36results about How to "High degree of sintering" patented technology

A spherical silver powder which has a good dispersibility and which is capable of obtaining a good degree of sintering even if it is used for forming a paste to be fired at a low temperature of 600° C. or less to form a conductor. An aqueous solution containing a reducing agent is added to a water reaction system containing silver ions, to deposit silver particles by reduction, to produce a spherical silver powder which has a shrinkage of 5 to 15% at 500° C., a shrinkage of 10 to 20% at 600° C., a mean particle size of not greater than 5 μm, a tap density of not less than 2 g/cm³, and a BET specific surface area of not greater than 5 m²/g.

The invention relates to a fine-grained cubic boron nitride blade. The blade is prepared from, by weight, 60%-80% of micro cubic boron nitride powder and 20%-40% of nano-binder, wherein the nano-binder is prepared from, by weight, 25%-45% of TiN powder, 17%-20% of NbC powder, 12%-15% of Al2O3 powder, 12%-15% of HfC powder, 6%-10% of Be powder, 6%-10% of WC powder and 2%-5% of Mo power. By adding the nano-binder, formation of a tough sintering body is promoted, the toughness of the cubic boron nitride blade is increased, and the service life is prolonged. According to the fine-grained cubic boron nitride blade prepared through the preparation method, the technical indexes can reach the conditions that the grain size is smaller than or equal to 1 micrometer, the abrasive ratio ranges from 7,000 to 7,500, the microhardness HV ranges from 6,000 to 6,500, and the bending strength ranges from 850 MPa to 900 MPa, and the requirements of precise machining can be met.

The invention relates to strengthened dolomite pottery blank mud and particularly relates to a formula of the strengthened dolomite pottery blank mud, which can form a coupling and self-adapting blank glaze intermediate layer through blank glaze mass transfer interaction, and a preparation process thereof. The blank mud contains the following chemical ingredients in percentage by weight: 60-70% of SiO2, 11-15% of Al2O3, 6-10% of MgO, 2-8% of CaO, 0.5-3.0% of K2O, 0.5-3.0% of Na2O and 3.5-7.0% of loss on ignition, wherein the total ingredient content of MgO and CaO is higher than 12%, and the total ingredient content of Na2O and K2O is lower than 3%. According to strengthened dolomite pottery prepared from the blank glaze coupled and self-adapted strengthened dolomite pottery blank mud disclosed by the invention through firing, when the strengthened dolomite pottery is autoclaved for 30 minutes in an autoclave at the temperature of 170 DEG C while maintaining the pressure of 500KPa, the phenomena of glaze peeling and glaze cracking do not occur, so that the blank glaze binding performance reaches the standards of export products.

The invention discloses a low-cost aluminum nitride crystal growing method. According to the method, a tantalum carbide crucible is substituted with a graphite crucible, wherein a graphite crucible islined with a layer of a tantalum carbide metal shell layer to isolate the graphite crucible so as to prevent from corrosion by aluminum vapor; an aluminum nitride ceramic baffle with holes is arranged in the crucible to sandwich an aluminum nitride powder source with characteristics of large specific surface area and small particle size between the graphite crucible and an internal material source, such that gas is subjected to preliminary filtering, a chemical reaction with the graphite impurity is performed, oxygen atoms are removed, and carbon impurities are separated; the medium-size aluminum nitride powder particles in the middle-lower interlayer provide a secondary filtration effect; and a large-particle and highly-purified aluminum nitride source grows at the top of the material source, such that the large-size centimeter-scale aluminum nitride single crystal with characteristics of less impurities and high crystal quality (no crack and no micropore) is obtained.

A method of manufacturing a preform for compounding use which, is to be impregnated with a molten metal to be compounded with a matrix material, is provided. The method includes the step of mixing short fibers, ceramic particles and a binder material together to make a mixture. The average of lengths of the short fibers is 100 to 200 mum while the volumetric percentage of the short fibers is 1 to 7 %. The content of the binder material in the mixture is 0.3 to 5.0 mass %. The method includes also the steps of forming the mixture so as to have a predetermined shape, and sintering the mixture at a temperature of 1000 to 1150° C. to form the preform. Thus, it is restrained that the preform is deformed or an un-reinforced region is formed in the compounded portion.

The invention relates to preparation and sintering of a single-aperture blank of an oxygen self-supported permanent magnetic ferrite pre-sintering material and belongs to the technical field of preparation of magnetic functional materials. The technical scheme is carried out according to a main-phase molecular formula: Srl-xBaxO.nFe (12-y)/nRy/nO3, wherein x is not less than 0 and is not greater than 0.998, and n is not less than 5.75 and not greater than 6.15, 0 & 1t; y is not greater than 0.6, and R is Mn and is secondarily added with one or more than two of industrial pure oxides CeO2, GeO2 and MnO2. To the prepared pre-sintering material and a high-performance permanent magnetic ferrite material prepared from auxiliary secondary adding, the residual magnetism Br value is at least 392 mT, the Hcj value is at least 343.1 kA/m, and the BHmax value is at least 27.9 kJ/m<3>. The preparation and sintering have the advantages that a certain amount of K2MnO4 is added to a raw material of the ferrite pre-sintering material prepared by one-time sintering and meanwhile MnO2 is added into a secondary adding auxiliary material, so that the uniformity of performance of the same batch of products is improved, and the grain refinement is facilitated at the same time; the problem of the restriction of residual magnetic flux density Br and Hcj is effectively solved, and the prepared permanent magnetic ferrite has high Br and Hcj.

The invention discloses an enhanced coal gangue brick, an belongs to the technical field of building materials. The enhanced coal gangue brick is produced through the following steps: sequentially weighing, by weight, 75-85 parts of coal gangue, 4-6 parts of clay, 10-15 parts of iron oxide powder, 15-25 parts of potassium permanganate, 5-12 parts of aluminum powder, 20-23 parts of fly ash and 5-8parts of modified glass fibers, crushing and sieving the coal gangue to obtain coal gangue powder, mixing the clay, iron oxide powder, potassium permanganate, he aluminum powder, fly ash and the modified glass fibers in a ball mill to obtain a mixture, mixing the mixture with the coal gangue powder, adding the finally obtained mixture into a die, performing compression molding to obtain a green body, drying the green body, transferring the dried green body into a sintering furnace, sintering the dried green body, performing furnace cooling to room temperature, discharging the sintered green body, and curing the sintered green body to obtain the enhanced coal gangue brick. The coal gangue brick produced in the invention has good mechanical properties, and has a reduced frosting phenomenon.

The invention discloses a high strength ceramic tile, which comprises the following steps: allocating mass percent of each component as 60-68% SiO2, 16-19% ALO3, 0. 5-2% Fe2O3, 0. 5-3% TiO2, 1-3% CaO, 1-3% MgO, 2-5% K2O, 1-3% NaO2 and 4-8% IL; setting the balling slip glaze fineness at 9-13% of 250 order sieve residue; setting the specific gravity of serous at 1. 68-1. 82g/cm3; setting the current rate of the slurry at about 15-50S; choosing the warehousing moisture mass percent at 7-8% of the powder and the deliver from godown moisture percent at 6. 8-7. 85; setting the particle size of the powder at 50-60% of 40 order sieve residue and 30-40% of 60 order sieve residue. This invention can increase bearing force by about 40% of glazed tile, which decreases damage ratio and cost.

The invention provides a pressure-resistant anorthite lightweight refractory material and a preparation method thereof. The preparation method comprises the steps of A) mixing 48-55wt% of coal gangue,3-6wt% of kyanite, 4.5-6.5wt% of pyrophyllite, 10-14.5wt% of refractory clay, 9.5-15.5wt% of calcium carbonate, 5-10wt% of high alumina cement and 3-8wt% of an auxiliary agent to obtain a castable, wherein the particle size of calcium carbonate is 550-650 meshes, the particle size of the refractory clay is 300-400 meshes, and the particle size of the high-alumina cement is 300-400 meshes; B) molding the castable by casting, demolding, and drying to obtain a dried green body; and C) firing the dried green body to obtain the pressure-resistant anorthite lightweight refractory material. According to the invention, grain composition is carried out, the wet blank strength is improved, and the wet blank qualification rate is improved by about 20%.

The invention relates to the technical field of building materials, in particular to light high-strength concrete and a preparation method thereof. The preparation method comprises the following steps: mixing sepiolite with water, adding Bacillus pasteurii, urea and magnesium nitrate, carrying out mixing under stirring, performing rotary evaporation for concentration, and carrying out drying and calcining so as to obtain modified sepiolite; mixing bamboo fibers with a sodium hydroxide solution and carrying out filtering to obtain filter residues No. 1; putting the filter residue No. 1 into sulfuric acid, and successively carrying out mixing, filtering and washing to obtain filter residues No. 2; subjecting the filter residues No. 2 and tetraethoxysilane to mixing and ball-milling, then adding a dopamine solution, and successively carrying out filtering, drying, heating step by step and high-temperature treatment to obtain modified fibers; and mixing sea sand, cement, modified fly ash,the modified sepiolite, water, a silane coupling agent, an aqueous polyethyleneimine solution, a peach gum solution and the modified fibers to obtain the lightweight high-strength concrete. The lightweight high-strength concrete provided by the invention has good mechanical properties.

A material processing and associated additive manufacturing system and method that utilizes high intensity light to fuse an entire layer of material, at one time, to create a three-dimensional component. The system and method of the present invention allows for each layer to be created in a fraction of the time, thereby reducing the overall time for a three-dimensional component to be created, thereby increasing control over the properties achieved.

The invention discloses a high-quality smoked brick. The smoked brick is prepared from the following raw materials in percentage by weight: 50 to 60 percent of plastic pug, 10 to 20 percent of clinkerparticles, 10 to 15 percent of sandy raw materials, 5 to 10 percent of flux, 0 to 10 percent of body pigment and 0.5 to 2 percent of lithium feldspar. Correspondingly, the invention further disclosesa preparation method of the high-quality smoked brick. The method comprises the steps of mixing, aging, drying and burning. The smoked brick and the preparation method thereof disclosed by the invention have the advantages of easiness in controlling a burning process and high quality of smoked bricks.

The invention discloses a light porcelain insulation board and a preparation method thereof, and belongs to the technical field of light porcelain insulation boards. In the prior art, in order to ensure that all raw materials have a large contact area and are fully combined in the sintering process, the particle size of a matrix raw material which is generally adopted is usually small and is generally smaller than 1.5 mm, although the sintering difficulty is reduced, the superfine matrix particles are layered more easily in the sintering process, and the modification performance and even the yield of an intermediate are low. According to the light porcelain insulation board, the perlite particles with the particle size of 1-10 mm are matched with the inorganic foaming adhesive which mainly comprises 10-84 parts of ceramic dry particles, 10-70 parts of ceramic frits, 5-30 parts of bentonite, 0.1-3 parts of foaming agent and 0.1-3 parts of ligand enhancer, the light porcelain insulation board is prepared, and the light porcelain insulation board is low in heat conductivity coefficient, simple in component, easy to prepare and high in yield.

The invention discloses a method for improving adhesion resistance of the surface of a red porcelain vessel. In order to overcome the defects that when the existing red porcelain vessel is used as a liner of a cooking electric appliance or is used as a heating container, because adhesion is easily caused between the red porcelain vessel wall and food, the red porcelain vessel is difficult to clean and the like, the method is characterized by uniformly mixing the prepared engobe raw materials for coating the surface of the red porcelain vessel, and milling by a gas-mesh mill until the engobe particle size reaches more than 500 meshes. The method disclosed by the invention is used for improving the adhesion resistance of the surface of the red porcelain vessel, thus the red porcelain vessel used as the liner of the cooking electric appliance has good adhesion resistance, the adhesion is not easily caused between the red porcelain vessel wall and food, and the red porcelain vessel is very easy to clean.

The invention provides a muffle furnace tube structure of an atmosphere push plate furnace. The bottom surface of a hearth is an inclined plane, the bottom of the hearth is provided with a plurality of glue discharging channels, the glue discharging channels communicate with the interior of the hearth, the glue discharging channels are arranged along the length direction of the hearth, an outlet of the hearth is provided with a side wall air inlet curtain, and air enters from the side wall air inlet curtain; and the flue gas in the hearth is driven to the inlet of the hearth, so that the muffle furnace tube structure has the following advantages: sintering degree of products in the hearth can be improved, and meanwhile, the glue discharging degree in the hearth is also improved.