摘要:
The present invention relates to a cutting tool for metal machining with improved wear properties, comprising a cutting tool substrate of cemented carbide, cermet, ceramics or a super hard material, and a wear resistant coating, wherein the wear resistant coating comprises a PVD Ti—Si—C—N layer, and a method of making thereof.
摘要:
There is disclosed a honeycomb structure including a honeycomb structure section including: porous partition walls to divide and form a plurality of cells which extend from one end surface to the other end surface and become through channels of a fluid; and an outer peripheral wall positioned in an outermost periphery. The partition walls and the outer peripheral wall contain silicon carbide particles as an aggregate, and silicon as a binder to bind the silicon carbide particles, thicknesses of the partition walls are from 50 to 200 μm, a cell density is from 50 to 150 cells/cm2, an average particle diameter of silicon carbide as the aggregate is from 3 to 40 μm, and a volume resistivity at 400° C. is from 1 to 40 Ωcm.
摘要翻译:公开了一种蜂窝结构体,其包括蜂窝结构部分,该蜂窝结构部分包括:多孔分隔壁,用于分隔并形成从一个端面延伸到另一端面的多个单元,并且通过流体通道; 以及位于最外周的外周壁。 分隔壁和外周壁包含碳化硅颗粒作为骨料,硅作为粘合剂以结合碳化硅颗粒,分隔壁的厚度为50-200μm,孔密度为50-150个/ cm 2,作为骨料的碳化硅的平均粒径为3〜40μm,400℃下的体积电阻率为1〜40Ω·cm。
摘要:
A turbine airfoil component assembly for use with a turbine engine including a attachment assembly having an inner surface defining a cavity. The attachment assembly includes a metal alloy substrate. An airfoil assembly is at least partially positioned within the attachment assembly and extends outwardly from the attachment assembly. The airfoil assembly includes a ceramic matrix composite (CMC) substrate. A reaction barrier coating is disposed over at least a portion of the airfoil assembly. The reaction barrier coating is positioned between the attachment assembly and the airfoil assembly.
摘要:
Produced is a silicon carbide-coated carbon base material in which a silicon carbide coating is densely and uniformly formed on the surface of a carbon base material, such as graphite. A production process includes the steps of: preparing a carbon base material the surface of which has basal plane sites of an SP2 carbon structure with no dangling bond and edge plane sites of an SP2 carbon structure with a dangling bond; and reacting the surface of the carbon base material with SiO gas in an atmosphere at a temperature of 1400° C. to 1600° C. and a pressure of 1 to 150 Pa to form silicon carbide, whereby the carbon base material coated with silicon carbide is produced.
摘要:
A honeycomb structure includes a porous silicon carbide honeycomb fired body and a silicon-containing oxide layer. The porous silicon carbide honeycomb fired body has at least one cell wall defining a plurality of cells extending along a longitudinal direction of the silicon carbide honeycomb fired body. The plurality of cells is provided in parallel with one another. The silicon carbide honeycomb fired body contains silicon carbide particles. The silicon-containing oxide layer is provided on a surface of each of the silicon carbide particles. The silicon-containing oxide layer has a thickness of from about 5 nm to about 100 nm measured with an X-ray photoelectron spectroscopy.
摘要:
A method of inhibiting oxidation of a porous carbon-carbon composite is disclosed and comprises the steps of: (a) contacting the carbon-carbon composite with an oxidation inhibiting composition comprising phosphoric acid or an acid phosphate salt, at least one aluminum salt, and at least one additional metal salt, the oxidation inhibiting composition penetrating at least some of the pores of the carbon-carbon composite; and (b) heating the carbon-carbon composite at a temperature sufficient to form a deposit from the oxidation inhibiting composition within at least some of the penetrated pores of the carbon-carbon composite. The foregoing oxidation inhibiting composition and carbon-carbon composites treated by the foregoing method are also disclosed.
摘要:
The present invention relates to a cutting tool for metal machining with improved wear properties, comprising a cutting tool substrate of cemented carbide, cermet, ceramics or a super hard material, and a wear resistant coating, wherein the wear resistant coating comprises a PVD Ti—Si—C—N layer with a compositional gradient, and a method of making thereof.
摘要:
Articles transparent to infrared radiation and resistant to impact and wear are provided. The article comprises a substrate and a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface. The composite coating comprises a first phase and a second phase. The second phase has a higher resistance to erosive wear than the first phase. The coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition.
摘要:
A method of inhibiting oxidation of a porous carbon-carbon composite is disclosed and comprises the steps of: (a) contacting the carbon-carbon composite with an oxidation inhibiting composition comprising phosphoric acid or an acid phosphate salt, at least one aluminum salt, and at least one additional metal salt, the oxidation inhibiting composition penetrating at least some of the pores of the carbon-carbon composite; and (b) heating the carbon-carbon composite at a temperature sufficient to form a deposit from the oxidation inhibiting composition within at least some of the penetrated pores of the carbon-carbon composite. The foregoing oxidation inhibiting composition and carbon-carbon composites treated by the foregoing method are also disclosed.
摘要:
The invention relates to a method of producing a composite comprising nanofibres or nanotubes on a porous β-SiC substrate, said method comprising the following steps: (a) a catalyst for growing nanotubes or nanofibres is incorporated into said porous β-SiC substrate or into an SiC precursor; (b) carbon nanotubes or nanofibres are grown from a mixture comprising hydrogen and at least one hydrocarbon; and (c) optionally, said carbon nanotubes or nanofibres are converted to SiC nanofibres. This composite may be used as a catalyst or catalyst support.