making method thereof, and belongs to the aluminum alloy making field. The flat cast ingot comprises, by mass, 2.0-2.4% of Cu, 1.95-2.5% of Mg, 5.5-9.0% of Zn, 0.08-0.15% of Zr, 0.0003-0.0015% of Be, below 0.06% of Ti, below 0.04% of Cr, below 0.10% of Mn, 0.085% or less of Si, 0.14% or less of Fe, and the balance Al and inevitable elements, wherein the content of each of the inevitable elements is lower than 0.05%, the total amount of the inevitable elements is lower than 0.15%, and a content ratio of Fe to Si is not less than 1.6. The making method disclosed in the invention improves traditional making methods, and does not need pure aluminum bottoming, and the flat cast ingot made in the invention has the advantages of large size, high strength, no cracks, and high casting success rate.

A process for preparing iron oxide red pigment from ferrous sulfate as the by-product of titanium oxide includes such steps as reducing iron scale at 50-70 deg.c, hydrolyzing for 6-10 hr, flocculating, deposition, refining heptahydrated ferrous sulfate, neutralizing with ammonia to generate crystal seeds, and neutralizing with ammonia while oxidizing with air to obtain target product. Its by-product, solution of ammonium sulfate, can be used for preparing composite fertilizer.

The invention discloses a fine-grain forging method for a large-size GH690 nickel-based alloy bar billet, and belongs to the technical field of forging. By using the composite technology of ingot billet homogenization and classified forging for preparing the GH690 nickel-based alloy bar billet, the grains of the bar billet for forging can be uniform and fine, thus meeting fine-grain structure homogeneity control requirements on final large-size alloy forgings; classified repeated upsetting-stretching cogging is performed on the basis of controlling a deformation temperature and the deformation amount of each heating number, the forgings are formed by hot upsetting by virtue of end part lubrication and horizontal restrain technologies, and rapidly cooled to eliminate grain coarsening caused by deformation heat effect, and finally, the forging structures with uniform carbides and fine grains are obtained.

The invention provides a preparation method of a polycrystalline silicon ingot. The preparation method comprises the following steps that a core source is arranged at the bottom of a crucible, and a core source layer is formed; silicon materials in a molten state are arranged on the core source layer; and the temperature in the crucible is controlled to gradually rise in a direction vertical to the upward direction form the bottom of the crucible, the temperature gradient is formed, the silicon materials in the molten state form core crystallization by utilizing the core source, and the polycrystalline silicon ingot is prepared. The invention also provides high-quality polycrystalline silicon ingot obtained by the preparation method, a polycrystalline silicon slice obtained through the preparation of the polycrystalline silicon ingot and the crucible for polycrystalline silicon ingot casting. The polycrystalline silicon ingot prepared by the preparation method has the advantages that the crystalline size is uniform and regular, the dislocation density is low, and in addition, no obvious pine-tree crystals or twin crystals exist.

The invention relates to an ultrasonic assisted laser electric arc composite welding method of an aluminum alloy. On the basis of carrying out a welding scheme by combining TIG electric arc welding and laser welding, ultrasonic vibration pressure is introduced into a welding seam, wherein a designed vibration head is in direct contact with the welding seam, so that ultrasonic resources can be more sufficiently utilized, and gas in the welding seam can be rapidly escaped; most of gas in the welding seam is removed so that welding seam gas pore defects are reduced or avoided; tissue crystal grains of the welding seam are remarkably refined by utilizing cavitation effect and acoustic streaming effect caused by the fact that ultrasonic waves are transmitted in liquid, and furthermore, tissue alloy elements of the welding seam are more uniform, segregation is reduced, the strength and corrosion resistance performance of the welding seam are improved, and the performance of a welding connector is improved; and welding residual stress is effectively eliminated or reduced and the strength and corrosion resistance performance of the connector are enhanced, so that the efficient welding of the aluminum alloy is realized.

The invention relates to the field of alloy materials, in particular to a method for preparing superhigh-purity aluminum fine grain high-orientation target, which comprises: performing uniform annealing of superhigh-purity aluminum ingots at a high temperature of 500 to 630 DEG C to eliminate casting internal stress and refine cast structure; performing multi-pass multi-directional forging of superhigh-purity aluminum ingots at 150 to 300 DEG C to obtain high-strain refined superhigh-purity aluminum grains on the premise of no change in the shape of the ingots; placing the multi-directionally forged workpiece in ice water to cool the workpiece to 0 to 5 DEG C and performing cold rolling, wherein the pass compression amount is controlled to be 5 to 30 percent, and through the inter-pass cooling by ice water of the plate, the temperature rise in the plate rolling process is controlled and the crystallization of the plate is inhibited; and performing low-temperature annealing at 50 to 250 DEG C. The method can be used to produce targets which have a thickness of 5 to 25 millimeters, an average grain size f of 200 micrometers and a (200) direction-based grain orientation, and while the targets operate at 200 DEG C, the structure of the targets is stable.

The invention discloses neodymium iron boron magnetic materials and a preparation method of the neodymium iron boron magnetic materials. The neodymium iron boron magnetic materials comprise, by weight, 27-34.5 % of neodymium (Nd), 4.5-5.75 % of praseodymium (Pr), 0.45-0.575 of gadolinium (Gd), 2-4% of boron (B), 0.08-0.16 % of niobium (Nb), 0.01-0.02 % of hafnium (Hf), 0.01-0.02 % of wolfram (W) and 0.045-0.0575 % of scandium (Sc), and the rest is ferrum (Fe). The neodymium iron boron magnetic materials have uniform textures and strong structures, and can not only improve tenacity performance of the materials but also improve magnetic performance to some extent. The preparation method of the neodymium iron boron magnetic materials fully utilizes praseodymium-neodymium waste materials to directly produce raw materials for alloy, is flexible in composition proportion, qualified in quality control, capable of reducing cost and simple in technology, and fully utilizes waste powder materials with high oxygen content.

The present invention relates to a preparation method of boron carbide ceramics. In particular, the preparation method comprises the following steps: first, boron powder and carbon powder are weighed and mixed with the molar ratio of boron and carbon equal to 0.5 to 22.5; secondly, the powder prepared in the first step is arranged in a die and transmitted to discharging plasma sintering equipment for sintering, and the temperature is raised to be between 1300 and 2200 DEG C under the vacuum conditions; thirdly, the die is taken out from the discharging plasma sintering equipment and cooled to be at the room temperature; then the die is drawn away and thus the final product is prepared. In the preparation method, the direct synthesis and densification of boron carbide are completed in one step; the powder is sintered under the vacuum conditions; and the prepared boron carbide ceramics has the advantages of high purity, variety in the ratio of boron and carbon, and high hardness.

The invention discloses a fine-crystal transparent alumina ceramic material and a preparation method. A formula of the material comprises the following constituents by weight percentage: 99.6-99.98% of Al2O3 and 0.02-0.4% of MgO, ZrO2 and La2O3. The particle size of the ceramic is at the range of 0.8 micrometer to 1.5 micrometer, and the linear light transmission at the 640-nanometer position is larger than 37%. High-purity alumina powder is used to be formed by cold isostatic compaction and sintered at hydrogen atmosphere, and temperature rises to 1,300 DEG C, then decreases to 1,150 DEG C and is preserved. By means of the method, the fine-crystal transparent alumina ceramic material is high in compactness, excellent in mechanical property, high linear transmission and suitable for ceramic metal halide lamp tubes, key components of semiconductor devices, high temperature observation and the like.

The invention discloses a preparation method of a tubular niobium target for magnetron sputtering. The method comprises the following steps of: forging a niobium casting ingot into a cylindrical niobium blank; drilling a through hole at the center of the cylindrical niobium blank to obtain a tubular niobium blank, and then uniformly coating anti-oxidization coatings on the surfaces of the inner and outer walls of the tubular niobium blank; extruding the tubular niobium blank coated with the anti-oxidization coatings to obtain a niobium tube blank; sequentially carrying out sand spraying, acid washing and machining on the niobium tube blank to obtain a semi-finished product of the tubular niobium target; and carrying out vacuum heat treatment on the semi-finished product of the tubular niobium target to obtain the tubular niobium target for the magnetron sputtering. The tubular niobium target prepared by the method disclosed by the invention has a good structure property; and crystal grains along the wall thickness direction of the target are uniform and can reach the grade of 4-6, the size of the crystal grains is not more than 100 mu m, and the re-crystallization rate of the grains is not less than 90%, so that the uniform consistency of a coating film in the magnetron sputtering is guaranteed.

The invention relates to 7XXX aluminum alloy. The 7XXX aluminum alloy comprises the following components by weight percent: 6.6 to 7.6 percent of zinc, 1.25 to 1.80 percent of magnesium, 0.18 to 0.44 percent of copper, less than or equal to 0.06 percent of silicon, less than or equal to 0.16 percent of iron, , less than or equal to 0.03 percent of manganese, less than or equal to 0.03 percent of chromium, less than or equal to 0.02 percent of germanium, less than or equal to 0.02 percent of vanadium, less than or equal to 0.03 percent of titanium, less than or equal to 0.02 percent of zirconium, and less than or equal to 0.03 percent of total weight of manganese and chromium, less than or equal to 0.03 percent of each rest impurity element, less than or equal to 0.10 percent of total weight of rest impurity elements, and the balance of aluminum. On the basis of experiment, the material strength is improved by re-designing the mass fraction and a ratio of Zn to Mg; by re-designing the mass fraction of Cu, the alloy has excellent corrosion resistance, and the oxidation different color problem of silver white can be solved. By strictly controlling the weight percent of the impurity elements such as Mn and Cr, the crystal grains of the alloy material are uniform. Compared with the existing disclosed Al-Zn alloy system, the alloy has better comprehensive performance, and an oxidized membrane formed by oxidizing the material by virtue of anode is more delicate and beautiful.

The invention relates to a manufacturing technology of a hot work die steel forge piece. The manufacturing technology comprises the steps including forging, high-temperature normalization, high-temperature tempering, ultrafine solution treatment, spheroidizing and sampling inspection. Through the procedures and related heat treatment, chemical components in the hot work die steel forge piece tendto be consistent, the structure inheritance is effectively cut off, and accordingly the purposes of refining grains and homogenizing structures are achieved. After spheroidizing, a spherical pearlitewith fine-particle-shaped carbide evenly distributed on a ferrite base body is obtained. An excellent organization structure is provided for final heat treatment.

The invention relates to a method for cast-rolling to produce aluminum substrates used in PS plates directly by electrolytic aluminum liquid; the main steps are as follows: electrolyzing the aluminum liquid under the high temperature, smelter hearth, adjusting element compositions, refining, conducting the furnace, adjusting the temperature to 740 DEG C to 750 DEG C, adding Al-Ti-B refiners to carry out the grain refinement, degassing, filtering, cast-rolling coils of strip, cool rolling, stretch bending and straightening, and producing finished products; various steps of the invention are synthesized to optimize technique parameters; the prepared aluminum substrates used in the PS plates is high in tensile strength and elongation, and the quality of the prepared aluminum substrates are better than that of similar products, thus omitting the remelting process when aluminum ingots are used, saving resources, reducing the production cost and increasing the economic and social benefits.

The invention discloses a backboard fabricating method, comprising the following steps of: providing a backboard casting piece; forging the backboard casting piece at a temperature of 800-1000 DEG C so as to form a backboard blank; and processing the backboard blank so as to form a backboard. According to the backboard fabricating method disclosed by the invention, the backboard with a finer and more uniform inner organization structure can be obtained, so that the backboard is prevented from distortion and deformation. On one hand, a deviation between each part of a target and a silicon wafer substrate is reduced, and the quality of a coating film is improved; and on the other hand, the service life of a sputtering target assembly is prolonged.

The invention relates to a preparation method of a graphite material for a continuous casting mold. The preparation method comprises the following steps: crushing, screening and burdening calcined coke, adding mid-temperature pitch, and carrying out mixing, molding, primary roasting, primary dipping, secondary roasting, secondary dipping, third roasting and graphitizing to obtain the product, wherein the particle size range and the content of the calcined coke are that the calcined coke with the particle size which is smaller than or equal to 1.0mm and greater than 0.8mm accounts for 1-2%; the calcined coke with the particle size which is smaller than or equal to 0.8mm and greater than 0.5mm accounts for 31-36%; the calcined coke with the particle size which is greater than 0.075mm and smaller than or equal to 0.5mm accounts for 28-32%; the calcined coke with the particle size which is smaller than 0.075mm accounts for 34-38%; the mixing is divided into dry blending and wet blending; the wet blending comprises the following processes: firstly heating the mid-temperature pitch to 180-230 DEG C, carrying out heat preservation and stirring for 30-60 minutes, and then adding the mid-temperature pitch to aggregate twice to knead, wherein the kneading temperature is 140-150 DEG C.

The invention relates to the field of processing and manufacturing of metal materials and particularly relates to a novel aluminum alloy and a method for manufacturing an aluminum foil with high deep-drawing performance by continuous cast-rolling. The novel aluminum alloy contains the following components in percentage by mass: 0.1-0.3% of Si, 1.0-1.5% of Fe, 0.3-0.6% of Mn, not greater than 0.05% of Ti and the balance of Al. According to the novel aluminum alloy and the method for manufacturing the aluminum foil with high deep-drawing performance by continuous cast-rolling, which are provided by the invention, cast-rolled aluminum coils are pre-processed by increasing the content of Mn and Fe in a blank and optimizing a continuous cast-rolling process, so that defects that the aluminum foil produced by the cast-rolling blank is low in plasticity and insufficient in deep-drawing performances are overcome; the produced aluminum foil can achieve and can even exceed performances of the hot-rolled blank aluminum foil, and can solve a universality problem of the fin aluminum foil and a thinning problem of the deep-drawing aluminum foil very well.

The invention discloses a process for producing a high-nodularity fastener wire rod. The process comprises the following steps: (1) selecting materials, namely selecting a steel wire with the model of SWRCH22A; (2) drawing, namely drawing the steel wire by adopting a drawing machine, wherein the compression rate is more than or equal to 50 percent; (3) performing spheroidizing annealing, namely lifting the steel wire into an atmosphere protection furnace, adding a protective atmosphere into the atmosphere protection furnace, heating the steel wire to a temperature which is 20-30 DEG C higher than the austenite transformation temperature, preserving the heat for 4-6 hours, slowly cooling to a temperature which is 20-30 DEG C lower than the austenite transformation temperature at a rate of 10 DEG C per hour, preserving the heat for 3-4 hours, and performing furnace cooling until the product is discharged out of the furnace; and (4) performing precision drawing, namely drawing the steel wire again by adopting the drawing machine, wherein the compression rate is less than or equal to 10 percent. The treated steel wire has the grain size of more than or equal to 10 grades, the grains are uniform, the nodulizing grade is more than or equal to 5, the nodulizing rate is high, the pearlite is uniform in distribution, and the wire rod does not have abnormal tissues, has high plastic deformation capacity and is suitable for subsequent plastic forming, and the wire rod with excellent size and surface is obtained.

A powder metallurgy high-entropy alloy comprises, by atomic percentage, 5-35% of iron, 5-35% of cobalt, 5-35% of chromium, 5-35% of nickel, 5-35% of manganese and 0.1-5% of nitrogen. A preparation method of the powder metallurgy high-entropy alloy includes the steps that high-entropy alloy powder is prepared, the high-entropy alloy powder is matched, after being mixed uniformly, the high-entropy alloy powder is placed in a ball mill to be subjected to ball milling, the particle shape of the high-entropy alloy powder after being subjected to ball milling is in the shape of a sphere uniform in particle size or a similar sphere, and the particle size range is 20-30 microns; and the high-entropy alloy powder after being subjected to ball milling is placed in a high-strength graphite mold to besubjected to vacuum hot pressing sintering, and finally furnace cooling is performed. The high-entropy alloy uniform in structure and fine in grain is obtained in a powder metallurgy method, and therefore the performance of the alloy is improved.

The invention provides a nickel-based high-temperature alloy bar and a preparation method thereof. The nickel-based high-temperature alloy bar comprises the following steps of S1, vacuum smelting; S2,forging; S3, hot rolling; S4, solid solution treatment; and S5, machining. On a basis of optimizing alloying element components, a relationship between strength and toughness of an alloy is coordinated, so that high strength and high toughness of the nickel-based high-temperature alloy are achieved. By adopting advanced vacuum smelting process and electroslag remelting process, the obtained alloycomponents are uniform in tissue, and a high purity precision alloy ingot is obtained. The alloy bar which is relatively high in thermoplasticity is prepared by way of hot forging, hot rolling and solid solution treatment. Compared with a conventional 718 high-temperature alloy bar, the nickel-based high-temperature alloy bar is more excellent in mechanical property, and hardness and wear resistance of the bar are improved well.

The invention provides zero trans fat acid corn oil and a refining process thereof. The appropriate processing of corn oil is achieved through the processes of alkali refining, dewaxing, decolorizing, deodorizing and packing of crude corn oil to produce the zero trans fat acid corn oil. The refining process is characterized in that the corn oil is decolorized after being dewaxed, and the decolorized corn oil is deodorized, wherein the dewaxing procedure adopts a corn oil tubular continuous dewaxing technology, and the deodorizing procedure adopts a dual-temperature and dual-tower deodorizing technology. The zero trans fat acid corn oil has the advantages that the trans fat acid content is less than or equal to 0.3%, the Vitamin E content is larger than or equal to 1,000 mg/kg, the phytosterol content is larger than or equal to 10,000 mg/kg, any chemical synthesis antioxidants and nutrition enhancers are not added, and the corn oil is more nutritious and safer and is beneficial to long-term health of people.