Abstract
Using the vacuum mechanofusion apparatus which has been reported, we tried to coat A12O3 core particles with Cu covering particles. Mechanofusion in air and low vacuum induced lower degree of coating promotion, while the mechanofusion in high vacuum and Ar atmosphere gave a higher yield. That is to say, the yield of composite particle was enhanced by decreasing the partial pressure of O2 in the atmosphere. AES analysis for the Cu covering layer of the composite particles showed that the content and the enriched depth of oxygen in the Cu covering layer increased as the pressure of the atmosphere became higher.
