A protective barrier coating system including a diffusion barrier coating and an oxidation barrier coating and method for use in protecting silicon-based ceramic turbine engine components. A complete barrier coating system includes a thermal barrier coating of stabilized zirconia and an environmental barrier coating of an alloyed tantalum oxide. The oxidation barrier coating includes a layer of metallic silicates formed on a substrate of silicon nitride or silicon carbide to be protected. The ox...

A fibrous solid carbon manifold assembly and a method for producing the fibrous solid carbon manifold assembly are provided. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. With such a configuration, the number of superfine graphite filaments can be increased mor...

A carbon material is formed by heat-treating a carbonaceous material in a reaction mix of oxides of boron and boron nitride in a nitrogen atmosphere to temperatures of 1600 to 2000.degree. C. The surface of the carbonaceous material is transformed into a carbon material that is resistant to oxidation to temperatures of 900.degree. C., enabling machined components to be utilized for weeks at that temperature. The carbon material is also stable in inert or vacuum environments to temperatures in th...

A flexible graphite sheet material having improved molding characteristics is provided by effecting resin impregnation such that the resin profile across one of the dimensions of the sheet is non-uniform.

A composite ceramic body includes a fiber-reinforced core region containing carbon, and a surface region containing SiC. In order to produce a composite ceramic body having good long-term behavior, the proportion of SiC contained in the body varies continuously, or essentially continuously, from inside the core region towards the surface region.

An expansion graphite sheet of high thermal resistance includes an expansion graphite as a main component, and inorganic thermal resistance particles made of at least one selected from the group consisting of aluminum boride (AlB.sub.2 and/or AlB.sub.12), silicon boride (SiB.sub.6), zinc boric acid (2ZnO.3B.sub.2O.sub.3.3.5H.sub.2O) and phosphorous boride (PB). An exhaust gasket made of the expansion graphite sheet, in addition to the expansion graphite sheet, can exhibit high thermal (oxidizati...

A two-phase glass-like carbon member has, in combination, a porous glass-like carbon base, and a dense glass-like carbon surface layer formed on the porous glass-like carbon base. The porous glass-like carbon base can be formed in a large thickness. The dense glass-like carbon surface layer is superior to the porous glass-like carbon base in gas impermeability, surface hardness and resistance to dusting. The dense glass-like carbon surface layer supplements disadvantages of the porous glass-like...

An aluminum nitride sintered body containing carbon fibers is provided. This aluminum nitride sintered body is obtained by mixing carbon fibers and aluminum nitride together to form mixed powder, molding the mixed powder to form a compact, and heating and sintering the compact in any of a vacuum atmosphere, an inert atmosphere and a reductive atmosphere. By using electric conductivity and shapes with high aspect ratios of the carbon fibers, continuous electrically conductive paths are formed wit...

A number of properties of polygranular carbon bodies can be improved by small quantities of carbon fibers being incorporated in the formulations for production of such bodies. However, it has proven difficult for carbon fibers to be introduced into the green mixture. Therefore, a high-grade coke, preferably needle coke, in accordance with the invention is used to produce the polygranular carbon bodies. This high-grade coke according to the invention contains the carbon fibers simply as a result ...

The present invention provides a conductive material having superior bending property and superior bending resistant property and a method for manufacturing the same. This object is achieved by a conductive material comprising a substrate and a conductive portion formed within the substrate, wherein a change ratio in the electric resistance values before and after a bending resistant property test, in which the conductive portion is bent by 180 degrees and a load of 1 kg/cm.sup.2 is imposed on t...