23results about How to "Short sintering time" patented technology

The invention relates to the technical field of silicon carbide ceramics, in particular to an in-situ induced low-temperature eutectic silicon carbide porous ceramic and a preparation method thereof. The material is prepared by mixing and sintering the following materials: silicon carbide, a synergistic sintering system, a dispersing agent, a plasticizer and water, wherein the synergistic sintering system comprises the following components: pregelatinized starch, a silicate mineral material, aluminum oxide, calcium carbonate, glass powder and rare earth oxide; the pregelatinized starch is adopted as an adhesive, the thermal decomposition behavior of the pregelatinized starch and the chemical reaction activity of the glass powder and the calcium carbonate form synergy in the process, seamless connection of the whole process from the room temperature to the sintering temperature is achieved, the sintering temperature is greatly reduced, meanwhile, the glue discharging step is omitted, and the silicon carbide porous ceramic product with good performance and few defects is obtained.

The application belongs to the technical field of powder metallurgy, and particularly discloses a nanoscale oxide particle dispersed aluminum-titanium target material and a preparation method and application thereof. x The nanoscale oxide particle dispersed aluminum-titanium target material has a double-layer structure, including a plated raw material layer and a base layer. x The plated raw material layer is composed of Al, Ti and MeO, wherein the mass percentage of Al and Ti accounts for 80-95%, and the mass percentage of MeO accounts for 5-20%; and the base layer is composed of Al and Ti or pure Al. The nanoscale oxide particle dispersed aluminum-titanium target material and the preparation method and application thereof have the advantages that the aluminum-titanium target material preparation process flow is simple, the production efficiency is high, the method is economic and environmentally friendly, and the method is suitable for batch production; the aluminum-titanium target material prepared by the method solves the binding problem of brittle target material, the target material has high density, meets the demand of hard alloy coating film plating, has no cracking problem in the plating process, and has high coating hardness and good wear resistance.

The application discloses water-permeable foamed ceramic and a preparation method and application thereof, and relates to the technical field of foamed ceramic preparation.The components of the foamed ceramic include the following raw materials: aggregate, alumina cement, foaming agent, powder, plant fiber, silane coupling agent, metal oxide and solvent.In the calcination process, the silane coupling agent is hydrolyzed, and the siloxane bond in the silane coupling agent tightly connects the plant fiber and the ceramic matrix together, the connection helps to form a solid ceramic structure, and meanwhile, the overall performance of the ceramic is improved.The silane coupling agent can improve the compatibility of the interface in the water-permeable foamed ceramic, strengthen the structure, and thus improve the stability and mechanical properties of the ceramic.

The invention discloses a texture preparation method for high-performance lead-free piezoelectric ceramics of bismuth ferrite-barium titanate. The general formula of the ceramic composition is as follows, where the molar fraction ratio of BiFeO3 and BaTiO3 is 2:1, x, y, t, and m all represent molar fractions, and 0 < x ≤ 0.05, 0 < y ≤ 0.05, 0 < t ≤ 0.05, 0 < m ≤ 0.05. In the sintering stage of the invention, a temperature gradient field is constructed to make the ceramic grains grow texture-directionally, and a textured piezoelectric ceramic with a piezoelectric constant d 33 reaching above 1000 pC / N at 350 °C and a T dr reaching above 350 °C is obtained. The preparation process of the invention is simple, and the prepared ceramic has excellent high-temperature performance and can be applied to the field of high-temperature piezoelectricity.

This invention belongs to the field of semiconductor device fabrication technology and discloses a method for fabricating high-temperature, high-power-density SiC power semiconductor devices. The invention has low equipment requirements: due to the short sintering time, few sintering cycles, and all planar sintering, a common hot press and heating table can be used for sintering in air, eliminating the need for expensive nitrogen-filled pressurized silver sintering furnaces. The process is simple and fast: only two sintering cycles, two welding cycles, one bonding cycle, and one potting cycle are needed to complete the fabrication of a double-sided cooled 250°C high-temperature SiC power semiconductor device, including a heat dissipation base plate and insulating potting. A low-cost solution for 250°C high-temperature applications: expensive materials such as nano-silver are used only in some key locations. Utilizing thermal diffusion characteristics, high-temperature solder is used instead of nano-silver at the heat dissipation base plate-substrate welding interface where heat flow is fully diffused. This avoids the problems of high difficulty and high material cost associated with large-area silver sintering without significantly reducing heat dissipation performance.

This invention belongs to the field of optoelectronic material preparation technology, specifically relating to a Mg-doped C12A7 translucent ceramic and its preparation method. The method includes the following steps: mixing a calcium-containing precursor, an aluminum-containing precursor, and a magnesium-containing precursor in a specific molar ratio; ball milling the mixture in anhydrous ethanol; drying and sieving to obtain (Ca... 1‑x Mg x )12A7 precursor powder; the (Ca 1‑x Mg x )12A7 precursor powder was pressed and subjected to cold isostatic pressing to obtain (Ca 1‑x Mg x )12A7 precursor block; the (Ca 1‑x Mg x The Mg-doped C12A7 precursor block is placed in an oxygen atmosphere and heated to the target sintering temperature for pressureless sintering to obtain Mg-doped C12A7 ceramic. This invention significantly simplifies the process flow, reduces the complexity and cost of preparation, and effectively achieves high densification of the ceramic.

This invention discloses a low-temperature, rapid sintering method for preparing sodium molybdenum ceramic targets. Specifically, molybdenum trioxide powder and sodium molybdate dihydrate powder are first mixed using alcohol as a medium through ball milling to obtain a sodium molybdenum slurry. The slurry is then dried, filtered, ground, and sieved to obtain sodium molybdenum powder. The sodium molybdenum powder is then wetted with ammonium molybdate solution. The wetted sodium molybdenum powder is placed in a graphite mold for pre-pressing. The pre-pressed green body is then placed in a sintering furnace along with the graphite mold and subjected to spark plasma-assisted cold sintering at 200℃~400℃ and 50 MPa high pressure to obtain a sintered target body. The sintered body is then mechanically polished and ultrasonically vibrated to obtain a semi-finished target. The semi-finished target and a copper backing plate are brazed together, and after cleaning, drying, and vacuum sealing, the sodium molybdenum ceramic target is obtained. This invention enables the rapid (5 min) sintering of high-purity, high-density sodium molybdenum ceramic targets at low temperatures.

The application belongs to the field of ceramic powder preparation, and discloses a method for in-situ preparation of high-performance TiB2-B4C composite ceramic from sapphire fine grinding waste. The method uses the waste produced in the sapphire grinding process as raw material (B4C, Al2O3 and Fe), adds TiO2 and C after alkali washing and purification, and combines with the discharge plasma sintering to in-situ prepare TiB2-B4C composite ceramic. The method not only realizes the comprehensive recovery of B4C in the sapphire fine grinding waste slurry, reduces environmental pollution, but also provides a method for in-situ preparation of TiB2-B4C composite ceramic from waste, changes waste into treasure, and realizes the secondary use of resources. In addition, the raw material cost is low, and the method has obvious economic value and environmental protection significance. The method has the advantages of short process, small pollution, simplicity and the like, and can be used for industrial production.

A method for preparing gradient cemented carbide based on differentiated ball milling and using pre-alloyed cobalt-nickel as the binder phase includes the following steps: (1) preparation of pre-alloyed cobalt-nickel binder powder; (2) preparation of surface mixed powder; (3) preparation of core mixed powder; (4) spark plasma sintering. This invention pre-alloys Co powder and Ni powder, which is beneficial for improving the compositional uniformity and distribution uniformity of the CoNi binder phase, and for ensuring stable distribution of the binder phase during sintering; differentiated ball milling of the surface layer and core layer establishes the interlayer structure basis of the gradient cemented carbide from the powder source; the gradient structure gives the surface layer higher hardness and wear resistance, and the core layer better toughness and crack resistance, achieving a unified matching of high surface hardness and high core toughness; densification is achieved by pre-pressing combined with spark plasma sintering, resulting in a gradient cemented carbide with clear layered structure characteristics and excellent comprehensive service performance.

The application discloses a tungsten / molybdenum alloy prepared by in-situ dehydrogenation and deep deoxidization of hydride and a method thereof, and particularly relates to the following steps: tungsten / molybdenum alloy powder and metal hydride are fully mixed according to a hydride addition amount of 1% to 10% of the total mass of the tungsten / molybdenum alloy powder, then the mixture is pressed into a compact, the compact is placed into a sintering furnace, vacuum in the furnace is extracted, the sintering furnace is heated for vacuum degassing, after the first removal of free oxygen and water vapor in the compact is completed, dry hydrogen is introduced into the sintering furnace and the sintering furnace is heated, under the action of negative pressure, hydrogen enters the voids in the compact, after the second removal of oxygen in the compact is completed, the sintering furnace is continuously heated in a stepwise manner and is kept warm, the temperature is increased to above the dehydrogenation temperature of the metal hydride, the third in-situ dehydrogenation and deep deoxidization of the hydride is completed, and finally the sintering furnace is cooled to obtain a low-oxygen tungsten / molybdenum alloy. The preparation method is simple, the deoxidization efficiency is high, the sintering grain can be significantly refined, the oxygen content in the alloy can be reduced, and the material performance can be improved.

The utility model discloses an ultra-high temperature lithium ion battery cathode material sintering roller kiln which comprises a kiln channel, the kiln channel is arranged in a penetrating mode from front to back, a row of horizontal roller bars are installed in the kiln channel in a rotating mode, brake bowls capable of moving front and back are arranged on the roller bars, and an inlet replacement area is arranged in front of the kiln channel. An outlet replacement area is arranged behind the kiln channel; a heating section, a constant temperature section and a cooling section are sequentially arranged in the kiln channel from front to back; according to the utility model, a negative electrode material to be sintered is placed in the brake bowl, then the brake bowl containing the negative electrode material is moved to the sintering area along the roller rod, and is heated by the silicon carbide rod in the corundum tube, so that the temperature in the sintering area is increased, and the purpose of sintering the negative electrode material in the brake bowl is achieved; and heat in the kiln channel is slowly dissipated, so that the temperature rise speed of the sintering area is increased, the sintering time of the negative electrode material is shortened, and the sintering speed of the negative electrode material is increased.

This invention discloses a method for preparing beryllium-aluminum alloy composite materials, belonging to the field of alloy composite material technology. The method includes: uniformly mixing beryllium powder with an average particle size of less than 18 μm and aluminum powder with an average particle size of less than 48 μm at a mass percentage of 56-66% and 34-44%, respectively, and then loading the mixture into a mold; placing the mold containing the mixed powder into a sintering furnace and performing vacuum pressure-activated sintering to obtain a beryllium-aluminum sintered ingot; and subsequently performing peeling and mechanical processing on the beryllium-aluminum sintered ingot. This invention's method can suppress the growth of beryllium-aluminum alloy particles, resulting in fine and uniform grains, high interfacial bonding strength, good product performance, uniform heating, rapid heating rate, low sintering temperature, short sintering time, and high production efficiency.

The invention provides a dental restoration material for 3D printing, a dental restoration and a preparation method. The dental restoration material is prepared from the following restoration raw materials in percentage by mass: 8%-16% of 1, 6-hexanediol diacrylate, 1%-5% of ethoxylated trimethylolpropane triacrylate, 9%-13% of polyethylene glycol 400, 0.2%-1% of diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide, 1%-5% of a dispersing agent and 60%-85% of glass powder. Wherein the glass powder comprises the following components in percentage by mass: 50%-80% of SiO2, 10%-20% of Li2O, 0.5%-10% of K2O, 0.5%-15% of Al2O3 and 0.2%-10% of a nucleating agent. The nucleating agent is P2O5 and / or TiO2. The mechanical strength of a dental restoration body prepared from the dental restoration body material can exceed 200MPa.

The application discloses a method for microwave sintering and resource utilization of aluminum ash, which comprises the following steps: mixing aluminum ash with part of calcium-containing raw materials (including quicklime and limestone) to obtain a ball-mixed mixture; mixing the ball-mixed mixture with the remaining calcium-containing raw materials and microwave-assisted heating materials, and then uniformly mixing, briquetting and drying to obtain briquettes; sintering the briquettes in a microwave field; and cooling and crushing the sintered product to obtain a calcium aluminate product. The method can not only obtain a high-quality calcium aluminate product, but also effectively remove salts and harmful elements such as nitrogen in the aluminum ash; harmful element fluorine is solidified into calcium fluoride in the calcium aluminate product and serves as a useful component of a steelmaking desulfurizer. The method realizes harmless and resource utilization of the hazardous waste aluminum ash, and is simple in operation and friendly to the environment.

The application belongs to the technical field of adsorptive desulfurizer, and particularly relates to a high-strength nanometer zinc oxide composite desulfurizer and a preparation method thereof. The composite desulfurizer contains the following raw materials in parts by weight: nanometer zinc oxide / activated carbon composite material 65-70 parts, filler 15-25 parts, and binder 40-50 parts. The desulfurizer prepared by the application has high mechanical strength, high sulfur capacity and high desulfurization efficiency.

The application belongs to the technical field of tungsten silicide preparation, and particularly relates to high-purity tungsten silicide and a preparation method thereof, the preparation method comprising the following steps: S1, obtaining silicon powder and nano tungsten oxide, mixing the silicon powder and the nano tungsten oxide, then performing wet grinding, washing and centrifugal separation to obtain a mixed slurry, and the medium for the wet grinding is cyclohexane; S2, placing the mixed slurry in an alumina boat with a cover to perform drying, reduction, calcination and natural cooling to obtain high-purity tungsten silicide. The application uses multiple methods to prevent the oxidation of Si and avoid the generation of silicon oxide; the high-activity tungsten powder obtained by reduction of nano tungsten oxide is used to shorten the calcination time; the sintering of the sample inside and outside is ensured; the high-temperature short-time rapid calcination makes the WSi2 powder loose and not hardened.

This invention discloses a sodium-ion battery additive, its preparation method, and its application, belonging to the field of sodium-ion battery technology. The invention first prepares a precursor using a high-temperature solid-state method. During the synthesis of the precursor, a transition metal is oxidized from a low-valence state to a high-valence state, providing a basic crystal framework for the subsequent synthesis of the sodium-ion battery additive, ensuring that no impurity phases are generated in the additive. The precursor is then used to prepare the sodium-ion battery additive, introducing Na during this process. 2 O 2 During sintering, decomposition releases oxygen, ensuring an oxidizing atmosphere inside the sealed crucible and maintaining Ni. 3+ The sodium-ion battery has a stable valence state. The sodium-ion additive prepared by this invention has a lower decomposition voltage and a higher irreversible specific capacity. Therefore, adding a small amount of sodium-ion additive to the positive electrode of a sodium-ion battery can provide more additional capacity, thereby significantly improving the energy density of the sodium-ion battery.

A method of manufacturing a glass lens disclosed in an embodiment of the present invention includes: providing a mixture by mixing glass particles, a polymer filled between the glass particles, and an additive; injection molding the mixture through a mold assembly having a lens shape; debinding the polymer from a lens-molded piece injection-molded into the lens shape; sintering the glass particles of the debound polymer-molded piece; and machining the sintered molded piece to be provided as a glass lens, wherein at least one of an object-side surface and an image-side surface of the glass lens can have an inflection point.

This application provides a phosphogypsum and its modification method, as well as a high-strength, water-resistant paper-faced gypsum board and its preparation method. The phosphogypsum modification method includes: drying the phosphogypsum to be modified to constant weight; mixing aluminum sulfate with the dried phosphogypsum, followed by microwave calcination, grinding, and aging to obtain modified anhydrous phosphogypsum. This phosphogypsum modification method can effectively reduce the content of soluble impurities in phosphogypsum, and the process is simple.

The present application provides a ternary cathode material, a method for preparing the same, a cathode plate, a secondary battery, and an electronic device. The ternary cathode material includes a ternary cathode material matrix including a doped region. The doped region includes an aluminum-rich doped region distributed within a bulk phase of the ternary cathode material matrix, and a titanium-rich doped region distributed in a surface layer of the ternary cathode material matrix.

This application provides a nuclear-grade zirconium-hafnium dissimilar metal and a spark plasma pressure sintering bonding method. The spark plasma pressure sintering bonding method can complete the sintering process in a shorter time, significantly improving production efficiency. Furthermore, this invention is prepared by spark plasma pressure sintering of a hafnium metal block, an intermediate layer premixed powder, and a zirconium metal block. It allows for precise adjustment of the raw material ratio of the intermediate layer premixed powder and precise control of the sintering process, thereby preparing a zirconium-hafnium dissimilar metal with a specific composition and microstructure. This results in a zirconium-hafnium dissimilar metal with high bonding strength, while retaining the intrinsic properties of both zirconium and hafnium metals. The combination of these two properties enables optimized control of the nuclear reaction process.

The application relates to a silver-coated copper particle, a preparation method thereof and application of the silver-coated copper particle in sintering paste, and belongs to the field of sintering materials. The application solves the problem of high sintering temperature of high-temperature solder in the prior art. The silver-coated copper particle is prepared by a multi-step chemical synthesis method, that is, silver-coated copper particle suspension is prepared first, and then a silver complex solution, a second chelating agent solution and a complexing agent solution are used to realize gradient structure evolution of the silver layer from compact to porous by controlling the release and reduction rate difference of silver ions, the surface of the silver-coated copper particle has a multi-stage pore structure, the contact resistance between particles can be effectively reduced, the sintering starting temperature can be effectively reduced, the poor oxidation performance of copper particles is solved, the silver consumption is reduced, the manufacturing cost is reduced, the ion migration path length and the electromigration life are increased, the silver-coated copper particle prepared by the application greatly meets the requirements of the electronic packaging field for new welding materials, and has remarkable social and economic benefits.

The utility model belongs to the technical field of sintering application, and particularly discloses a continuous type rapid hot pressing sintering device which is composed of an electric cylinder, an upper cross beam, an insulating gasket, a set of conductive copper bars, an automatic powder filling assembly, a middle die assembly, a gravity sensor, two sets of limiting rods, a pressing head fixing base, a lower cross beam, two sets of stand columns and the like. The sintering furnace has the beneficial effects that the sintering time can be remarkably shortened and the sintering efficiency can be improved by combining the effects of high temperature and high pressure, so that the requirement of large-scale production is met; by optimizing the heating and sintering modes, unnecessary energy loss is reduced, the overall energy consumption is reduced, and the current energy-saving and environment-friendly development trend is met; the sintering process can be ensured to be uniform and stable, so that the compactness, strength, wear resistance and other performance indexes of the product are improved; the sintering process is simplified, equipment requirements are reduced, the automation degree of a production line is improved, and the production cost is reduced.