60results about How to "Short milling time" patented technology

The invention relates to a method for preparing a carbon nanotube reinforced aluminum-based composite material and belongs to a technique for preparing aluminum-based composite materials. The method comprises: preparing composite powder in which carbon nanotubes are uniformly distributed on the surface of aluminum powder by using cobalt as a catalyst and by using a chemical vapor deposition process; allowing the carbon nanotubes to reach deep parts of the aluminum powder substrate by using a ball milling process; densifying the composite powder by a pressing and sintering process or hot pressing process to obtain a blocky material; and obtaining the carbon nanotube reinforced aluminum-based composite material through hot extrusion forming. The method has the advantages that: the aluminum particle bridging function of carbon nanotubes is fully played, and the interface combination between carbon nanotubes and the aluminum substrate is strengthened; and the ball milling time is relatively short, so the damage to the structure of carbon nanotubes in a ball milling process is avoided. The composite material prepared by the method has a much higher mechanical property than that of pure aluminum substrate and thus, has a bright industrial application prospect.

The invention discloses a method for preparing nano particle reinforced aluminum matrix composites. The method comprises the steps that firstly, mixed powder of nano ceramic powder and micron-sized aluminum or aluminum alloy powder is used for preparing millimeter-sized composite particles through a dry high-energy ball mill under the protection of vacuum or argon, wherein the volume fraction of nano ceramic particles in the millimeter-sized composite particles is 10-50%; and secondly, the millimeter-sized composite particles are melted directly or added into aluminum or aluminum melt, and supersonic vibration is applied, so that the nano ceramic particles are promoted to be uniformly dispersed in the metal melt, and the nano particle reinforced aluminum matrix composites are prepared. According to the method for preparing the nano particle reinforced aluminum matrix composites, the millimeter-sized composite particles prepared through a dry milling method can be added into the metal melt easily and completely, the problems that the wettability between the nano ceramic particles and matrix metal is poor, and adding of the particles is difficult are solved, and the advantage of low cost of a casting method for preparing metal matrix composites is given to play; the nano particles in the prepared composites are distributed uniformly, and the material performance is high.

The invention relates to preparation of an electric contact material and provides a preparation method of a novel Ag-based lanthanum stannate composite electric contact material. The preparation method comprises carrying out ball-mill mixing on Ag powder and lanthanum stannate nanometer powder to obtain AgLa2Sn2O7 composite powder, carrying out hot pressing sintering treatment to obtain an AgLa2Sn2O7 blank block, and carrying out hot extrusion treatment to obtain an AgLa2Sn2O7 wire rod. The preparation method utilizes a simple AgLa2Sn2O7 composite powder synthesis technology, utilizes a ball milling technology to realize synthesis and has a low cost. Compared with AgSnO2, the AgLa2Sn2O7 wire rod has lower specific resistance, higher elongation percentage after annealing fracture, good tensile strength, excellent mechanical properties and better welding resistance.

The invention belongs to the technical field of graphene preparation and relates to a method for preparing single-layer graphene through a mechanical method. A specific technological process of the method comprises three steps of a hydroxylation process, a decontaminating process and a reduction process. The edge of natural flake graphite is processed in a carboxylation mode through a ball milling method to obtain initial carboxylation graphene powder, then pure carboxylation graphene powder with small iron content is obtained through the decontaminating process, and high-quality single-layer graphene is obtained through the thermal reduction process. The method avoids any strong oxidant and has high carboxylation degree, short ball milling time and high success rate; the decontaminating process is simple and effective; the reduction process avoids using reducing agents and is environmentally friendly; a main structure of a ball milling tank related to the hydroxylation process comprises a pressure meter, a gas exhaust valve, a tank body, a sealing cover and a stainless steel ball. The method has high preparation success rate, large yield, no pollution and low energy consumption and can achieve large-scale mechanical production through amplifying ball milling equipment.

A process for preparing superfine starch from ordinary starch features HF vibration type ball grinding at-20- -1 deg.C for 2-30 hr. The weight ratio of starch to grinding balls or rods is 1:(3-20).

The invention relates to a method for preparing a nanometer SiC composite Mg-Si-Sn-based thermoelectric material. The method comprises the following steps: first, melting Mg, Si and Sn block materials into cast ingots by using induction melting equipment, then putting the weighed nanometer SiC powder and the crushed cast ingots into a ball milling jar, and carrying out primary ball milling in argon atmosphere by adopting mechanical ball milling equipment; then, putting a graphite mould loading the primary ball-milled powder in a discharge plasma sintering chamber, and sintering into blocks in vacuum atmosphere; crushing the sintered blocks, carrying out secondary ball milling in the argon atmosphere, then sintering in the vacuum atmosphere, and thus obtaining highly-dense Mg2Si1-xSnx/SiCy(x is more than or equal to 0 and less than or equal to 1.0; y is less than or equal to 0.05) blocks. The method has the advantages of being low in cost, wide in range of applicable components, easy to operate and good in reliability, can realize dispersive distribution of nanometer SiC particles in a Mg2Si1-xSnx matrix, and meanwhile can refine the matrix grain size and improve the density and machinability of the materials.

The invention discloses a preparation method of high-coercivity manganese gallium magnetic powder, and belongs to the technical field of a magnetic material. The method for preparing the high-coercivity manganese gallium magnetic powder by a mode of introducing micro strain comprises the steps of obtaining a Mn<x>Ga alloy ingot through a suspension smelting technology firstly; performing annealingat a temperature of 400-650 DEG C for 1-10 days to obtain a tetragonal phase; performing rough crushing and sieving and then putting into a ball mill tank prepared from stainless steel; by adopting gasoline as a medium and by combination with a low-energy ball milling method, performing ball milling for 0-3.5h to obtain the high-coercivity manganese gallium magnetic powder, wherein the micro strain is 0.3-1.0 based on different ingredients and processing technologies. By virtue of rough smashing and by combination with the low-energy ball milling method, the manganese gallium magnetic powderis prepared, so that the problem of phase change caused by overhigh ball milling energy can be avoided; and meanwhile, a phenomenon of induced magnetic anisotropy and high coercivity induced by the stress is observed, so that a new means is provided for magnetic hardening of the manganese gallium permanent magnetic material.

The invention discloses an efficient rice milling machine. The machine comprises a case, a fixing base is fixedly connected to the top of the case through bolts, and a conveying pipe is fixedly connected to the top of the fixing base through bolts; a coupler is arranged in the conveying pipe, a spiral rod is fixedly connected to one side of the coupler through a fixing groove, and sliding groovesare formed in the portions, located at the two sides of the fixing groove, of the coupler. According to the efficient rice milling machine, through arrangement of the coupler, the sliding grooves, limit rods, springs and a clamping groove, when the spiral rod is installed, the limit rods and the spiral rod are aligned with the sliding grooves and the fixing groove in the coupler respectively, thenthe spiral rod is pushed, and the spiral rod drives the limit rods to slide in the sliding grooves during movement; meanwhile, by compressing the springs in the grooves through compression of press blocks, when the spiral rod cannot be pushed, the limit rods just reach the corners of the L-shaped sliding grooves, at this moment, the spiral rod is pressed and rotated, and the limit rods enter thehorizontal-movement portions from the corners of the sliding grooves.

The invention discloses a preparation method of phosphate luminescent material, which is used for preparing monometallic cation phosphate and single-phase polymetallic cation phosphate. In a liquid phase system containing water, the raw materials comprise substance which contains PO4<3-> and can be dissolved into acid or water, and substance which contains corresponding metallic cation, can be dissolved into acid or water and directly reacts with PO4<3-> to generate water-fast phosphate precipitate. The raw materials and the pH value regulator are mixed to be dissolved into acid and water to obtain settled solution. Urea is heated and decomposed to evenly release OH<-> to cause the pH value of the solution to rise, and meanwhile, the phosphate which is not dissolved in the liquid phase system is generated. The final product is obtained by washing, drying, ball milling and high-temperature calcining. The invention has the advantages of simple technology, short flow, easy control, low cost, low calcination temperature, even particle size distribution, good fluorescence performance and the like.

The synthesis process of Ti2SnC powder includes the following steps: ball milling C powder in a ball mill of vacuum degree lower than 1 Pa, rotation speed of 150-300 rpm and with agate balls and material/ball ratio of 10-100 for 4-15 hr to obtain sub-micron or nanometer level superfine C powder; compounding superfine C powder, Ti powder and Sn powder in the molar ratio of 0.7-1 to 2 to 0.8-1.2 and mixing in a mixing machine for 5-10 hr; pressing the mixture at 50-100 MPa pressure the form lumps; and high temperature roasting in a furnace under vacuum or Ar atmosphere in the temperature raising rate of 10-40deg.c/min to 550-850deg.c and maintaining for 5-30 min. The synthesis process has short synthesis period, low temperature, wide temperature range and low cost, and is suitable for industrial production.

The invention belongs to the technical field of metallurgy materials, and particularly relates to a preparation technology of a molybdenum-niobium alloy sputtering target material. The preparation technology comprises the steps of milling, molding, vacuum sintering, machining, and the like, wherein the milling process comprises the steps of putting molybdenum powder and columbium powder into a ball mill according to the principle that the ratio of molybdenum powder to columbium powder is (6 to 10) to 1; then, adding a process control agent and zirconia grinding balls; carrying out ball milling under argon protection; sieving; and separating to obtain molybdenum-niobium alloy composite powder; weights of the process control agent and the zirconia grinding balls are respectively (0.01 to 0.05) times and (5 to 20) times the total weight of molybdenum powder and columbium powder; and the process control agent is one or more of zinc stearate, palmitic acid, ethyl stearate, polyvinyl alcohol and stearic acid. According to the preparation technology, the obtained molybdenum-niobium alloy sputtering target material is a single phase structure, the structure is uniform and free of holes, the average grain size is 40 to 65 [mu]m, the density is 9.85 g/cm<3> or above, the performance is excellent, and the molybdenum-niobium alloy sputtering target material can be widely applied to the fields such as flat displays.

The invention belongs to the technical field of semiconductor manufacturing, and particularly relates to hole-filling printing paste for HTCC and a preparation method of the hole-filling printing paste. The pore-filling printing paste is composed of the following raw materials in parts by weight: 75-85 parts of metal powder, 9-12 parts of an inorganic additive and 8-10 parts of an organic carrier, the metal powder is tungsten powder or mixed powder composed of tungsten powder and molybdenum powder, and the inorganic additive is composed of aluminum oxide and silicon dioxide according to the weight part ratio of (7-10): (1-3). The organic carrier is composed of a solvent, a slurry auxiliary agent and a binder according to a weight part ratio of (6-10): (0.03-0.06): (0.5-2). Through selection of the types and proportions of the raw materials, good flatness after slurry hole filling and sintering is realized, downstream processing procedures are not affected, and the yield is high.

The invention belongs to the technical field of ceramic materials, and provides a novel iron-manganese heat resistant cooker and a production technology thereof. A low expansion coefficient raw material such as spodumene is not required in the formula of the product; the heat conductivity coefficient of the ceramic ware is greatly improved by improving the heat conductivity coefficient and the thermal shock resistance of ceramic; the sintering temperature is low, and the maturing temperature is wide in range and is 1,160 to 1,230 DEG C; the product is high in superior quality, can be quickly sintered, can tolerate the heat exchange of 500 to 20 DEG C without cracking, has the advantages of low energy consumption, high heat conductivity, high impact strength, thermal shock resistance and the like, and can be used for directly steaming, boiling, stewing and stir-frying food over a heat source; and the cooker keeps the cooking flavor of the conventional ceramic ware, does not decompose nutritional components in the food, and is an ideal multifunctional cooking ware for modern families, hotels and restaurants.