アルミニウム合金のスラリーエロージョンに及ぼすけい砂粒子濃度と合金組織形態の影響

抄録

  Slurry erosion experiments were conducted focusing on the sand grain concentration of silica sand in slurry, composition forms and mechanical properties of materials, and surface roughness and surface state of the wear surface after slurry erosion test using as sample materials, the aluminum alloys of the Al-Si alloy, which is a dispersion hardening material, and Al-Mg alloy, which is a solution hardening material, for which different hardening methods are applied. The erosion form changed with changes in the concentration of the sand grains in the slurry, and changed to one in which cutting wear increased as the sand particle concentration increased. As for slurry erosion phenomenon, the mass decreasing rate was found to change depending on the compressive-strength of the material, but it depends on material composition when the compressive-strength is the same. Excellent slurry erosion resistant characteristics were obtained with the solution hardening type alloys below their solid solubility limit for erosion statuses of both impingement wear and cutting wear. The wear surface was smooth with less irregularities than other materials. Moreover, roughness of the wear surface after the slurry erosion decreased the smaller was the mass decrease rate, resulting in the smooth surface with less irregularities. The slurry erosion mechanisms for each sample were also discussed based on these experimental results.