| 摘要 |
1,209,291. Bearings. CLEVITE CORP. 1 Jan., 1969 [4 Jan., 1968], No. 125/69. Heading F2A. [Also in Division C7] A strip of bearing material is made in a process comprising the following steps: (a) spreading a layer of powder Cu and Sn or Cu and bronze to form 1-2% Sn on a steel strip, (b) sintering at about 1800‹ F. and cooling to 600-750‹ F., (c) casting molten Pb base babbitt containing Sn on to the strip at 600-650‹ F. to give 5-6À5% Sn, (d) Quickly cooling the strip. Sintering, cooling and casting are carried out in a reducing atmosphere and casting is such that the hard Cu-Sn alloy layer formed is not more than 0.0002 inch thick. The babbitt preferably has a Sn content of 6-10% and the cast metal should solidify in less than 15 seconds. Fig. 1 shows the powder, application, sintering, cooling, casting and cooling zones. The excess molten babbitt layer may be removed by wiper 32 and then quenched. The composite strip may then be marked conventionally. Strip is used as sleeve bearings in cast. |
