| 摘要 |
434,277. Bearing materials. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.- (Leadizing Co.; 80, East Jackson Boulevard, Chicago, U.S.A.) Feb. 24, 1934, No. 6127. [Class 12 (i)] [See also Group XXII] In a composite bearing element having a facing member of a hardened lead alloy containing not less than 95 per cent lead bonded to a metallic body or backing member, the bonding medium or solder consists of a lead alloy containing between 20 per cent and 30 per cent by weight of tin. The lead alloy of the facing member is hardened by the presence of calcium or sodium or other alkaline earth or alkali metals. Satco metal, Frary metal, and Bahnmetall, the compositions of which are given in the Specification, as well as certain types of Babbitt metal are especially suitable. The surface of the backing member is covered with a corrosive flux and then dipped in the molten solder which is maintained at a temperature between 340 and 370‹ C. The coated backing member is then set up in spaced relation to a mandrel by means of suitable packing strips and the hardened lead alloy at a temperature of not less than 480‹ C. is cast against it. The corrosive flux is preferably a water solution containing 50 per cent to 75 per cent of zinc chloride, though water solutions of zinc chloride with sal-ammoniac or tin chloride may be used. |
