154 results about "Non oxide ceramics" patented technology

Armor apparatus comprising a non-oxide ceramic element bounded to an aramid fiber composite baking. A special ceramic and a novel aramid fiber substrate are combined in a unique arrangement that permits a single armor system to provide protection against multiple types of ballistic attack. The armor apparatus may be used alone or as a supplementary armor system to provide increased protection from ballistic attack.

A hot gas filtration apparatus includes a vessel, a plurality of filter elements mounted within the vessel and positioned such that hot gas flows through said filter elements, with each of said filter elements having a porous body, and a catalytic layer on surfaces of the porous body. The porous body of the filter element may include one of: a porous ceramic monolithic matrix, a continuous fiber reinforced ceramic composite (CFCC) matrix, a metallic matrix, an intermetallic matrix, a superalloy, and a metal-ceramic composite matrix. When the porous body is a nonoxide ceramic, a metallic matrix, an intermetallic matrix, a superalloy, or a metal-ceramic composite matrix, the invention further includes an oxidative resistant layer coating surfaces within the porous body, and the catalytic layer is on the oxidative resistant layer. A porous particulate removal membrane can be positioned on one or more surfaces of the filter element. The porous membrane can also provide a surface for one or more catalysts. The catalysts on the porous surface of the membrane(s) can be the same as or different from the catalysts on surfaces within the porous body.

An ultracapacitor or hybrid capacitor includes an electrically non-conductive rigid or semi-rigid porous honeycomb structure (12) having cells extending along a common direction and having an average density per unit area within in a plane perpendicular to the common direction exceeding 15.5 per square centimeter, desirably formed of a material that is stable at temperatures of 300° or more, such that high temperatures processing can be used to help ensure high purity of the final product. The material may desirably be an oxide or non-oxide ceramic, such as cordierite, silicon nitride, alumina, aluminum titanate, zircon, glass, or glass-ceramic.

The invention discloses a method for preparing an ultra-fine diamond grinding wheel of a vitrified bond, belongs to the technical field of ultra-precision machining of hard brittle and soft brittle photoelectric crystals, and in particular relates to the method for preparing an ultra-fine diamond grinding wheel of photoelectric semiconductor hard brittle and soft brittle photoelectric crystals. The method is characterized by comprising the following steps of: taking ultra-fine diamond powder which has a particle size of a fixed valve from #10,000 to #300,000 as an ultra-fine diamond grinding material; taking three or four ultra-fine non-oxide ceramics as bonding agents, taking one or two of chlorides or nitrates of potassium, calcium, sodium and magnesium as a dispersant and a refiner; taking one or two of dextrine, carbonates and hydrocarbonates as a foaming agent; pressing and molding by a cold-press molding method; uniformly heating to the temperature of between 480 and 530 DEG C from a room temperature; keeping the temperature for 30 to 60 minutes; uniformly heating to the temperature of between 580 and 610 DEG C; keeping the temperature for 40 to 60 minutes; uniformly heating to the temperature of between 640 and 680 DEG C; keeping the temperature for 100 to 150 minutes; and naturally cooling to the room temperature so as to sinter and mold the ultra-fine diamond grinding wheel. The method has the effects and the advantages of high-efficiency ultra-smooth low-damage grinding and high-efficiency ultra-precision grinding machining effect.

A block copolymer, preferably a block copolymer such as poly(isoprene-block-ethylene oxide), PI-b-PEO, is used as a structure directing agent for a polymer derived ceramic (PDC) precursor, preferably a silazane, most preferably a silazane commercially known as Ceraset. The PDC precursor is preferably polymerized after mixing with the block copolymer to form a nanostructured composite material. Through further heating steps, the nanostructured composite material can be transformed into a nanostructured non-oxide ceramic material, preferably a high temperature SiCN or SiC material.

The present invention provides a crosslinkable elastomer composition, in which generation of HF under high temperature conditions is reduced, the decrease in weight to both NF₃ plasma treatment and O₃ treatment in the semiconductor manufacturing process is small and generation of foreign substances (particles) in these treatments is suppressed significantly.

Specifically, the present invention relates to a crosslinkable elastomer composition comprising a crosslinkable elastomer and a filler having a specific surface area of at least 0.5 m²/g and containing a synthetic polymer having a thermally and chemically stable aromatic ring in the main chain, a crosslinkable elastomer composition comprising a crosslinkable elastomer and nonoxide ceramics and a crosslinkable elastomer composition wherein the decrease in weight by NF₃ plasma irradiation is at most 0.20%.

A heat-resistant coated member comprises a substrate composed of a material selected from among molybdenum, tantalum, tungsten, zirconium, aluminum, titanium, carbon, and alloys, oxide ceramics, non-oxide ceramics and carbide materials thereof, which is covered with a layer composed primarily of a rare earth-containing oxide. In addition to heat resistance, the coated member has good corrosion resistance and non-reactivity, making it highly suitable as a part for sintering or heat-treating metals and ceramics in a vacuum, an inert atmosphere or a reducing atmosphere.

The invention discloses a method for preparing a ceramic body. The method comprises the following steps: water is used as a solvent, and water-soluble polybutadiene vinyl polymer is added to the solvent to prepare ceramic slurry; the prepared ceramic slurry is injected into a forming mold, and self-gel in-situ solidification is conducted at the temperature of 15 DEG C-40 DEG C in the air; and demolding and drying are conducted after sufficient solidification. Due to the fact that the self-gel in-situ solidification is carried out on the water-soluble polybutadiene vinyl polymer which has the functions of a dispersing agent and a gel reagent at the same time, and is low in toxicity, low in cost and easy to obtain to prepare the ceramic body, preparation cost is greatly reduced and pollution is reduced. Moreover, the method is simple in preparation technology, free of oxygen inhibition, capable of being operated in the air and free of harsh operating conditions and equipment requirements. Besides, the prepared ceramic body is high in intensity, good in toughness, bright and clean in surface, free of exfoliation and suitable for preparation of various oxide ceramics, oxide ceramics, composite ceramics and ceramics with complex shapes, and thus the method for preparing the ceramic body has industrial application prospects.

The invention provides a preparation method for low-oxygen spherical aluminum nitride powder and pertains to the field of non-oxide ceramic powder material preparation technology. The low-oxygen spherical aluminum nitride powder can be obtained through the following steps: ball-grinding, evenly mixing and then drying aluminum nitride powder and appropriate amount of spherical auxiliary materials for deoxidation; placing the mixture in a graphite crucible with certain loading density, heating to 1,550 to 1,900 DEG C in N2 or Ar and preserving for 0 to 20 hours, and then cooling with the crucible; mechanically crashing the product and heating to 600 DEG C in a muffle furnace for carbon emission, then washing in a hydrochloric acid solution with 5 to 20 mass percent concentration and fully washing the product after acid cleaning in de-ionized water for 2 to 10 times; after drying, obtaining the aluminum nitride powder with 3 to 15mum median particle diameter, more than 90 percent sphericity and less than 1wt percent oxygen content. The preparation method provided by the invention can achieve spherical particle morphology and granulation at the same time required by the high thermal-conductivity aluminum nitride filling.

The invention relates to a reparative coating and the application thereof in repairing the coating of a silicon carbide-based composite material, and belongs to the technical field of repairing the anti-oxidation coating on the surface of the silicon carbide-based composite material. The reparative coating is prepared through the brush-coating process, wherein a non-oxide ceramic precursor is adopted as an adhesive and ceramic powders are adopted as fillings. In a high-temperature service environment, the precursor inside the coating is pyrolyzed to generate ceramics. In this way, the oxidation resistance and the cohesive property of the coating are further improved. The ceramic precursor can be cured by using a hand-held heating device, so that the dependence on equipment is greatly reduced. Therefore, the reparative coating and the application thereof have a very important role in simply repairing the anti-oxidation coating on the surface of a heterogenic thermal structural component made of the silicon carbide-based composite material.

Precoated metal sheet for automobile use which is excellent in resistance weldability, corrosion resistance, and formability is provided. The present invention provides precoated metal sheet for automobile use comprising a metal sheet and a coat (α) on at least one surface of the metal sheet, wherein the coat (α) comprising an organic resin (A), non-oxide ceramic particles (B) selected from at least one type of borides, carbides, nitrides, and silicides and which have an electrical resistivity at 25° C. of 0.1×10⁻⁶ to 185×10⁻⁶ Ωcm, and an anti-corrosive pigment (C).

Feed material comprising uniform solution precursor droplets is processed in a uniform melt state using microwave generated plasma. The plasma torch employed is capable of generating laminar gas flows and providing a uniform temperature profile within the plasma. Plasma exhaust products are quenched at high rates to yield amorphous products. Products of this process include spherical, highly porous and amorphous oxide ceramic particles such as magnesia-yttria (MgO—Y₂O₃). The present invention can also be used to produce amorphous non oxide ceramic particles comprised of Boron, Carbon, and Nitrogen which can be subsequently consolidated into super hard materials.

The invention relates to an inorganic bond, a preparation method thereof and an application for the preparation of a porous ceramic thereof. The bond consists of alumina and/or aluminum hydroxide, phosphoric acid and boric acid, wherein, the weight percentage content of the alumina and/or the aluminum hydroxide is 70 percent to 99.5 percent, the weight percentage content of the phosphoric acid is 30 percent to 0.5 percent, and additionally the weight percentage content of the boric acid is 0 percent to 15 percent. The weight percentage content of the aluminum hydroxide is converted into Al2O3. The mol ratio of phosphor and aluminum is less than one. When the bond is used for preparing for the porous ceramic, firstly the granular diameter of the alumina or the aluminum hydroxide used for preparing for the bond is confirmed, and the granular diameter of the alumina or the aluminum hydroxide for using is 0.01 time to 0.5 time of the granular diameter of ceramic powder material; non-oxide ceramic powder material is mixed uniformly and mixed uniformly with pore-forming agent or vesicant to be molded and sintered, the sintering temperature is between 900 DEG C to 1600 DEG C. The sintering atmosphere is processed in air or under the inert atmosphere.

The invention discloses a spray granulation method of non-oxide ceramic powder. The spray granulation method specifically comprises the following steps of: step one. material blending, to be specific, blending 35%-65% of non-oxide powder, 0%-3% of carbon powder, 0%-4% of dispersing agent, 0.05%-4.5% of binder and 30%-60% of deionized water in percentage by weight: and step two. preparing the raw materials in the step one into stable ceramic slurry by adopting ball-milling, high-speed stirring or ultrasonic dispersion, wherein the viscosity of the obtained slurry is not more than 5dpa.s; and step three. spray-drying and pelleting, to be specific, controlling the feed rate of the slurry prepared in the step two through a peristaltic pump, adding the slurry to a spray-drying granulator, and obtaining boron carbide pelleting materials by controlling the inlet and outlet temperature and pressure of the slurry, wherein the solid content of the obtained slurry for spray granulation can reach 65wt%.

Articles are described that include a substrate having thereon a coating that has two or more non-oxide compounds. A first one of the two or more non-oxide compounds is a non-oxide ceramic compound, and the two or more non-oxide compounds are present in relative amounts with respect to each other to form a eutectic composition mixture. The coating includes at least two discrete phases arranged in an interpenetrating three-dimensional microstructure.

The invention discloses an environmental barrier-infrared stealth integrated coating capable of coating the surface of a non-oxide fiber reinforced non-oxide ceramic matrix composite material. The coating has a multi-layer superposition structure, and the multi-layer superposition structure comprises a silicon bonding layer, an anti-oxidation layer and a low infrared emissivity/encapsulation layerin sequence from the inside to the outside, wherein the anti-oxidation layer is a mullite single coating or a mullite/BSAS composite coating, and the low infrared emissivity/encapsulation layer is aBi2O3-ZnO-based glass coating containing a noble metal filler. The invention also provides a composite material containing the coating and a preparation method of the composite material. The environmental barrier-infrared stealth integrated coating provided by the invention adopts the multi-layer superposition structure, thermal expansion coefficients of each functional layer gradually and slowlychange, so that thermal mismatch among the layers is weakened, and the coating has excellent thermal shock resistance.

A process for synthesizing the powder of titanium carbonitride includes such steps as proportionally mixing C-contained mixture, TiO2 fused salt and binder, die pressing to become balls, heating at 600-1800 deg.C for 30-120 min under protection of A2 or N2, and natural cooling.