89results about How to "Short sintering cycle" patented technology

The invention discloses a preparation method of medical porous titanium and titanium alloy, which comprises the following steps: proportionally preparing titanium powder, alloy element powder and pore forming agent powder according to needs; carrying out ball milling, mixing and mechanical pressing by a powder metallurgy blank making technique to obtain a blank; putting the blank in a thermal insulation barrel, and putting the thermal insulation barrel into a microwave sintering furnace; and after vacuumizing the furnace chamber to a vacuum degree of 0.1Pa, charging argon with the purity of 99.999% to form cyclic protection, controlling the output power of the microwave sintering furnace at 0.5-3kW, heating to the sintering temperature of 800-1200 DEG C at the heating rate of 5-40 DEG C/minute, keeping the temperature for 5-30 minutes, shutting down the microwave source, and carrying out furnace cooling to obtain the medical porous titanium and titanium alloy. The invention has the advantages of simple preparation method, short sintering period, high efficiency, low sintering temperature and low energy consumption; and the sintered porous titanium and titanium alloy have excellent mechanical properties, and can be used as alternate repair material for bones, joints, artificial radix dentis and other hard tissues.

The invention provides a method for preparing WC-Co cemented carbide through microwave sintering. The method comprises the steps of WC powder and Co powder batching and mixing, compacting and sintering, wherein in the step of sintering, compacts, SiC chips, carbon black and alumina powder are put in an alumina fiber insulating bag sleeve and then the alumina fiber insulating bag sleeve is put in a microwave high temperature furnace, the products in the furnace are heated to 500-600 DEG C at a heating speed of 5-10 DEG C/min and the heat is preserved and then the products are heated to 1400-1500 DEG C at a heating speed of 30-80 DEG C/min and the heat is preserved, thus obtaining the WC-Co cemented carbide. The method has the advantages of simple process, convenience in operation, short sintering period and low energy consumption, can replace the existing WC-Co cemented carbide processes, is used for producing the WC-Co cemented carbide by adopting the intermittent or continuous microwave sintering mode and is suitable for industrial application. The prepared WC-Co cemented carbide has excellent performances.

The invention discloses a preparation method of SiC crystal whiskers. The preparation method includes following steps: (1) preparing a precursor from a carbon source and a silicon source; and (2) pressing the precursor into chips, embedding the chips in quartz sand and performing a sintering synthetic reaction with microwave to obtain the SiC crystal whisker. In the preparation method, quick synthesis of the SiC crystal whisker is achieved in a manner of direct synthesis through the microwave by means of an excellent wave-absorption performance of carbon to obtain the SiC crystal whisker in which crystallization is excellent. In a microwave sintering method, a material is sintered on the basis of dielectric loss of the material itself. Compared with an industrially conventional heating method, the microwave sintering method can achieve volume heating, is less in pollution, is short in sintering period and is low in energy consumption. The SiC crystal whisker is uniform in size, is high in length-diameter ratio, is good in crystallization degree, is less in defect and is high in yield. The method is simple in technology, is convenient to operate, is short in production period, is low in sintering temperature and energy consumption, is less in pollution, is suitable for large-scale industrialized production and has a wide application prospect.

The invention relates to a preparation method of modified high-manganese steel base TiC steel bonded carbide. The preparation method is characterized by preparing in-situ synthesized TiC powder in a required proportion from titanium powder and graphite powder according to the atomic ratio of C to Ti, namely 0.8-1.0; preparing the raw materials including ferromolybdenum powder, ferrovanadium powder, ferrochrome powder, ferromanganese powder, ferrosilicon powder, ferrum powder, nickel powder, colloidal graphite and rare earth according to a required proportion of mass ratios of chemical components of bonding phase metals, filling steel balls, performing ball milling, adding absolute ethyl alcohol used as a medium and PVA (polyvinyl alcohol) to the steel balls, drying the slurry after ball milling, and then forming the slurry by pressing and sintering the product, thus obtaining steel bonded carbide. The preparation method has the advantages that the modified high-manganese steel base TiC steel bonded carbide is prepared by combining an in-situ reactive synthesis technology and a liquid phase sintering technology; as TiC is synthesized in situ inside a matrix through reaction in the sintering process, the reinforced particles have small sizes and do not have sharp corners on the surfaces, and the matrix is better in interface bonding and has a clean interface; the preparation method of steel bonded carbide is conductive to improving the comprehensive mechanical properties of carbide, is low in price and is simple and convenient in process.

The invention relates to a high-performance niobium oxide target material, which is prepared from the following raw materials in percentage by mass: 89-98.8% of niobium oxide powder, 0.2-1% of activator carbon powder, and 1-10% of a reductant, wherein the reductant is selected from niobium powder or tantalum powder. The invention also provides a preparation method of the niobium oxide target material. The high-performance niobium oxide target material and preparation method thereof disclosed by the invention have the following advantages that (1) the preparation method is high in efficiency: the sintering cycle of the target material is short, only 10-15 hours; and (2) the target optimal is good in performance: the density is high, and can reach more than 99.95% of the relative density; the electrical conductivity is good, and the electrical resistivity is 3*10<-3>-9*10<-3> omega.cm; the target material is uniform in compactness, and has no pit.

A preparation method of a large-size and fine-grain molybdenum tantalum alloy sputtering target material comprises steps of cold isostatic pressing molding through combination of a steel mold with a rubber plate, sintering, levelling and reshaping, hot isostatic pressing treatment, rolling and machining. The grain size of the produced target material is smaller than 50 microns, the change of the grain size is maintained within 20%, and grains are evenly distributed in the plane direction and the thickness direction of the target material; the relative density of the target material is higher than 97%; besides, the large-size sputtering target material with the length being about 2 m and the width being about 1.3 m can be produced.

The invention discloses a preparation method of a diamond/copper composite high in heat conduction performance. The preparation method comprises the following steps of 1, uniformly mixing diamond obtained after surface of the diamond is subjected to degreasing and roughening treatment with tungsten powder according to the mass ratio of 1: 4.5, heating a powder mixture under the vacuum condition, conducting heat preservation for 2-8 hours at the temperature of 1030 DEG C, and finally, separating out modified tungsten-plated diamond, wherein the vacuum degree is 10<-2>-10<-4> Pa, and the temperature rising rate is 5 DEG C/min; and 2, uniformly mixing the tungsten-plated diamond, with the mean particle size being 125 microns, obtained after surface modification with copper powder with the mean particle size being 45 microns with the total volume content of the tungsten-plated diamond accounting for 55%, sintering an obtained powder mixture, and then cooling the obtained power mixture to the room temperature, so that the diamond/copper composite is obtained, wherein the sintering parameters are that the pressing pressure is 40 MPa, the temperature is 1000 DEG C, the temperature risingrate is 100 DEG C/min, the sintering time is 10 minutes, and the atmosphere is vacuum.

The invention discloses an all-solid mixed-potential NOx sensor prepared on the basis of spark plasma sintering technology. The NOx sensor consists of an electrolyte layer, a sensing electrode layer, a reference electrode and a working electrode, wherein the multilayer composite consisting of the electrolyte layer and the sensing electrode layer is directly sintered by the spark plasma sintering technology; and the reference electrode layer and the working electrode layer, which have screen pores, are directly printed in the centers of the upper and lower surfaces of the composite by screen printing. As the NOx sensor is manufactured by the spark plasma sintering technology, the sensing electrode layer and the electrolyte layer of the sensor are well combined without problems of flying up, cracking and the like and have the characteristics of good repeatability, stable performance, simple manufacturing process, short manufacturing period, small volume, quick response and the like. The NOx sensor of the invention can detect NOx concentration ranging from 1 to 75 percent and give a response within 2 minutes and is suitable for the detection of the NOx concentration in a wide range.

The invention relates to a method for preparing W-Cu alloy in a microwave infiltration way, which comprises the following steps: 1. dispensing W powder and reduced Cu powder according to the weight percentage of W-3Cu, then ball-milling and mixing; 2. fetching the mixed powder and electrolytic copper powder according to design components, and respectively pressing the mixed powder under the pressure of 150-510MPa to form a cylindrical W framework and an infiltrated Cu pressed billet; 3. putting the pressed cylindrical W framework, the infiltrated Cu pressed billet and SiC slices into an alumina fiber heat-preserving sheath and then putting the sheath into an oven chamber of a microwave high-temperature oven, and vacuumizing the oven chamber to the vacuum degree within 100Pa by a vacuum pump; 4. injecting mixed protection gases of N2 and H2 into the oven chamber of the microwave oven, regulating the output power of the microwave high-temperature oven, heating to about 1350 DEG C at a temperature-rise speed of about 30 DEG C/min, preserving the heat, powering the microwave oven off and cooling to obtain the ideal alloy. The invention has simple process, convenient operation, short sintering period, low energy consumption and excellent performance of the obtained W-Cu alloy and can substitute for the prior process for preparing the W-Cu alloy in an infiltration way.

The invention discloses a method for synthesizing lithium ferrous phosphate in a solution, which relates to an anode material of a lithium ion battery, and the method belongs to the technical field of chemical material preparation. The method comprises the following steps: reacting phosphoric acid, iron trioxide with reduced iron powder at a certain temperature, adding a lithium source and a carbon source, continuing the reaction to obtain a mixing solution, and filtering, drying and calcining the mixing solution to obtain the lithium ferrous phosphate. Compared with a synthetic method of using the reduced iron powder as an iron source, the method adopts the iron trioxide as most of iron sources so as to reduce the cost of raw materials greatly; the obtained product is uniform in component and good in batch stability, and the synthesized lithium ferrous phosphate material serving as the anode material of the lithium ion battery has the excellent electrochemistry performance; 3C multiplying power discharging specific capacity is more than 130mAh/g at room temperature; the synthesized lithium ferrous phosphate material is suitable for being used as power lithium ion batteries; and the method has short sintering period, simple production process, less energy consumption and no pollution, such as tail gas and waste liquor, and is suitable for mass industrial production.

The invention relates to a preparing method for a high-toughness and heat resisting TiC/TiN steel bond hard alloy. The preparing method is characterized that one of TiO2 powder, TiH2 powder and Ti powder and colloidal graphite powder are prepared according to the C/Ti atomic ratio of 0.7-1.1, one of the TiO2 powder, the TiH2 powder and the Ti powder and urea ((NH2)2CO) are prepared according to the N/Ti atomic ratio of 0.4-1.1, and accordingly in-situ synthesized TiN mixed powder is prepared; ferro-molybdenum powder, ferro-vanadium powder, ferro-chromium powder, ferro-manganese powder, ferro-silicon powder, iron powder, ferro-boron powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the needed proportion for the bonding phase metal chemical component mass ratio to be arranged into a steel ball mill, absolute ethyl alcohol serving as a medium and PVA are added, after ball milling and slurry drying, pressing forming is conducted, and the steel bond alloy is obtained through sintering. The in-situ reaction synthesizing technology and the liquid phase sintering technology are combined, reinforced particles are fine in size, the surfaces are free of sharp corners, base body interface bonding is good, and the interface is clean. Through the method for preparing the steel bond alloy, the comprehensive mechanical performance of the alloy can be improved, cost is low, and the technology is easy and convenient to conduct.

A hard alloy sintering process comprises the following steps: filling moulded workpiece in a sintering chamber, starting vacuum pump to vacuumize and starting glue pump, raising temperature to 330 to 350 DEG C, making adhesive gasify, at the same time, pumping the gasified adhesive gas from sintering chamber by glue pump, and then, continuously raising temperature to 630 to 660 DEG C, making furnace-residual adhesive gas crack, after finishing degumming, continuously vacuumizing to 140 to 160 Pa and raising temperature to 1410 to 1480 DEG C, at last finishing sintering. The degumming and vacuum sintering integrated furnace of the invention comprises: a furnace, a heat preservation box, a sintering chamber, an adhesive tank, a glue pump and a vacuum pump. The invention has rational design, simple device structure, convenient operation and integration of degumming and vacuum sintering for effectively improving the product sintering quality, shortening sintering period, saving energy resource and reducing product sintering cost. The furnace is a novel product fit for replacing the current hard alloy sintering device because of wide sintering product range, low device cost and safe production process.

The invention provides a Ni-Fe-Mo-Mn porous material. The Ni-Fe-Mo-Mn porous material is prepared by the steps of accurately weighing 15 to 21 percent of ferro-molybdenum, 11 to 16 percent of ferro-manganese, 7 to 9 percent of iron powder the balance of nickel, preparing pre-alloyed powder by adopting an atomization technology and sintering in vacuum. The porous material prepared by the inventionhas abundant, uniform and controllable pores and has the advantages of large specific surface area, low hydrogen evolution overpotential, good catalytic performance, good corrosion resistance, stableworking performance, simple and environment-friendly preparation technology and the like; the preparation cost is low and the technology is simple and easy to realize. The porous material prepared bythe invention can be used as the electrolytic hydrogen evolution cathode material.

The invention discloses a method and device for sealing the end faces of a film bundle. The device for sealing the end faces of the film bundle comprises a base plate, a working part arranged on the base plate, a base and a hot plate, wherein the base and the hot plate are located on the two sides of the working part respectively. A through hole is formed in a working plate of the working part, a plurality of suction holes are formed in the edge of the circumference of the through hole and connected with an air pipe, two positioning holes are formed in the top of the base, a rail groove is formed in the bottom of the base and matched with a guide rail of the base plate, the hot plate is fixed through a hot plate base, and a driving mechanism is connected to the hot plate base. The method for sealing the end faces of the film bundle includes the step that the end faces of the hollow fiber film bundle are sealed in the mode that aluminum foil sheets are arranged on the end faces of a glue injecting cover in a hot-seal mode. Secondary glue injecting is avoided, production working procedures are reduced, the production and manufacturing cost is effectively reduced, and the complete film silk sealing effect can be played.

The invention relates to a preparation method of a prealloyed CrNiFeTiMoW high-entropy alloy porous material. The preparation method mainly comprises the steps that ultrasonically-treated Cr, Ni, Fe,Ti, Mo and W materials are weighed according to an equimolar ratio; the weighed materials are molten through vacuum arc and then are atomized to prepare prealloyed CrNiFeTiMoW high-entropy alloy; stearic acid accounting for 2-4% of the total powder content is added into the powder, and after drying, a pressed blank is obtained through cold press forming; and the pressed blank is placed in a vacuumsintering furnace to be sintered to prepare the high-entropy alloy porous material. According to the prealloyed CrNiFeTiMoW high-entropy alloy porous material prepared through the preparation method,the production process is simple and easy to implement, the sintering period is short, the preparation cost is low, the high open porosity and rich connected pores are obtained, ingredients are uniform, the structure is controllable, and the material can be used for liquid-solid or gas-solid separation conditions of corrosion resistance and high temperature oxidation resistance.

The invention discloses a ceramic material and a preparation method therefor. The ceramic material is mainly prepared from the following raw materials in percentage by mass: 40% to 50% of red mud, 20% to 30% of bauxite, 5% to 10% of potash feldspar, 5% to 10% of kaolin and 5% to 10% of quartz sand. The ceramic material disclosed by the invention is prepared by taking the red mud as a main raw material and is high in hardness, good in density and low in production cost, so that the problems, i.e., environmental pollution and floor-occupied stacking caused by aluminum mineral industry are solved, industrial wastes can be sufficiently utilized, the waste is changed into the valuable, and the economic and environmental benefits are remarkable.

The invention relates to a preparation method of high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy. The preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy is characterized in that one of TiO2 powder, TiH2 powder and Ti powder is mixed with aquadag powder with the atomic ratio of C/Ti being 0.7-1.1, and one of the TiO2 powder, the TiH2 powder and the Ti powder is mixed with carbamide ((NH2) 2CO ) with the atomic ratio of N/Ti being 0.4-1.1 and made into in-situ synthesized TiN mixed powder; ferrochromium powder, ferromolybdenum powder, ferrovanadium powder, ferrotungsten powder, ferroniobium powder, nickel powder, ferroboron powder, iron power, aquadag and rare earth raw materials are mixed according to the needed chemical component mass ratio of adhesive phase metal and placed in a steel ball mill, absolute ethyl alcohol is added and used a medium, and PVA is also added; and after ball milling, slurry is dried, and then the steel bond hard alloy is obtained through pressing forming and sintering. According to the preparation method of the high-strength-and-toughness high-wear-resistance TiC/TiN steel bond hard alloy, the in-situ reaction and synthesis technology and the liquid phase sintering technology are combined, the reinforced particles are fine in size, the surfaces of the particles are free of sharp corners, matrix interface bonding is good, and the matrix interface is clean. By the adoption of the preparation method of the steel bond hard alloy, the comprehensive mechanical performance of the prepared steel bond hard alloy can be improved, the cost is low, and the technology is simple and convenient.

The utility model provides microwave sintering of an ultra-fine grain titanium carbonitride group cermet. A 300MHz to 8GHz microwave frequency medium is used as a heat source to enable a billet of the ultra-fine grain titanium carbonitride group cermet to absorb microwave energy to complete the sintering process. During the sintering process, vacuum and atmosphere protection microwave heating and sintering techniques are adopted respectively according to the ratio of carbon to nitrogen of the billet of the ultra-fine grain carbon titanium nitride cermet. The 300MHz to 8GHz microwave frequency is used to heat and sinter the billets of the titanium carbonitride group cermet with different ratio of carbon to nitrogen and vacuum microwave sintering and atmosphere protection microwave sintering technological proposals are used respectively for the billets of the titanium carbonitride group cermet with the different ratio of carbon to nitrogen, which overcomes the defects of the prior vacuum or atmosphere protection sintering techniques, such as low heating efficiency, long sintering time, large energy consumption, serious environment pollution and oversized grains, and the like. The microwave sintering can be widely applied to sintering other ceramics, ceramic matrix composites and intermetallic compound materials with stronger microwave absorbing capacity.

The invention relates to a preparation method for high-toughness modified high-manganese steel-based TiC/TiN steel-bonded hard alloy. The preparation method is characterized in that one of Ti02 powder, TiH2 powder or Ti powder and colloidal graphite powder are prepared according to the atomic ratio being 0.7-1.1 to be in-situ synthesized TiC mixed powder; one of Ti02 powder, TiH2 powder or Ti powder and urea ((NH2)2CO) are prepared according the atomic ratio being 0.4-1.1 to be in-situ synthesized TiN mixed powder; ferromolybdenum powder, ferrovanadium powder, ferrochrome powder, ferromanganese powder, ferrosilicon powder, ferrous powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the needed proportion of the adhesive phase metal chemical composition mass ratio; steel balls are stored, and ball milling is conducted, wherein absolute ethyl alcohol is added to serve as a medium and PVA; and after ball milling is conducted, slurry is dried and then subjected to pressing forming, sintering is conducted, and the steel-bonded alloy is obtained. According to the preparation method, in-situ reaction synthetic technology and liquid phase sintering technology are combined, the fineness of particle sizes is enhanced, the surface has no sharp corners, combination of the substrate interface is good, and the interface is clean; the preparation method for the steel-boned alloy can improve the comprehensive mechanical property of the alloy, the price is low, and the technique is simple and convenient.

The invention discloses high-strength siliceous brown glaze electric porcelain and a preparation method thereof, and relates to the technical field of siliceous electric porcelain. The invention discloses a high-strength siliceous brown glaze electric porcelain, the raw materials comprise a blank material and a brown glaze material; the blank material comprises the following raw materials: kaolin, wollastonite, Jiepai mud, siliceous porcelain waste powder, low-melting-point glass powder, spodumene, yttrium oxide, ceramic-grade talcum powder and a nucleating agent; the brown glaze material is composed of the following raw materials: potassium feldspar powder, quartz powder, blank mud, calcite powder, cooked talcum powder, iron oxide, chrome green, manganese sesquioxide and Jiepai mud. The invention also discloses the preparation method of the brown glaze electric porcelain. The siliceous brown glaze electric porcelain has the advantages of simple and easily available raw materials, low cost, high bending strength, good plasticity and good stability; and the brown glaze is low in cost, short in glaze dipping time, good in glazing effect, ruddy and full in glaze surface, bright in luster, stable in color generation and free of color difference, and the strength of the brown glaze electric porcelain is improved by 10% or above compared with the strength of the brown glaze electric porcelain before glazing.