13742 results about "Sintering" patented technology

Provided here is a method of producing a monolithic body from a porous matrix, comprising: (i) providing a porous matrix having interstitial spaces and comprising at least a first reactant; (ii) contacting the porous matrix with an infiltrating medium that carries at least a second reactant; (iii) allowing the infiltrating medium to infiltrate at least a portion of the interstitial spaces of the porous matrix under conditions that promote a reaction between the at least first reactant and the at least second reactant to provide at least a first product; and (iv) allowing the at least first product to form and fill at least a portion of the interstitial spaces of the porous matrix, thereby producing a monolithic body, wherein the monolithic body does not comprise barium titanate.

The invention belongs to energy materials, particularly relating to a method for preparing nanometer ferrous phosphate lithium /carbon composite material. In the invention, ferrous source, lithium source, phosphorus source are mixed with a small quantity of doped metal salt and organic macromolecular polymer carbon source according to certain ratio followed by the steps of ball milling, parching and calcining. High temperature sintering is carried out on the above mixture in the atmosphere of non-oxidation gas to obtain nanometer lithium iron phosphate LiMxFe(1-x)PO4/C coated with carbon and LiFe(1-x)NxPO4/C material, and the particle sizes of which are remarkably reduced and are less than 100nm. When the material is applied to battery assemble, 0.2C multiplying power discharge capacity can reach above 160mAh/g at room temperature, 1C multiplying power discharge capacity can be 140-155mAh/g, and 5C multiplying power discharge capacity is 130-150mAh/g. the initial capacity is 120-140mAh/g under the large multiplying power of 10C, and remains more than 90% through thousands of cycles, demonstrating good multiplying power and cycle properties. The invention features low cost, simple production process and fine safety. The prepared nanometer ferrous phosphate lithium /carbon composite material can be widely applied into manufacturing of convenient and fast equipment, electric vehicles and the like.

The invention discloses a method of vanadium slag direct entering high temperature roasting furnace calcify roasting, that is, high calcium vanadium slag or ordinary vanadium slag and lime or limestone are mixed uniformly without the gradual heating up process from low temperature to high temperature, the mixture enters into the roasting furnace of more than 600 DEG C for calcified roasting., the vanadium of the vanadium slag is changed into vanadium acid calcium, vanadium of the roasting clinker is dissolved into the solution under the leaching function of sulphuric acid solution, vanadium oxide and the like vanadium products are further made. The invention needs no gradual heating up process from low temperature to high temperature of the prior sodium treatment roasting, thereby reducing roasting time, improving productivity of unit and reducing production cost.

A sintering powder containing polyamide polymer and titanium dioxide particles, a process for laser sintering, and moldings produced from the sintering powder. The moldings formed using the powder of the invention have improved surface quality due to the powders having increased yellowing resistance when exposed to thermal stress during laser sintering. Moldings produced from the sintering powder have improved mechanical properties, in particular modulus of elasticity.

The invention relates to a method for preparing a composite material for a cathode of a lithium ion battery, and the cathode and the battery which comprise the cathode material. The preparation method comprises: uniformly mixing silicon powder, graphite, pyrolytic carbon precursor and a solvent to prepare slurry, wherein the silicon powder comprises micro-silicon powder and nano-silicon powder, and the weight ratio of the micro-silicon powder and the nano-silicon powder is 2-20:1; and removing the solvent in the slurry, performing primary sintering under the protection of inert gas, performing primary ball grinding, performing secondary sintering under the protection of the inert gas, and performing secondary ball grinding, wherein the temperature of the secondary sintering is higher than that of the primary sintering. The battery made from the composite material for the cathode of the lithium ion battery obtained by the method has good cycling performance and charge and discharge capacity.

The present invention relates to technology and apparatus with high energy beam to sinter or melt and deposit material successively to realize laminated solid manufacture. The present invention features that the electronic beam scan controller controls the electronic beam to scan fast in pattern projection mode for heating powder homogeneously. Each scanning of the electronic beam has short time in the selected area, so that the scan initiating point has no great temperature change generated during the whole scanning course. Through one or several frames of scanning, the material in the forming area has temperature synchronously raised to reach the sintering or re-melting temperature for deposition onto the forming area before synchronous cooling. The present invention has greatly reduced heat stress and raised forming precision and quality.

A process for the dimensionally-true sintering of ceramic pre-shaped items, in which the firing material is resting during sintering on supporting devices, not coated with metal, which independently adapt to the shrinkage dimensions which occur during the firing process or allow a contact-free support of the pre-shaped items.

A shaped charge liner formed by injection molding, where the liner components include powdered metal and organic binder. The liner components are blended then processed within an injection molding device and urged from the molding device into a mold where a liner shape is formed. The liner shape is debinded, both mechanically and chemically. Mechanical debinding involves heating and chemical debinding comprises treating the liner shape with a solution to dissolve and remove the binder components. The process of forming the shaped charge liner does not include sintering. The present process can also use “green products” formed by the injection molding device that are not debinded. A shaped charge case can also be formed using the present method. The added step of sintering can be applied to the process of forming the shaped charge case.

A ceramic material has particular utility as a thermal insulating or thermal barrier coating on metallic substrates. The ceramic material includes gadolinia and hafnia, preferably forming gadolinia-hafnia. This material exhibits chemical stability, thermal stability and thermal insulating properties superior to those of currently used thermal barrier ceramics, and also provides resistance to sintering and erosion comparable to currently used ceramics. A preferred material has between about 3-70 mol. % hafnia, balance hafnia.

The present invention provides a nano-precision sintering system 1 for sintering a nano-sized powder of a material in the pulse energization and pressure sintering process to obtain a highly purified sintered compact having a nano-sized grain structure, said nano-precision sintering system 1 comprising: at least one pre-process chamber 20 defined by at least one sealed housing 21 having at least one glove and designed to be controlled into a predetermined atmosphere; a sintering process chamber 30 defined by a sealed housing 31 having at least one glove and designed to be controlled into a predetermined atmosphere; a shut-off system 26 disposed in a passage providing communication between the pre-process chamber and the sintering process chamber so as to block the communication between the two chambers selectively while keeping it in an air tight condition; and a pulse energization and pressure sintering machine 50 having a vacuum chamber “C” allowing for the sintering process to be carried out under a vacuum atmosphere, wherein the vacuum chamber is disposed in the sintering process chamber such that the former can be isolated from the latter.

The invention is directed to a glass composition that can be used to make glass frits suitable for use in the manufacturing of microreactors. The glass compositions, after final sintering to produce a finished microreactor, have a surface crystalline layer of 30 μm or less, or are completely amorphous throughout. Generally, the borosilicate glasses of the invention have a composition of B₂O₃=12-22 mol %; SiO₂=68-80 mol % and additional components selected from the group consisting of either (a) Al₂O₃=3-8 mol % and Li₂O=1-8 mol %, or (b) K₂O=0-2 mol % and Na₂O=0-2 mol %, except that both K₂O and Na₂O cannot both equal zero at the same time. One borosilicate glass has a composition, in mole percent (mol %) of B₂O₃=18-22 mol %, SiO₂=75-80 mol %, K₂O=0-2 mol %, and Na₂O=0-2 mol %, except that both K₂O and Na₂O cannot both equal zero at the same time.

A sintered insulating hollow building block is prepared from coal gangue, powdered coal ash, steel slags, metallurgical tailings, red mud, and rejected solid (building garbage, life garbage and city mud) or shale through proportionally adding adhesive and millipore forming agent and sintering.

A metal powder for use in a metal laser-sintering wherein a three-dimensional shaped object is produced by irradiating a powder layer of the metal powder with a light beam to form a sintered layer and thereby laminating the sintered layers. The metal powder of the present invention is characterized in that it comprises an iron-based powder and at least one kind of powder selected from the group consisting of a nickel powder, a nickel-based alloy powder, a copper powder, a copper-based alloy powder and a graphite powder; and the iron-based powder has been annealed. In such metal powder, the iron-based powder is in a softened state due to the annealing treatment thereof. Accordingly, the use of the metal powder in a metal laser-sintering process makes it possible to reduce a machining resistance attributable to the residual metal powder adherent to the surface of the shaped object, which leads to an achievement of an extended lifetime of a machining tool.

The invention discloses a porous film and a preparation method of the porous film, which can easily achieve high porosity and guarantee the formability during the preparation, and are simple and practical in preparation process. The thickness of the porous film is 200-1500[mu]m, the average aperture of the porous film is 0.05-100[mu]m, and the porosity of the porous film is 25-75%. The preparation method includes (1) acquiring a support film which has a porous first material, and forming primary pores in the first material; (2) preparing slurry containing a powder-like second material; (3) coating the support film with the slurry to prepare a base substrate; (4) sintering the base substrate, generating a porous third material through the reaction between the first material and the second material during the sintering, and further generating secondary pores communicated with the primary pores; and (5) cooling the base substrate to obtain the porous film after the sintering. The porous film at least contains the primary pores and the secondary pores, so that the porous film is easy to achieve high porosity.

The invention discloses a porous thin film and a preparation method for the porous thin film which are easy to achieve the high porosity, guarantee the possible formability in preparation and are simple and practical in preparation technology. The thickness of the porous thin film is 5-200Mum, the average pore size is 0.05-100Mum, and the porosity is 25-75%. The preparation method comprises the steps that 1, a support film is obtained, the support film is provided with a porous-shaped first material, and preliminary pores are formed in the first material; 2, a slurry is prepared, and the slurry contains a powdered second material; 3, the support film is coated with the slurry and then made into a rough-body; 4, the rough-body is sintered, auto-reaction happens to the second material in sintering, a porous third material is generated, and then secondary pores communicated with the preliminary pores are generated; 5, the porous thin film is obtained by cooling after the sintering. Due to the fact that at least the preliminary pores and the secondary pores are contained, the high porosity of the porous thin film is easy to achieve.

A paste including metal or metal alloy particles (which are preferably silver or silver alloy), a dispersant material, and a binder is used to form an electrical, mechanical or thermal interconnect between a device and a substrate. By using nanoscale particles (i.e., those which are less than 500 nm in size and most preferably less than 100 nm in size), the metal or metal alloy particles can be sintered at a low temperature to form a metal or metal alloy layer which is desired to allow good electrical, thermal and mechanical bonding, yet the metal or metal alloy layer can enable usage at a high temperature such as would be desired for SiC, GaN, or diamond (e.g., wide bandgap devices). Furthermore, significant application of pressure to form the densified layers is not required, as would be the case with micrometer sized particles. In addition, the binder can be varied so as to insulate the metal particles until a desired sintering temperature is reached; thereby permitting fast and complete sintering to be achieved.

The present invention is a method for producing functionally graded materials that contain a hard phase that is embedded in a metal matrix phase. The material have a continuous gradient of a matrix metal phase. An example of these types of materials include functionally graded cemented tungsten carbide (the hard phase) that has a continuous gradient of cobalt (the matrix metal) from one reference position, for example, one surface of a part, to another reference position, for example, the opposite surface of the part or within the part. The functionally graded materials are sintered via a liquid phase sintering (LPS) technique. In order to achieve the desired continuous gradient of the matrix metal, an initial gradient of one of the chemical elements of the hard phase is designed and built into the part prior to liquid phase sintering. The exact gradient of the composition material elements that will be required depends on factors such as the desired final matrix metal gradient, the dimension of the part to be made, and the sintering time and temperature.

The invention relates to a high viscosity solar cell front silver serum and a preparation method thereof. The composition and the weight ratio of the high viscosity solar cell front silver serum are that conductive silver powder accounts for 75-85 percent, glass glue accounts for 2-10 percent, organic carrier accounts for 5.5-20 percent, the particle size of the conductive silver powder is 0.2-2mum; the composition and the weight ratio of the glass glue are that Bi2O3 accounts for 65-85 percent, SiO2 accounts for 5-20 percent, PbO accounts for 1-15 percent and Al2O3 accounts for 1-5 percent. After such processes are carried out by the serum as screen printing, low temperature drying and high temperature sintering, the aspect ratio of a conducting electrode formed on the surface of solar cell is high, the solar cell produced by using the method has small front shading area and high photoelectric conversion efficiency.

The invention provides a method for producing synthetic natural gas and a device thereof. The continuous technological process of the invention is realized in a way that gasified product gas is used as the raw material for producing high methane gas containing more than 94 mol% of methane. The method can well adjust the methanation reaction temperature and avoid the problems of catalyst temperature-runaway sintering and the like due to improper material composition, excessive fluctuation or unexpected accident, thereby reducing the recycle gas amount and enhancing the energy comprehensive utilization efficiency.

The invention relates to a preparation method for a silicon carbide ceramic tube or rod. An extrusion moulding method is adopted to form a blank body; a normal pressure sintering method is adopted for sintering; and submicron level silicon carbide powder and additives are taken as main raw materials. The preparation method comprises the following steps: 1) carrying out ball milling on the main raw materials by a dry method, adding water, a dispersant, a plasticizer, a lubricant and a liquid state binder, and then carrying out ball milling by a wet method; 2) adopting a spray granulation process to granulate silicon carbide slurry; 3) extruding the blank body by a one-shot direct extrusion moulding method after vacuum pug, corrosion, and vacuum pug; 4) drying the molded blank body by a stage drying mechanism; and 5) placing the blank body of the silicon carbide ceramic tube or rod in a vacuum furnace and carrying out sintering for two times by taking argon gas as protective gas. The high temperature resisting strength and the corrosion resistance of the silicon carbide ceramic tube or rod prepared by the method are both better than those of a reactive sintered product. Compared with a hot press sintering method, the method has lower limit on the product shape and size, and lower cost. The method is suitable for the industrialized production.