159results about How to "Fast sintering speed" patented technology

The present invention is directed to three-dimensional printing techniques, methodologies, systems and apparatus to facilitate increased print speed. Through the use of multiple nozzles on a print head printing line by line, more material is deposited. By including nozzles sufficient for a line dimensional (or portion) of a page or planar element of an object design, the material deposition for an entire plane or layer is done line by line in one pass of the print head. Likewise, through the inclusion of multiple lasers, beams or energy sources more material can be cured, such as all along a contour line, instead of point by point.

The invention discloses a gunning mix for a converter, which comprises the following components in percentage by weight: 40 to 60 percent of forsterite of which the particle size is between 0.1 and 5 millimeters, 10 to 30 percent of dolomite of which the particle size is between 0.1 and 3 millimeters, 10 to 20 percent of sintered mid-range magnesia of which the particle size is between 0.01 and 0.088 millimeter, 0.5 to 5 percent of burning and coagulation accelerator, and 1 to 5 percent of bonding agent. When applied to the converter, the forsterite gunning mix prepared by adopting the formulation has the advantages of high adhesive rate, good spalling resistance, quick sintering, erosion resistance, scouring resistance and small high temperature expansion, and simultaneously is insusceptible to gun blockage during the construction. Besides, gunning mix has abundant available mineral products with low price so as to play a role of saving important energy resources, has no influence on the quality of molten steel in use, and is free from causing pollution to the environment.

The invention provides a mixing method for sintering production. The mixing method comprises the following steps that 1, iron ore powder, solvent and fuel are conveyed into a strong mixing machine, water is added, and mixing of the first stage is carried out; 2, the material obtained after mixing of the first stage is conveyed into a first cylinder mixing machine, water is added, and mixing of the second stage is carried out; 3, the material obtained after mixing of the second stage is conveyed into a second cylinder mixing machine or a cylinder pelletizer, water is added, mixing of the third stage is carried out, and a mixed material is obtained. By the adoption of the vertical strong mixing machine, the occupied area can be reduced, moreover, the sintering strength of sintered ore can be improved, the yield of the sintered ore is increased, energy is saved, emission is reduced, and multiple advantages are brought to increase of profits of sintering factories.

The invention relates to a method for reinforcing the sintering of iron ores (vanadic titanomagnetite, specularite, secondary iron-containing resources and the like) difficult to pelletize by biomass fuel. By applying the biomass fuel with high burning velocity to the sintering of the iron ores difficult to pelletize, the sintering speed and the utilization coefficient can be improved. The reinforcing method comprises the following steps of: adding 1 to 4 percent of biomass fuel into a sinter mixture containing the iron ores difficult to pelletize, wherein the biomass fuel is required to have 65 to 85 percent of content of fixed carbon, 10 to 25 percent of volatile matter, more than 24 to 30MJ/kg of calorific value, 40 to 60 percent of porosity, 10 to 100m2/g of specific surface area and 1 to 4mm of average particle size; after weighing the iron ores difficult to pelletize, a flux, sintering return fines and the biomass fuel according to the weight ratio, sufficiently mixing the raw materials and pelletizing; distributing the mixture, igniting and sintering to obtain agglomerates. After the biomass fuel is adopted to reinforce the sintering of the iron ores difficult to pelletize, the sintering speed can be improved by 2 to 5mm/min, the utilization coefficient can be improved by 0.2 to 0.4t/(m2.h) and meanwhile, low intensity variation of an agglomerate revolving drum is ensured.

The invention discloses a sintering and synthesizing method of negative thermal expansion material Zr2P2MO12, belonging to the field of inorganic nonmetallic materials. The negative thermal expansion material has a molecular formula as follows: Zr2P2MO12, wherein M is W or Mo. The method is characterized by comprising the following steps: taking materials based on that a mole ratio of ZrO2 to WO3 to P2O5 or ZrO2 to MoO3 toP2O5 of 2:(1-1.2): (1-1.2), grinding and evenly mixing, and directly sintering the mixed raw materials or sintering the mixed raw materials after tabletting. The invention uses the high temperature rapid sintering and synthesizing method to prepare the negative thermal expansion material Zr2P2MO12 and takes P2O5 as the raw material, thereby avoiding discharge of redundant ammonia and reducing pollution; and the negative thermal expansion material can be sintered for one time at the same time. The invention has the advantages that the reaction process is simple, the sintering speed is rapid, and the sintering time is short; and the raw materials can fully react at high temperature, and the produced product has high purity.

The invention discloses a process for preparing an activated mixed material through strand sintering of coal gangue. The process comprises the following steps: (1) crushing; (2) preparing materials, and uniformly mixing, namely sufficiently and uniformly mixing crushed coal gangue, quick lime, a carbon fuel and water in a cylinder mixing machine in a set ratio; (3) pelletizing, namely pelletizingthe uniformly mixed minerals into beads of a preset granularity; (4) sintering, namely performing allocation, ignition, air sucking sintering and cooling on the pelletized beads in a strand air sucking sintering machine; (5) crushing and finely grinding, namely crushing the sintered material, and finely grinding till a set specific surface area, thereby obtaining the activated mixed material. Theinvention provides the process for preparing an activated mixed material through strand sintering of coal gangue, by virtue of the properties that a combustion zone is high in temperature and short intime in the sintering process, a vitric phase can be formed, meanwhile, the sintered material mainly contains an oxidation atmosphere, harmful components such as organic matters, residual carbon andsulfur in the coal gangue can be removed at a high temperature, and the cementing property, the freezing resistance and the durability of cement are protected from adverse influence of the harmful components.

The invention relates to a co-gelation injection molding forming method of a gradient porous alloy, and belongs to the technical field of powder metallurgy preparation. A preparation method of the gradient porous alloy comprises the steps that premixed liquid is prepared and obtained, wherein the mass ratio of a monomer to a cross-linking agent is equal to (5-15):1, and the mass percentage concentration ranges from 5% to 40%; then metal powder is prepared, and the metal powder and the premixed liquid are mixed and prepared into series slurry with the raw material powder volume concentrations being A1, A2...Ai; and then the obtained series slurry is injected into a mold from different injection openings according to the sequence of the metal powder concentrations from large to small, curing and microwave sintering are carried out, and the gradient porous alloy is obtained. A gradient porous material or complex product with no obvious interface is prepared through the method, wherein the average pore size can change from 8 micrometers to 650 micrometers relatively continuously or according to design, and the porosity can change from 17% to 68% relatively continuously or according to design. The process is simple and controllable, cost is low, the production efficiency is high, near-net forming can be achieved, and the method is suitable for industrial volume production.

The invention discloses a production method of submicron-order tin-copper alloy powder. The production method comprises the following steps of: adding raw materials, namely tin and copper, into a crucible in a high-temperature metal evaporator, and filling inert gas into the crucible to flush a reaction system; evaporating tin-copper alloy gases by starting a plasma generator on the top of the high-temperature metal evaporator as a heating source; cooling the tin-copper alloy gases by introduced inert gas, thus obtaining a gas-solid mixture of tin-copper alloy; and conveying the gas-solid mixture of the tin-copper alloy onto the outer wall of a gas-solid separator in an alloy powder collector through introducing inert gas into evaporator, and filling the inert gas to concentrate tin-copper alloy particles into a collection hopper at the bottom of the collector, thus the obtaining spherical tin-copper alloy powder. The submicron-order tin-copper alloy powder produced by the method has the advantages of being spherical, being low in oxygen content, reaching grain sizes ranging from 100nm to 3000nm, being uniform in size distribution, large in specific surface area and strong in surface activity, and needing low energy in oxidation.

The invention discloses a ceramic material sintering furnace and an isostatic pressing field-controlled spark pulse sintering method, namely isostatic pressing and spark pulse field controlled sintering for short. The isostatic pressing and spark pulse field controlled sintering is characterized by comprising preparation of a ceramic blank, an isostatic pressing and spark pulse field controlled sintering furnace, processing of a ceramic sintering body, and an isostatic pressing and spark pulse field controlled sintering method, wherein the isostatic pressing and spark pulse field controlled sintering furnace comprises a lower furnace body, a thermocouple, an upper furnace body, an electrode plate, an bench insulator, an electrode lead, a graphite packing, a control electric field, a rubber seal cartridge, an insulating ring adaptor, a pressure gauge, a gas cylinder, a gas valve, a compressor, a gas inlet, a gas outlet, an impulse current generator, a sintering controller and fixing support feet, the isostatic pressing and spark pulse field controlled sintering method enables the transfer and direction of the heat energy, pressure and electromagnetic field of macroscopic and microcosmic ceramic materials to tend to be uniform due to the application of the discharge plasma pulse currents and alternating electromagnetic fields on the blank and the comprehensive action of gas isostatic pressing, the ceramic material is uniformly and isotropously sintered in the microcosmic crystal lattice, the grain boundary and the dot matrix, so that the various performances of the sintered structural ceramic material are improved.

The invention relates to a preparation method for a porous carbon material. The preparation method comprises the following steps: (1) mixing thermoplastic polymer powder with flow promoter, thereby acquiring a powdered raw material, and then performing 3D printing to manufacture a green component, and (2) placing the green component into a thermal treatment furnace with a protective atmosphere andthen carbonating under high temperature, thereby acquiring a product of the porous carbon material. In the invention, a 3D printing technique is adopted for sintering the thermoplastic polymer so asto form a carbon precursor and then carbonization is performed so as to acquire the porous carbon material with a multilevel porous structure; the preparation method for a three-dimensional porous carbon material is low in cost, universal and high in efficiency; the prepared porous carbon material can be applied to the fields of catalyst carriers, batteries, adsorption separation, and the like.

It is a layer cobalt oxidation thermoelectricity material process method, which comprises the following steps: to process the solution with concentration of 0.1 to 0.5mol/l by adding Ca#-[2]Co#-[2]O#-[5]íóCa#-[3]Co#-[4]O#-[9]íó M#-[x]Ca#-[2-x]Co#-[2]O#-[5]íóM#-[x]Ca#-[3-x]Co#-[4]O#-[9] as their positive ion countered; to mix the solution and drop with co-deposit agent of sodium hydroxide, sodium carbonate, oxalic acid ammonium or their mixture; to control the pH value between 12.5 to 13.6 to process drive powder after depositing, filtering and washing and drying; to burn it under 600 to 800 degrees for two to six hours and put it into the mode.

The invention provides a method for improving the air permeability of a sintering material layer. According to the method, prepared air-permeable particles are added into a sintering material according to the proportion in a layered mode when cloth is sintered. A preparation method of the air-permeable particles comprises the following steps that a, material proportion is carried out, wherein sawdust accounts for 50%, slaked lime powder accounts for 4-5%, and the balance is iron mine powder; b, granulating is carried out, wherein the air-permeable particle raw materials are uniformly mixed, and are made into spherical bodies with the diameter of 8-10 mm through a granulating machine; and c, the air-permeable particles are conveyed to a silo for later use after being cooled and screened, wherein in the cloth sintering process, the air-permeable particles are added into two layer bodies which are located at the position with the height of five-thirds of the height of the material layerand at the position with the height of one third of the height of the material layer correspondingly by utilizing a ball distributing device. The invention further provides the ball distributing device for adding the air-permeable particles. According to the method and ball distributing device for improving the air permeability of the sintering material layer, the permeability of the interior of the sintering material is effectively improved, the sintering speed can be increased under the condition that the physical and chemical properties of sintering ore are improved, and a foundation is laid for sintering and production increase.

The invention discloses a sintering synthesis method for nanometer negative expansion ceramic Zr2(WO4)(PO4)2, which belongs to the field of inorganic non-metallic materials. According to the invention, ZrO2, WO3 and P2O5 are used as raw materials; the raw materials are weighed according to a stoichiometric ratio of Zr to W to P in the target product Zr2(WO4)(PO4)2 of 2: 1: 2; MgO which accounts for 0.5 to 1.5% of the total weight of the raw materials of ZrO2, WO3 and P2O5 is added, MgO and the raw materials are ground and uniformly mixed, then are dried, and then are ground and uniformly mixed again, and an obtained mixture is subjected to direct one-step sintering synthesis or to one-step sintering synthesis after performing, and a product obtained after sintering synthesis is quenched in the air so as to obtain the target product; wherein, sintering parameters are: temperature 1350 to 1450 DEG C, time 2 to 20 min. The invention has the advantages of a simple process, no pollution, a fast sintering speed and suitability for large scale production; Zr2(WO4)(PO4)2 has an average particle size in order of magnitude of hundreds of nanometers.

The present invention is the preparation process of Ca3Co2O6-base thermoelectric oxide material. The preparation process includes dissolving the material in the ratio of Can ion to Co ion of 3/2, complexing agent citric acid or tartaric acid and surface dispersant hexadiol or Tween and regulating pH value to 1.2-3.5; concentration to form gel; grinding, pre-treatment at 400-600 deg.c to eliminate organic matter and nitrate, and calcining at 900-950 deg.c to obtain Ca3Co2O6 oxide powder; and densifying the oxide powder in some mold, plasma discharge to sinter at temperature raising speed of 130-150 deg.c/min and temperature 850-900 deg.c for 3-10 min. The present invention has relatively low reaction temperature and relatively short reaction time, and the synthesized Ca3Co2O6-base thermoelectric oxide material has high chemical homogeneity and crystal grain homogeneity.

The invention discloses a preparation method of a gunning mix for kiln repair. The preparation method comprises the following steps in sequence: breaking dead burnt magnesia into large dead burnt magnesia particles; grinding the large dead burnt magnesia particles into small dead burnt magnesia particles; grinding part of the small dead burnt magnesia particles into dead burnt magnesia fine powder with a particle size of 0.088mm; breaking forsterite into large forsterite particles; grinding the large forsterite particles into small forsterite particles with particle sizes of 0.1-3mm; weighting borax, inorganic salt, sodium tripolyphosphate and sodium hexametaphosphate, premixing the materials and conveying the materials to a mixing system after premixing; screening the materials according to the difference of particle sizes; filling the small particles and the micro powder into a mixing system tank and conveying the materials to the mixing system after the materials are mixed; stirring dead burnt magnesia, forsterite, borax, inorganic salt, sodium tripolyphosphate and sodium hexametaphosphate in the mixing system simultaneously and then subpackaging the product, thus obtaining a finished product of the gunning mix. The preparation method has the beneficial effects that the formula is simple, thus reducing the inventory costs of the raw materials; the prepared product has a high adhesive rate, thus lowering the production cost.

This invention provides a semiconductor device that can prevent the leakage current increases when the TFT cuts off to improve the reliability and its manufacturing method, this semiconductor device has thin film transistor (TFT), the TFT has: semiconductor layer that contains channel region, source region and drain region; the grid insulated film set in the semiconductor layer; the grid electrode that controls conductivity of the channel region; there is a tiny convex on the surface of the semiconductor layer, the lateral inclining angle of the grid electrode is greater than inclining angle of the convex of the semiconductor layer.

The invention belongs to the field of wall material production, and particularly relates to a coal slime tailings, a sintered brick prepared from coal slime tailings and a preparation method thereof.The raw material of the sintered brick is the tailings separated by a separation column; the tailings comprises the following, by mass 40%-55% of SiO2, 16%-30% of Al2O3, 1%-5% of Fe2O3, 1%-5% of CaO,and the balance other elements; and the calorific value of the coal slime tailings is less than or equal to 2.5 MJ/kg. The sintered brick has high compressive strength and light weight, and has the characteristics of frost resistance, sound absorption, corrosion resistance, water permeability and air permeability; the brick has uniform size and no deviation; the brick surface is clean and smooth,and edges and corners are distinct; the color is uniform; and the preparation method has simple process, so that the energy waste is reduced.