Abstract:
1,158,024. Bearings. WESTINGHOUSE ELECTRIC CORP. 30 Jan., 1967 [16 March, 1966], No. 4381/67. Heading F2A. [Also in Divisions C3, C5 and C7] A self-lubricating bearing comprises the solidified product of a mixture of (a) 4-44% of mercury, gallium or an alloy of gallium with one or more of Pb, In, Sn or Bi and (b) 56-96% of a powdered component consisting of the powdered selenides or sulphides of W, Mo, Nb or Ta, in a total amount of at least 5% based on the total body composition any remaining balance being powdered. Ag or alloys thereof containing at least 90% Ag, Cu or alloys thereof containing at least 90% Cu or resin (e.g. P.T.F.E.) powders. In examples the powders are mixed with the low melting point metal or alloy, the mixture is compacted at 5000-100,000 p.s.i. and cured by heating for 1-24 hours three times at 300- 500‹ F., 600-800‹ F. and 800-1100‹ F. respectively in a neutral or non-oxidizing atmosphere (e.g. Ar).
Abstract:
An annular chromium carbide coating on an annular sealing surface of a stainless steel sealing assembly component for use in a nuclear reactor coolant pump, is treated by encasing at least the chromium carbide coating on the stainless steel sealing surface by applying a metallic cover thereover, evacuating the atmosphere between the cover and the coating on the sealing surface, hot isostatic pressing the stainless steel sealing assembly component and the chromium carbide coating thereon encased by the cover, cooling the sealing assembly component and the coating thereon encased by the cover, and after cooling thereof removing the cover from the coating. The result is a chromium carbide coating on the sealing component substrate densified substantially to it full theoretical density (greater than 99%) and metallurgically bonded by the hot isostatic pressing to the substrate exterior surface.