156 results about "Non oxide ceramics" patented technology

The present invention provides a ceramic substrate which can keep a sufficiently large breakdown voltage even if the pore diameter of its maximum pore is 50 μm or less to be larger than that of conventional ceramic substrates, can give a large fracture toughness value because of the presence of pores, can resist thermal impact, and can give a small warp amount at high temperature. The ceramic substrate of the present invention is a ceramic substrate for a semiconductor-producing / examining device having a conductor formed on a surface of the ceramic substrate or inside the ceramic substrate, wherein: the substrate is made of a non-oxide ceramic containing oxygen; and the pore diameter of the maximum pore thereof is 50 μm or less.

Composites and methods relating to the use of inventive aluminophosphate compounds and films thereof with glass, ceramic and non-oxide ceramic substrates.

The invention relates to a carbon-based polymer composite material capable of being ceramized and a preparation method thereof. The carbon-based polymer composite material is formed by mixing and pressing carbon-based resin, a fiber-reinforced material, a high temperature-resistant coupling agent, aluminium silicate mineral powder and non-oxide ceramic powder, and the carbon-based polymer composite material specifically comprises the following components in parts by weight: 20-50 parts of the carbon-based resin, 10-40 parts of the fiber-reinforced material, 0.5-2 parts of the high temperature-resistant coupling agent, 10-50 parts of the aluminium silicate mineral powder and 1-10 parts of the non-oxide ceramic powder. Compared with the prior art, the composite material disclosed by the invention has the advantages of good thermal protection performance and anti-scour performance; a forming process of the composite material is simple, and aerobic thermal protection and ceramic formationare integrated; the ceramization temperature is lower and the ceramic conversion rate is higher; and the polymer composite material further has the advantages of capability of being formed by the polymer composite material process, strong designability, good mechanical properties at medium and low temperature, high ceramic conversion rate, low thermal weight loss rate, high retention rate of high-temperature strength and the like.

The invention relates to a high-entropy brazing filler metal and a preparation method thereof, and particularly relates to a high-entropy brazing filler metal for brazing non-oxide ceramics and the composite material of the non-oxide ceramics and the preparation method of the brazing filler metal, aiming to solve the problem that the brazing filler metal at the joint of the non-oxide ceramics and the ceramic composite material which are soldered together is unreliable in performance at a temperature higher than 500 DEG C in the prior art. The brazing filler metal comprises the following components in parts by weight: 18 to 24 parts of Ni, 14.3 to 19 parts of Cr, 16.8 to 22.5 parts of Co, 15.9 to 21 parts of Fe, 10.1 to 13.5 parts of Cu, and 0 to 24.9 parts of Ti or TiH2. The preparation method comprises the following steps of: carrying out vacuum melting on the weighed components at the temperature of 1200 to 1800 DEG C, performing linear cutting and carrying out foiling or composite tabletting on the components, so as to obtain the brazing filler metal; or the preparation method comprises the following steps of: carrying out ball-milling on the components in a ball material mass ratio of (12-16):1, and then tabletting and cleaning the components to obtain the brazing filler metal. The strength of the alloy joint obtained by using the method reaches 35 to 71 MPa, and the strength retention of the alloy joint at a high temperature of 800 DEG C exceeds 67%.

A binder-free ceramic feedstock composition for thermal spraying on a surface of an article is provided. The composition comprises: an oxide ceramic powder and a boride and / or carbide ceramic powder. The boride and / or carbide ceramic powders are comprised of micron-sized particles, and the volume content of the oxide ceramic powder is in the range of about 1 to about 85 percent. A method for preparing the binder-free ceramic feedstock and a coated article by a thermal spraying process are also provided.

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.

PCT No. PCT / JP96 / 00546 Sec. 371 Date Sep. 3, 1997 Sec. 102(e) Date Sep. 3, 1997 PCT Filed Mar. 6, 1996 PCT Pub. No. WO96 / 27694 PCT Pub. Date Sep. 12, 1996A composite steel sheet including a steel base member; an undercoat having opposed surfaces and a thickness of 10-750 mu m obtained by spraying one or more spraying materials selected from metals, non-oxide ceramics, oxide ceramics and cermets onto the steel base member. The undercoat has an oxide layer of not less then 0.5 mu m in thickness on one of the opposed surfaces positioned away from said steel base member. A fired topcoat is formed on the oxide layer of the undercoat from a vitreous coating having a linear expansion coefficient of 4-11x10-6 / DEG C.

A ceramic matrix composite material is disclosed having non-oxide ceramic fibers, which are formed in a complex fiber architecture by conventional textile processes; a thin mechanically weak interphase material, which is coated on the fibers; and a non-oxide or oxide ceramic matrix, which is formed within the interstices of the interphase-coated fiber architecture. During composite fabrication or post treatment, the interphase is allowed to debond from the matrix while still adhering to the fibers, thereby providing enhanced oxidative durability and damage tolerance to the fibers and the composite material.

A composite article includes a substrate and a protective layer on the substrate. The protective layer includes a non-oxide ceramic matrix and a refractory phase within the non-oxide ceramic matrix.

Composites and methods relating to the use of inventive aluminophosphate compounds and films thereof with glass, ceramic and non-oxide ceramic substrates.

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 invention relates to a method for preparing titanium nitride ceramic powder, which belongs to the field of the preparation of ceramic powder. A titanium source comprises soluble titanium salt, namely titanium tetrachloride or titanium tetrabromide, and a carbon source comprises glucose, sucrose, citric acid and soluble starch. Nitric acid is used as an oxidizing agent, and urea is used as a fuel; and ammonium nitrate is used as a preparing agent. The mol ratio Ti ;C of the titanium source to the carbon source is 1 to (4-16), and the mol ratio of the nitric acid with the ammonium nitrate to the urea with the ammonium nitrate is (1-12) ;2. Various raw materials are dissolved in water and then are heated at a temperature of between 100 and 600 DEG C, and a solution undergoes a combustion reaction to generate precursors; the precursors are pulverized and then are pretreated for 0 to 10 hours at a temperature of between 200 and 800 DEG C, and then a carbon thermal reduction is carried out for 1 to 10 hours in the atmosphere of flowing nitrogen at a temperature of between 800 and 1,800 DEG C. Follow-up treatment is carried out on products to obtain titanium nitride powder. The titanium source and the carbon source in the precursors of the invention have fine granularity and are uniformly mixed; therefore, the method has good reaction activity and also has the advantages of lowering the temperature of the carbon thermal reduction reaction and improving the reaction rate. The method can prepare nanometer-level non-oxidized ceramic powder with good decentrality.

The preparation process of Si3N4 ceramic with high heat conductivity features the SPS low temperature quick sintering with nitride as sintering assistant to prepare Si3N4 ceramic with high heat conductivity as one kind one non-oxide ceramic. The Si3N4 ceramic with high heat conductivity is prepared with alpha Si3N4 powder and sintering assistant in the ratio of 100 to 2-10, and through mixing and SPS low temperature quick sintering. During the preparation, the material is filled into graphite mold and quickly SPS sintered at 10-100 MPa pressure and 1500-1700 deg.c for 3-30 min. The Si3N4 ceramic has high heat conductivity up to 120W / m.K and high strength including three point breaking strength over 750 MPa.