Abstract
In order to develop the iron base sintered alloys for porous bearing having superior properties, effects of chemical composition and sintering temperature on dimensional change, intercommunicating porosity and radial crushing strength of iron-tin and iron-tin-copper compacts were investigated.
The results obtained were as follows:
1) Dimensional change and intercommunicating porosity of iron-tin compacts admixed with 1.0-1.5 wt% tin powder were nearly equal to those of iron compact when they were sintered at 1130-1420K. Radial crushing strength of the iron-tin compacts exceeded that of the iron compact only when sintered at temperatures above 1320K.
2) Dimensional change and intercommunicating porosity of iron-tin-copper compacts admixed with 2.5 wt% tin-copper prealloyed and mixed powders having the Sn/Cu ratio 3:7 were nearly equal to those of the iron compact when they were sintered at about 1160K. Radial crushing strength of the iron-tin-copper compacts sintered at about 1160K was much higher than that of the iron-copper compact sintered at about 1420K.
