CONTINUOUS PRODUCTION OF HYPEREUTECTIC AL-SI ALLOY COMPOSITE MATERIAL

摘要

PURPOSE:To produce the wear-resistant material having a homogeneous and fine structure, at low cost by adding a reinforcement to a hypereutectic Al-Si alloy melt, uniformly mixing the materials, and then dropping the mixture onto a polygonal rotor rotating in a heat-resistant vessel at high speed. CONSTITUTION:The hypereutectic Al-Si alloy contained in a crucible 4 is melted by the melting furnace 2 in a vacuum vessel 1. An impeller 8 is inserted into the melt and rotated at low speed, the reinforcement consisting of nonmetallic particles or fibers is added, and the materials are uniformly mixed. The obtained molten composite material is allowed to flow down into a molten composite material agitator 20 through a sprue 15. The molten composite material is dropped onto the rotor 23 rotating around a horizontal shaft 26 at high speed in the heat-resistant vessel 22, and spattered by the rotation and agitation. Consequently, the formed primary Si crystal is crushed. The spattered semi- molten composite material is received by the vessel 22, and discharged as the massive semi-solid aggregate having a homogeneous microstructure. By this method, a wear-resistant hypereutectic Al-Si alloy composite material having excellent mechanical properties is obtained.