37results about How to "No component segregation" patented technology

The invention belongs to the field of inorganic materials, particularly relates to a thermal protection coating with component gradient change and a preparation method. The thermal protection coating comprises two components of M1 and M2, wherein the M1 is selected from one of YSZ, lanthanum aluminate, mulite or BSAS, the M2 is selected from one of Ln2Zr2O7, Ln2Ce2O7, Ln2SiO5, Ln2Si2O7 or MoSi2, and Ln is selected from rare earth elements the atom coefficients of which are 57-71, Y or Sc. The thermal protection coating has the characteristics of good coating compactness, high bonding strength with a substrate, low thermal conductivity and the like and has favorable thermal shock resistance.

The invention discloses a preparation method of spherical nickel-rhenium alloy powder. The preparation method comprises the following steps that dissolving and mixing are carried out; reducing is carried out after atomizing or dynamic drying is carried out, and precursor powder is obtained; and reducing, slurry preparation, spray granulation and balling forming are carried out. According to the aim, the preparation method of the spherical nickel-rhenium alloy powder is provided, the problems that an existing low-rhenium alloy is uneven in ingredient, rhenium-containing elements can hardly be introduced into a base material, multicomponent ingredient controllability is poor, and the preparation process is complex are solved, a balling process is creatively used two times, and the spherical powder is obtained well and fast in a saving manner. The powder obtained through the method can be directly applied to wear-resisting anti-corrosive coatings, thermal spraying, 3D printing and powder metallurgy parts, and powder raw materials do not need to be additionally matched.

The invention relates to a preparation method for tin-coated copper composite powder. The composite powder comprises primary particles and secondary particles, wherein the primary particles mainly comprise copper powder; and the secondary particles mainly comprise small particle tin powder. The preparation method comprises the steps as follows: weighing a certain amount of the copper powder and the tin powder respectively; placing the weighed powder in a ball mill, and preprocessing for a period of time to prepare sheet powder; annealing the preprocessed powder under a protective atmosphere; and adding the annealed powder into spheroidizing equipment, and compounding and spheroidizing to prepare the tin-coated copper composite powder. According to the tin-coated copper composite powder, the copper powder can be uniformly coated with tin, the particle size of the powder is uniform, and the flowability is good. The preparation process is simple, the cost is lower, and the prepared oil bearing powder is good in flowability and easy to press.

The invention discloses a preparation method of a molybdenum titanium alloy material with high density, large size and high homogeneity. The method comprises the following steps: 1) adding a solvent and a binder to Mo powder and Ti powder and grinding into slurry; 2) atomizing and pelletizing the slurry by using a spraying machine, wherein the inlet temperature is 250-300 DEG C, and the rotating speed of a spray nozzle is 8000-12000rpm, so as to obtain Mo-Ti composite powder; pressing the composite powder into blanks with regular sizes; 3) loading a plurality of blanks into a sheath, filling the Mo-Ti composite powder of 50-250 microns into the adjacent blanks to form a uniform composite powder layer, wherein the thickness of the composite powder layer is 0.5-1mm, and the condition that a gap between the inner wall of the sheath at any side and the outer wall of the adjacent blank is smaller than or equal to 0.5mm is ensured; and 4) welding and degassing the sheath and then carrying out hot isostatic pressing treatment at 750-900 DEG C and 120-160MPa and removing the sheath, wherein the heat-preserving and pressure-maintaining time is 4-6 hours. The target material fabricated by the method can be used as a cathode material of a magnetron sputtering technique.

The invention discloses a preparation method of a high-strength and high-toughness multi-element Al-Cu alloy. The preparation method comprises the following steps: raw materials is heated into a molten state, spray forming process is carried out through spray forming equipment, so that the multi-element Al-Cu alloy is formed, and the multi-element Al-Cu alloy is composed of Al, Cu, Mn, Ni, V, Sc, impurity Si and Fe. According to the preparation method, the high-strength and high-toughness multi-element Al-Cu alloy material for a lightweight cartridge case is prepared through the proportion of the raw material components, based on the micro-alloying component design of a Al-Cu alloy system and by combining 3d spraying forming-rapid solidification technology; the high-strength high-toughness multi-element Al-Cu alloy material has the advantages that crystal grains are fine, the structure is uniform, and the high-strength and high-toughness performance is achieved; according to the structure and the performance of the multi-element Al-Cu alloy, a reasonable cartridge case preparation technology is selected so that the use requirements of various lightweight cartridge cases can be met, and the Al-Cu alloy material can also be applied to a shell and a launching component of a short-range, medium-range and even a remote missile; and the Al-Cu alloy material has huge economic benefits.

The invention relates to the technical field of metal injection forming, and particularly relates to a method for preparing a high-temperature alloy honeycomb insulation board based on injection forming. The method comprises the steps of S1, preparation of mother alloy powder, S2, feeding and pelleting, S3, injection forming, S4, degreasing, S5, sintering, S6, hot isostatic pressing, S7, solid solution and aging treatment and other steps. By adopting the method for preparing the high-temperature alloy honeycomb insulation board, the defects that traditional brazing processes are complex in machining process, high in manufacturing cost and low in size precision can be effectively overcome, and the comprehensive mechanical properties of the prepared high-temperature alloy honeycomb insulation board are better than those of honeycomb boards prepared through brazing methods.

The invention provides a method for improving strength of soldered seams on the basis of thin-melt ultrasonic fine crystallization treatment in narrow gaps, and relates to the technical field of material welding. The invention aims at solving the problems that for an existing soldering connection method, due to the fact that the welding cycle is long and the welding temperature is high, soldered seam metal is large in crystal size and nonuniform in texture, and the soldered seams are low in strength. The method comprises the steps that 1, soldering materials and parent metal are assembled into a to-be-soldered part, and parent metal lapping gaps are adjusted and controlled; 2, preliminary soldering is conducted; and 3, thin-melt ultrasonic fine crystallization treatment is conducted. After soldering is conducted through the method, the crystal size of the soldered seams is obviously refined, and toughness of the soldered seams is greatly improved. According to the method, the technology is simple, the operation cost is low, fine crystal strengthening of the soldered seams of aluminum-alloy, copper-alloy, magnesium-alloy and aluminum-matrix composite materials and ceramic and ceramic-matrix composite materials can be achieved, and the method can be used for the engineering application field of complex structural components.

The invention provides a preparation method of a high-strength iron-cobalt-nickel alloy and relates to the field of preparation of a high-strength alloy material. The preparation method comprises thesteps of firstly, weighing iron powder, cobalt powder and nickel powder according to a certain mass ratio; secondly, mixing the above powder and conducting ball milling under inert gas shielding to realize alloying; thirdly, conducting sintering molding on the alloyed powder through spark plasma sintering or hot isostatic sintering and conducting hot rolling or hot extrusion on sintered samples; and finally, removing stress through heat treatment and homogenizing the structure to obtain the high-strength iron-cobalt-nickel alloy. The iron-cobalt-nickel alloy prepared through the method is uniform in structure, has the average grain diameter being about 300 nm and the strength higher than 700 Mpa and is superior to an iron-cobalt-nickel alloy prepared through a smelting method.

The invention provides a preparation method of a Ti-25Nb alloy sheet, which comprises the following steps: 1. carrying out vacuum consumable arc-melting on raw materials sponge titanium and Ti-47Nb interalloy to obtain a Ti-25Nb alloy cast ingot; 2. carrying out cogging and forging; 3. forging a sheet blank; 4. carrying out hot rolling; 5. sequentially carrying out quenching, shot blasting and pickling treatment; and 6. carrying out cold rolling to obtain the Ti-25Nb alloy sheet of which the thickness is 0.3-1mm. The Ti-25Nb alloy sheet prepared by the method provided by the invention has the advantages of no inclusion, no composition segregation, more uniform structural composition, high flatness, smooth surface and no defects, such as cracking, peeling, stratifying, folding and the like.

The invention discloses a preparation method for smelting a copper-titanium series alloy material by adopting vacuum self-consuming electric arc, and relates to the technical field of copper-titanium alloy preparation. The preparation method comprises the following steps of, S1, raw material proportioning, specifically, the material comprises the following components of, in percentage by mass: 0.5-99.5% of copper powder and 99.5-0.5% of sponge titanium; s2, mixing the raw materials, specifically, weighing the required raw materials according to the proportion, and mixing the raw materials in a mixer; s3, pressing, specifically, putting the mixture into a mold for powder upsetting, and putting the mold subjected to powder upsetting into a cold isostatic press for blank pressing; s4, sintering: putting the pressed green body into a vacuum sintering furnace for sintering; and S5, smelting, specifically, taking the sintered blank as a consumable electrode to be loaded into a vacuum consumable electric arc smelting furnace to be smelted. The alloy material prepared through the method has the advantages of being low in gas content, few in inclusion, uniform in structure and free of copper, titanium enrichment and other microdefects.

The invention discloses a preparation method of prealloying powder, which belongs to the technical field of prealloying power preparation. The method comprises the following steps of: uniformly mixing powder comprising two or more than two components; applying a current; taking powder as a heating element, and heating the powder; bonding the powder with different components; preparing to be massive prealloying power; crushing and sieving; and preparing to be the prealloying powder. According to the method, the powder is used as a heating element to be heated directly, so that the heat efficiency is greatly improved, compared with a high temperature furnace, the diffusion technology is reduced by 5-70 percent, and the production efficiency is high.

The invention relates to a Ni-Cr-based alloy welding wire and a preparation method thereof. The welding wire consists of the following components in percentage by weight: 30-80wt% of Ni, 5-40wt% of Cr, one or more of 0-35wt% of Al, Cu, Fe, Mn, Co, Ti, Zr and Hf and one or two or three of 0-8wt% of B, C and O. The welding wire preparation process comprises the following steps: mixing, link blank extrusion-forming and degreasing-sintering, wherein the diameter of the extruded welding wire is smaller than or equal to 2 mm. The prepared alloy welding wire is great in component range, and is suitable for multi-variety small-batch production. Compared with a wire obtained by a conventional drawing method, the prepared alloy welding wire is better in structure component consistency, is free of component segregation, is free of processing hardening, is high in yield, has a welding melting point lower than that of a welding wire produced by a drawing method by 100-200 DEG C, is high in weldingstrength; and after being polished, a welding seam is attractive and uniform, and is good in associativity with a base material.

The invention discloses a preparation method of a copper-niobium superconducting composite material. The method comprises the following steps that (1), copper powder and niobium powder are uniformly mixed; (2), the uniformly mixed copper-niobium powder is poured into a mold, then a copper-niobium consumable electrode bar is pressed on a press machine; (3) the pressed copper-niobium consumable electrode bar is loaded into a vacuum sintering furnace, sintering is carried out, a copper-niobium consumable electrode is obtained; and (4) the copper-niobium consumable electrode is welded on an auxiliary electrode in protective gas, smelting in a vacuum arc furnace is carried out, and the copper-niobium superconducting composite material is obtained. According to the preparation method of the copper-niobium superconducting composite material, the copper-niobium superconducting composite material is uniform in component, free of the component segregation phenomenon and free of generated inclusions.

The invention provides a comprehensive utilization method of powder by-products generated in the spray forming process. The method comprises the steps that powder by-products are pressed, formed and sintered directly; the powder by-products mainly from extra powder generated in the spray forming green part preparation process, and are named as powder by-products in order to differ from a spray forming green part; according to the pressing forming, a hydraulic single column press or a four-column hydraulic press is adopted for loading the powder by-products into a steel mold to be formed, and agreen body is prepared; according to sintering, a vacuum hot pressing furnace is adopted for performing sintering densification, an alloy is prepared, and therefore the powder by-products are comprehensively utilized. According to the comprehensive utilization method of powder by-products generated in the spray forming process, the preparation technological process is short, the cost is low, operation is easy, convenient and flexible, the prepared materials have the structure and performance advantages of being fine in grain, uniform in structure, free of segregation and high in strength. Themethod can effectively achieve comprehensive utilization of powder by-products, the material utilization rate is increased, and the certain economic benefits are obtained.

The invention discloses a preparation method of a high-silicon aluminum alloy for a burner. The silicon carbide aluminum alloy and solid silicon are mixed in proportion by weight, and the silicon carbide aluminum alloy is 10-20%, of which silicon carbide is about 50-70%, and aluminum is about 30%. ~50%; solid silicon 80-90%, and then put the mixture in a medium frequency induction furnace for remelting. After remelting is completed, silicon carbide is dissolved in the lower part of the silicon liquid, aluminum is dissolved in the upper part, and then the bottom and upper solutions are separated. Add copper, aluminum titanium, aluminum manganese, aluminum nickel, magnesium, iron, zinc, bismuth and other alloying elements to the obtained aluminum and silicon liquid mixture, then refine, remove slag, and cast to prepare high silicon aluminum alloy.

The invention discloses a method for preparing pliers of butted cutting edges, comprising the following steps: (1) preparing an all-in-one mould of the butted cutting edges, wherein the mould comprises the left mould cavity of cutting edge and the right cavity of cutting edge which are opposite to each other, and the wedge-shaped ends of the mould cavities of cutting edges are opposite to each other, and a connecting part of mould cavity is installed between the mould cavities of cutting edges; (2) loading the mould obtained in step (1) into the metal powder injection molding machine, and preparing an integration of butted cutting edges and connecting part by injecting and forming in metal powder, degreasing, sintering and heat treating, wherein the integration of butted cutting edges comprises a left cutting edge and a right cutting edge which are opposite to each other, and the connecting part is used for connecting the two end faces of the wedge-shaped ends of the cutting edges; (3) mounting the integration of butted cutting edges obtained in step (2) on the pliers so as to prepare the blank of pliers; (4) removing the connecting part of the integration of butted cutting edges in the blank of pliers which is obtained in step (3) by grinding wheel so as to prepare the pliers of butted cutting edges. The pliers of butted cutting edges prepared by the invention have good property, sharpness and durability and high finished product ratio, and the pliers are not easy to misplace.