抄録
High tin aluminum alloy bearings can seize when used with nodular cast iron shafts in automotive engines. In an attempt to remove burrs and transferred aluminum debris which cause the seizure from the surfaces of the shafts, hard Si particles are dispersed in the alloy bearing, which provides much higher seizure resistance than in the conventional aluminum alloy bearings. The hard Si particles show mild lapping action to the shaft surfaces, as well as removal of transferred aluminum debris on them. To maximize the action of hard Si particles, the effects of amount and shape of the Si particles are studied. The effects of shape is critical and it is found that the seizure resistance becomes far higher when the particles are lumpy. The flaky Si particles are broken during the test and the removing action is minimized leading to a lower seizure resistance.
