In this paper, the author describes the change of performance of lead alloys for bearing due to silicon content. The specimens were of a generally used bearing alloy (specimen No. 1: Sn 22%, Sb 14%) and other lead alloys (specimen No. 2: Sn 0.15%, Si 0.017%, Sb 3%, No. 3: Sn 3%, Si 0.017%, Sb 6%, No. 4: Si 0.017%, Sb 6%, No. 5: Sb 6%). The diameter of the testing shaft was 19.8 mm, the running load 30 kg, and the revolution of the shaft 780, 910, 1130, 1380, or 1650 rpm. The obtained results were as follow: (1) In compressive stress and hardness tests specimen No. 1 and No. 3 showed better results than the others. (2) In the tests for the coefficient of friction, No. 1 showed better results than the others at lower revolution range, but No. 3 and No. 1 showed the same value at higher revolutions range. (3) In the bearing temperature after 300 mins running, No. 1 showed a lower value than the others in general, but No. 3 showed the lowest at 1650 rpm. (4) In the abrasion weight, No. 1 and No. 3 showed the lowest value at lower revolution range, and No. 1, No. 2, No. 3, all showed the same value at higher revolutions range. By all accounts, the quality of bearing performances of specimen No. 1, and No. 3, were of the same rank. Therefore, if lead alloys for bearing metal contain silicon, tin will be remarkably saved by addition of silicon.
Please do not copy without permission.