Paper number 1269

IMPROVEMENT OF CAST IRON SURFACE BY USING ALLOY POWDERS ON THE MOLD

Yoshisada Michiura¹, Kimio Nakamura¹, Masayoshi Kitagawa¹, Shigenori Tanabe², Yasuo Horikawa² and Kenji Higashi²

1Kurimoto, Ltd. 1-64, Izumi-2Chome, Suminoe-ku, Osaka, Japan, 559-0023
2Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University,
1-1 Gakuen-cho, Sakai, Osaka, Japan, 559-8531

Summary

For coating functional layer on cast iron, mixed powders which consist of high performance powder and Ni-based alloy powder having low melting point are coated on the mold. By the heat of pouring , these powder layers are densified by a liquid-phase sintering and then jointed with cast iron. The coated cast iron obtained by mixed Fe-Cr alloy and self-fused Ni based alloy has substantial hardness (800/1000HV1) and good resistance to wet abrasion, and also by mixed Ni and Ni-P alloy has soft layer (100/200HV1) coating 10/20%Ni and therefore good corrosion resistance to spraying of 5%NaCl solution.

Keywords

liquid-phase sintering, surface treatment, cast iron, abrasion resistance, corrosion resistance, alloy powder, mold, self-fused.