Fabrication and Characteristics of Hypereutectic Prealloyed Al-Si Powders by Gas Atomization Process

摘要

The hypereutectic prealloyed Al-Si powders were prepared by gas atomization process. The microstructure and compacting ability of the atomized Al-Si powders were investigated. With increasing the gas pressure of the atomization, the average powder size and oxygen content were decreased. The size of primary eutectic Si particles in the as-atomized powders was about 8～10μm. As-atomized powders were hot-pressed into a cylindrical shape. Relative density of the hot-pressed samples was achieved about 96～99% of theoretical density. Some properties of the samples were evaluated in this paper.