| 摘要 |
<p>1,167,197. Coating by thermal decomposition. GENERAL ELECTRIC CO. Dec.19, 1966 [Jan.6, 1966], No.56716/66. Heading C7F. [Also in Division C1] Refractory porous bodies of open, interconnected cellular structure, having a carbonaceous foam substrate, being produced by the thermal decomposition of an organic foam, and a refractory coating on said substrate of pyrolytic graphite or silicon, a pyrolytic refractory metal of Groups IV, V and VI (e.g. Hf, Mo, Ta, W, Ti and Zr), a pyrolytic compound of such a metal (e.g. boride, nitride, carbide), or a graphite-boron alloy. They may be prepared by thermally decomposing an organic foam, and vapour-depositing a refractory coating as above on to the substrate so produced. The substrate may be produced by impregnating a porous organic structure (e.g. polyurethane, polystyrene or cellulose foams) with an organic thermosetting resin, as binder and heating the impregnated structure in a non- oxidizing atmosphere to remove all non-carbonaceous constituents. The vapour deposition may then be effected at subatmospheric pressure, and elevated temperature. The metal coatings may be produced by vapour deposition from halogenated starting materials e.g. WF 6 .</p> |
