Joining of Spheroidal Graphite Cast Iron and Copper Alloy Using Combusion Synthesis Reaction

Abstract

  Joining of copper alloys on spheroidal graphite cast irons is important to enhance the wear resistance of sliding parts. Although the joining is attempted by brazing, inserting, or others, these method have many technical problems. Thus we try to join a spheroidal graphite cast iron and a copper alloy by using Ni/Al mixed compacts, as insert materials, which take place combusion synthesis reaction. As a result, we succeeded in joining a spheroidal graphite cast iron and a copper alloy at 1023K, and succeeded even at a lower temperature of 923K. Advantages inherent to the SHS process for joining include the lower temperature and the shorter time in joining, as compered with conventional diffusion joinings.