1445results about How to "Promote sintering" patented technology

Formulations and methods of making solar cell contacts and cells therewith are disclosed. In general, the invention provides a solar cell comprising a contact made from a mixture wherein, prior to firing, the mixture comprises at least one aluminum source, at least one source of a metal including one or more of boron, titanium, nickel, tin, gallium zinc, indium, and copper, and about 0.1 to about 10 wt % of a glass component. Within the mixture, the overall content of aluminum is about 50 wt % to about 85 wt % of the mixture, and the overall combined content of boron, nickel, tin, silver, gallium, zinc, indium, copper, is about 0.05 to about 40 wt % of the mixture.

The invention relates to a preparation method for a zirconium-based amorphous alloy as well as powder and a large-sized block of the zirconium-based amorphous alloy, which belongs to the field of amorphous alloys, and is characterized by comprising the component of Zr61(Cu, Ni)27.5Al10Re1.5(at%), wherein Re is Y, La, Ce, Nd, Gd and Er, and adopting a manner of combination of the gas atomization powder milling technology and the spark plasma sintering technology. The preparation method comprises the following steps: preparing raw materials according to components of the amorphous alloy, and placing the raw materials into an induction crucible of gas atomization powder milling equipment; vacuumizing and filling inert gas for shielding; smelting to obtain an alloy solution with uniform components under the action of induction heating; pouring the alloy solution after smelting into an insulation bag at a constant speed slowly, and filling high-pressure inert gas as an atomizing medium at the same time; atomizing the alloy solution flow into small droplets under the impact of high-pressure airflow, and finally cooling to form amorphous alloy powder; collecting and screening the amorphous alloy powder; and under the protection of the inert gas, utilizing the spark plasma sintering technology to perform sintering on the amorphous alloy powder at different temperatures and pressure to obtain an amorphous alloy block.

A method for intensifying limonite sintering has the advantage of changing the property of the moisture of the mixture by adding sucrose solution with weight concentration being 4-10%. The solution has certain viscosity which is reduced with the increase of the temperature. In the processes of mixing and granulating, the mineral powder with fine grains is well adhered to the surfaces of pellets, thus intensifying limonite granulating, improving the intensity of the pellets of the mixture and achieving the aims of intensifying limonite sintering, improving the quality of sintered minerals and reducing solid fuel consumption. The method has better effects especially on the limonite with finer grain sizes. The sucrose has the greatest characteristic of totally reacting in the process of sintering and leaving no residues in the sinter, thus having no impact on the quality of the sinter.

The invention provides a ceramic formula, comprising, by weight, 55 to 65 parts of clay, 20 to 30 parts of a flux and 15 to 23 parts of a fluxing agent, wherein the clay is a mixture of purple sandshale and china clay mixed according to a weight ratio of 0.67 to 2.0, the flux is shale, and the fluxing agent is one or more selected from the group consisting of limestone, calcite, diopside, wollastonite, dolomite, talcum and industrial waste residue. A preparation method for a ceramic product comprises the following steps: weighing the clay, the flux and the fluxing agent according to the formula, carrying out crushing and screening with a 250-mesh sieve, wherein the weight of screen residue is 1 to 1.5%, adding water, carrying out blending to obtain slurry and then carrying out drying and granulation so as to obtain powder; grading particles and then carrying out molding so as to prepare a green body; carrying out drying so as to prepare a dry body; and carrying out firing so as to prepare a seasonal ceramic body. According to the ceramic formula and the preparation method for the ceramic product in the invention, raw materials are cheap, process is simple, firing temperature is reduced, production cost is decreased, investment for production equipment is lowered down, production efficiency is improved, and energy consumption is reduced.

The invention belongs to the technical field of refractory materials, in particular to an aluminum chrome refractory material, which takes white fused corundum as a body and is formed by adding scraps (the scraps are collected and crushed into the synthetic size) generated in the cold processing process of a dense chromic oxide product, Alpha-Al2O3 powder or chrome oxide green or white fused corundum powder and sintering at a high temperature in combination with an inorganic binding agent or an organic binding agent. A product obtained in the invention can be widely applied to a coal water slurry gasification furnace back lining, a hard carbon black reaction furnace inner lining, a residual oil gasification furnace inner lining in the petrochemical industry, a glass wool molten pool inner lining and the like, fully and effectively makes use of the scraps generated in the cold processing process of the dense chromic oxide product and has the characteristics of low impurity content, high refractoriness, excellent physical performance, good thermal shock resistance and strong erosion resistance.

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 provides modified slag splashing maintenance material which can be used in multiple furnaces and a preparation method thereof. The invention is characterized in that the maintenance material comprises waste magnesium carbon bricks, complex deoxidizer (metal magnesium powder, metal aluminum powder and ferrosilicon alloy), raw materials containing TiO2, etc. The mass percentage is: 30 percent to 75 percent of MgO, 3 percent to 20 percent of total C, 2 percent to 10 percent of Al2O3, 1 percent to 10 percent of TiO2, 0.3 percent to 5 percent of Mg, 1 percent to 12 percent of Al, and the residue is SiO2. The complex deoxidizer amount obviously improves the reduction of the furnace temperature on FeO and improves the yield rate of the converter steelmaking. Specifically, nitrogen that is blown in when TiO2 and splashing slag are introduced helps to form the nitrogen titanium compound with high melting point, which improves the viscosity of the slag, enhances the adhesion force of the splashing slag material to MgO-C bricks of lining bricks of the converter and improves the maintenance effect. And the bonding strength of the splashing slag layer with the converter lining bricks is improved because of the join of TiO2. The obvious effect of the splashing slag maintenance technology is obtained that one time of the slag splashing can support 3 to 5 converters rather than just one before.

The invention provides a method for preparing a tungsten-containing alumina ceramic heating substrate, and relates to a method for preparing a ceramic heating element. The invention is capable of solving the problems of poor wettability on powder by a solvent (water), difficult defoaming on slurry, slow volatilization, long drying time, poor bonding force of ceramic and metal level after sintering during an aqueous tape-casting process. The method for preparing the tungsten-containing alumina ceramic heating substrate can substantially enhance the sintering qualification rate and production efficiency. The method comprises the following steps: preparing a premix compound and tungsten slurry, ball milling, tape-casting, screen printing, sintering and nickel plating.

The invention discloses a bismuth scandate-lead titanate high-temperature piezoelectric ceramic material. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material comprises a matrix with the chemical formula of xBiScO3-(1-x)PbTiO3 and bismuth trioxide (Bi2O3) in an amount which is less than 0.4 percent of the total weight of the matrix. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material is prepared by adding excess Bi2O3 into raw materials of Sc2O3, Bi2O3, Pb3O4 and TiO2 in the metering ratio according to the chemical formula of xBiScO3-(1-x)PbTiO3, wherein x is 0.35 to 0.38; and the using amount of the excess Bi2O3 is 0.1 to 0.4 percent of the total weight of the raw materials of Sc2O3, Bi2O3, Pb3O4 and TiO2 in the metering ratio according to the chemical formula of xBiScO3-(1-x)PbTiO3. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material solves the problems that ceramic sintering temperature is increased and piezoelectric and dielectric properties are reduced due to deviation of a stoichiometric ratio caused by bismuth volatilization in the sintering process of BSPT ceramic, and has high Curie temperature, excellent piezoelectric property and an actual application value in high-temperature electronic equipment. The invention also discloses a preparation method for the bismuth scandate-lead titanate high-temperature piezoelectric ceramic material. In the preparation method, the piezoelectric ceramic material is prepared by synthesizing and sintering at lower temperature, so production cost is reduced, process steps are simplified, and the material has actual application value.

This invention discloses a preparation method for anti-corrosion sintered NdFeB including: 1, preparing the NdFeB alloy by casting or rapid hardening rejection band strip technology then applying ball grinding or gas flow grinding to process powder after hydrogen explosion or mechanical crushing, 2, confecting oil eliminator, activated solution and chemical plating solution, 3, eliminating oil from the magnetic powder with oil eliminator then dunk rinsing with activated solution, 4, adding the powder into a plating solution for chemical-plating copper then drying it with vacuum drier, 5, pressing the dried powder to molded-blanks, 6, preparing the molded-blanks to sintered magnet in a high vacuum sintering oven.

The invention discloses a low-cost sintered neodymium boron magnet, which comprises components including, by weight percentage, 5.0-6.5% of Pr (praseodymium), 20-28% of Nd (neodymium), 3-5% of Ho (holmium), 1.0-1.1% of boron, 0.4-0.8% of Al (aluminum), 0.1-0.2 % of Zr (zirconium), 0.4-0.6% of Nb (niobium), 0.12-0.17% of Cu (copper), 0.03-0.08% of Ga (gallium), 0.4-1.0% of Co (carbon monoxide) andthe balance iron. The production method includes: pretreatment of raw materials, ingot casting and smelting, hydrogen decrepitation and pulverization, magnetic field orienting and forming, isostatic processing, sintering, ageing and detecting. In the low-cost sintered neodymium boron magnet, high-cost dysprosium of rare metal is substituted by low-cost holmium of rare metal, so that production cost of products is reduced without affecting magnetic performances of the sintered neodymium boron magnet. Furthermore, the production method is simple in operation, excellent ingot casting structure can be obtained by ingot casting and smelting process, and the high-performance sintered neodymium iron boron magnet can be obtained.

The invention relates to a photoelectric material technique, in particular to a method for controlling the grain size to produce ITO target. ITO powder is passivated under different temperatures in advance, so that the grain size of the ITO powder can be preliminarily increased and activity is reduced, the materials passivated under different temperatures are then mixed according to different proportions and ball-milled, and finally, after processes such as spray granulation, pressing and normal-pressure atmosphere sintering, the fine-grain ITO target with the grain size of 4Mu m to 10Mu m is prepared. The invention can prepare small-grain size and uniformly distributed ITO target by way of normal-pressure atmosphere sintering, the sintering temperature is decreased, and the sintering efficiency is increased; the technique is simple, the production cost is low, continuous and mass production can be easily carried out, and large-specification, high-quality ITO target can be sintered.

The invention discloses a ceramic binding agent for a ceramic grinding block and a preparation method thereof and belongs to the technical field of powder metallurgy materials. The ceramic binding agent aims at achieving the effects that the retention to diamond is good, the expansion coefficient is matched with expansion coefficients of silicon carbide, brown aluminum oxide and the diamond, and the sintering temperature of a finished product is low. The ceramic binding agent is formed by the following powder materials of, by weight, 20 to 55 kilograms of silicon dioxide, 5 to 25 kilograms of aluminum oxide, 0 to 5 kilograms of zinc oxide, 0 to 5 kilograms of titanium dioxide, 0 to 7 kilograms of zirconium oxide, 10 to 20 kilograms of sodium carbonate, 5 to 15 kilograms of lithium carbonate and 8 to 30 kilograms of boric acid. According to the ceramic binding agent for the ceramic grinding block, the ceramic grinding block has the advantages of being low in sintering temperature, good in self-sharpening, good in sharpness, long in service life, low in carbon and environmentally friendly.

The invention discloses a temperature stable type microwave dielectric ceramic Nb2VY3O12 with an ultralow dielectric constant as well as a preparation method thereof. The preparation method comprises the following steps: (1) weighing and blending original powder of Nb2O5, V2O5 and Y2O3 with the purity over 99.9% (weight percentage) according to composition of Nb2VY3O12; (2) mixing the raw material in the step (1) for 12 hours by a wet ball-mill, wherein the ball-milling medium is distilled water; and drying and pre-calcining for 6 hours in the atmosphere of 850 DEG C; and (3) adding an adhesive into the powder prepared in the step (2) and granulating, then compressing and moulding, and finally, sintering for 4 hours in the atmosphere of 910-940 DEG C; and the adhesive is a 5% polyvinyl alcohol solution, and the additive amount of polyvinyl alcohol accounts for 3% of total weight of the powder. The ceramic prepared by the invention is well sintered at 910-940 DEG C, the dielectric constant reaches 8.1-8.7, the quality factor Qf value reaches 79000-94000GHz, and the temperature coefficient of resonance frequency is small. The temperature stable type microwave dielectric ceramic Nb2VY3O12 has huge application value industrially.

The invention discloses a Fe/C composite porous structure material as well as a preparation method and application thereof. The Fe/C composite porous structure material is characterized by being prepared from low-grade sedimentary iron ore and biomass as raw materials in manners of crushing, mixing, extrusion molding and pyrolysis and reduction reaction in the presence of hydrogen atmosphere at 650-900 DEG C, wherein the main phase composition comprises biomass carbon and zero-valent iron. The Fe/C composite porous structure material disclosed by the invention is high in opening porosity, magnetic susceptibility, adsorbability and biological chemical activity, can be used for treating eutrophicated river water, living sewage and landscape water bodies, or can be used for mediation of underground water pollution and polluted soil.

The method includes steps: (1) using ingot-casting technique to manufacture Nd-Fe-B ingot-casting alloy, or using technique of rapid hardening sheet to produce rapid hardening sheet of Nd-Fe-B alloy; (2) first carrying out coarse crushing for alloy, then producing powder through airflow grinding; (3) adding powder of boron nitride or magnesia, and mixing them evenly; (4) pressure molding oriented mixed powders under magnetic field, and then carrying out cold isopressing process for blanks; (5) sintering and tempering blanks in high vacuum sintering furnace. Nd-Fe-B magnet produced according to the invention possesses better magnetic performance and corrosion resistance than magnetic performance and corrosion resistance of magnet without adding powder of boron nitride or magnesia.

The invention provides a foamed ceramic wall material with steel slag as the raw material. The foamed ceramic wall material is mainly prepared from, by weight, 22-66 parts of steel slag, 24-50 parts of aluminum-rich waste, 10-28 parts of magnesium-rich material, 6-18 parts of additional biologic material and 3-10 parts of foaming agent at low temperature through mixing, ball-milling, forming and sintering at a temperature of 1020-1250 DEG C. The prepared foamed ceramic wall material is low in production cost, waste is turned into wealth, air holes are not communicated and do not absorb water, and the foamed ceramic wall material has the advantages of being high in air hole closing rate, low in water absorption rate, high in tensile strength and the like and is a heat preservation and insulation wall material good in performance.

The invention relates to a mullite silicon carbide complex-phase fireproof material and a preparation method thereof. The mullite silicon carbide complex-phase fireproof material is characterized in that 48-60wt% of coating cladding mullite light aggregate, 9-15wt% of coating cladding silicon carbide aggregate, 6-12wt% of top-grade bauxite fine powder, 4-8wt% of andalusite fine powder, 3-5wt% of alpha-Al2O3 micro powder, 4-8wt% of Guangxi white clay, 1-3wt% of SiO2 micro powder, 4-6wt% of Si powder and 0.5-2wt% of Al powder are used as raw materials. The preparation method comprises the following steps of firstly mixing two kinds of the aggregate in the raw materials, adding a bonding agent, then performing mixed refining on the mixed aggregate, the bonding agent and other raw materials, performing material trapping, performing compression moulding, performing drying, and performing baking under the condition of 1250-1400 DEG C so as to obtain the mullite silicon carbide complex-phase fireproof material. The mullite silicon carbide complex-phase fireproof material prepared by the preparation method disclosed by the invention has the excellent characteristics of being low in heat conduction coefficients, good in erosion resistance, and high in intensity.