Abstract:
Die Erfindung betrifft einen keramischen Schichtverbund (1), umfassend ein keramisches Substrat (3) aus einer Nichtoxid- Keramik. An seiner Oberfläche umfasst der keramische Schichtverbund (1) eine keramische Schicht (7), die eine große spezifische Oberfläche aufweist. Die Erfindung betrifft weiterhin ein Verfahren zur Herstellung eines keramischen Schichtverbundes (1).
Abstract:
Sintered non-oxide ceramic filter bodies of high strength and permeability, having pores in a size range particularly suitable for gas (e.g. diesel engine exhaust) filtration, are produced by firing filter preforms comprising selected mixtures of coarse and fine non-oxide particles to sinter the particles into porous ceramic filter bodies having a plurality of parallel inlet (10) and outlet channels (11). The high structural integrity of the preforms results from the extrusion of viscous plastic pastes of controlled viscosity at extrusion pressures of at least 30 bar and extrusion velocities of 60 mm to provide extrudates free of cracking and other defects.
Abstract:
A ceramic part having a surface exposed to the interior space, the surface having been shaped and plasma conditioned to reduce particles thereon by contacting the shaped surface with a high intensity plasma. The ceramic part can be made by sintering or machining a chemically deposited material. During processing of semiconductor substrates, particle contamination can be minimized by the ceramic part as a result of the plasma conditioning treatment. The ceramic part can be made of various materials such as alumina, silicon dioxide, quartz, carbon, silicon, silicon carbide, silicon nitride, boron nitride, boron carbide, aluminum nitride or titanium carbide. The ceramic part can be various parts of a vacuum processing chamber such as a liner within a sidewall of the processing chamber, a gas distribution plate supplying the process gas to the processing chamber, a baffle plate of a showerhead assembly, a wafer passage insert, a focus ring surrounding the substrate, an edge ring surrounding an electrode, a plasma screen and/or a window.
Abstract:
A ceramic material is surface treated by contacting the surface of a 312 ternary ceramic material with a surface-modifying compound selected from carburization agents, silicidation agents, nitridation agents and boronization agents, at an elevated temperature of at least about 600 DEG C for a period of time sufficient to provide a surface reaction layer of at least about one micron in thickness in the surface-treated material, preferably having a surface hardness in excess of about 6 GPa. A product made by the method of this invention is also disclosed having a surface hardness in excess of about 6 GPa, preferably at least about 10 GPa.
Abstract:
According to the present invention there is now provided a body of cemented carbide (C), Si3N4 or another ceramic material, coated by at least one CVD or PVD diamond (B) or cBN layer with a chromium nitride (A), -carbide or -carbonitride layer. The chromium containing layer is outside the diamond layer, which in case of more than one diamond layer is the outermost diamond layer of the coating.
Abstract translation:根据本发明,现在提供了由至少一种CVD或PVD金刚石(B)或cBN层涂覆有氮化铬(A),碳化物或碳化物的碳化物(C),Si 3 N 4或另一种陶瓷材料体 碳氮氧化物层。 含铬层在金刚石层之外,在多于一个金刚石层的情况下是涂层的最外层金刚石层。
Abstract:
An open truss structure includes a plurality of ceramic truss members integrally cast in the form of a three-dimensional, lightweight, monolithic truss. The truss structure may be an integral part of a ceramic mirror substrate that supports a precision mirror surface. A dissolvable core used to form the truss with a slip casting method can be made by forming a plurality of internal passages in a suitably-shaped piece of a nonporous material. The nonporous material becomes the dissolvable core and the internal passages form the integral truss members when filled with a liquid-containing ceramic slip. The nonporous material used to make the dissolvable core is capable of dissolving at a temperature below the freezing point of the liquid in the ceramic slip.