抄録
By adding phosphorus to Cu-Sn mixed powders and pressing those at relatively high pressure, the compacts are strengthened at low sintering temperature of about 650°C. Besides, in the case of about 0.8% addition of phosphorus, the compacts swell and their porosity increases.
By utilizing this phenomenon, we produced the bronze type oil impregnated sintered bearings containing a large amount of lead and graphite, which had high strength and high porosity. For example, the bearing added about 12%Pb and 5% C had the radial crushing strength of about 22 kg/mm2 and the oil content of about 21%.
The bearings were driven under the relatively severe running condition (P=20 kg/cm2, N=4, 000 rpm, PV=2, 000 kg/cm2·m/min) for evaluating the bearing performance. And it was found that the bearing which was added proper amounts of lead (about 6%) showed an excellent performance because lead com-pensated the weak formability of solid lubricant film of graphite. However, the bearing which was added excess amounts of lead (about 12%) showed an inferior bearing performance.
