放電焼結法で作製したAl-Si複相合金の乾式摺動特性に及ぼすSi粒径と体積率の影響

倉本英哲　隠岐貴史　松木一弘^*　柳沢　平^*
　　　　　　　　　　

　Al-Si複相合金において、乾式摺動特性(比摩耗量、摩擦係数)に与えるSi粒径および体積率の影響を明らかにするために、放電焼結法によってSi粒径および体積率の異なるAl-Si複相合金を作製し、乾式での摩耗試験を行った。得られた結果は以下のように要約される。
　Si粒径および体積率は大きくなるほど、摩擦係数および比摩耗量ともに小さくなり、また、Si粒径が小さいほどSi体積率の増加の影響が強くなることが分かった。ただし、Si粒径が大きすぎる場合、粒子の割れ等の影響により比摩耗量はSi体積率の増加に伴い増加する。

　In order to investigate the influence of Si-particle of Si-particle diameter and volume fraction of Al-Si composite on dry wear properties, specific wear rate and friction coefficient, the composites with various Si-particle diameters and volume fractions were made by spark sintering, and dry wear tests of the composites were performed. The results obtained were summarized as follow:
　It was confirmed that specific wear rate and friction coefficient decreased with increasing Si-volume fraction and average paticle diameter, and influence of Si-volume fraction tends to become stronger, as Si-particle average diameter was smaller. However, in case Si-particle diameter is too large, specific wear rate increases with increasing Si-volume fraction under the influences of Si-particle's crack.