Pyrolytic carbon coated carbon member which is excellent in releasability of the glass

摘要

PURPOSE: To inexpensively obtain a thermally decomposable carbon-coated carbon member having excellent releasability by coating the surface of a substrate of a carbonaceous material with a thermally decomposable carbon and specifying the concentration of boron in the thermally decomposable carbon- coated carbon member. ;CONSTITUTION: In a carbon member which is brought into contact with glass and used, requires releasability from glass and is obtained by coating the surface of a carbonaceous material as a substrate with a thermally decomposable carbon, the concentration of boron in a thermally decomposable carbon-coated carbon member is ≤2ppm to give the objective thermally decomposable carbon- coated carbon member. In order to improve releasability from glass and to prevent separation of fine particles and attachment to glass, a denser coating film is preferable. Therefor, a carbonaceous material having ≤40ppm ash content is preferably used as the substrate to increase density and releasability. Furthermore, by using the substrate having ≤40ppm ash content, the whole impurities in the substrate are thermally diffused to prevent contamination of glass.;COPYRIGHT: (C)1995,JPO