| 摘要 |
1,189,764. Sealing member. FORD MOTOR CO. Ltd. 1 Feb., 1968 [3 Feb., 1967], No. 5118/68. Heading B2K. A sealing member comprises a steel base with a surface layer thereon comprising nickel oxide, calcium fluoride and calcium oxide. An intermediate layer of an alloy of nickel with aluminium or chromium may be present. The intermediate layer may be at least 0.003 inch thick and the surface layer is at least 0.010 inch thick. The surface layer may comprise about 55 to 85% by wt. nickel oxide. The base may be of austenitic stainless steel. The intermediate layer may be applied to an austenitic stainless steel member by means of a torch and a surface layer applied thereto by means of a torch of a product obtained by the reaction in air of nickel oxide and calcium fluoride. The product for the surface layer may be made by milling a mixture of nickel oxide powder with calcium fluoride powder and sintering the mixture in air at a temperature exceeding 2000‹F. The torch is a plasma gun using an inert gas e.g. argon, nitrogen, xenon or helium. The coatings may be applied by flame spraying. |
