Sinter-Brazing of Carbides to P/M Steel

摘要

This study has investigated sinterbonding of carbide layers to traditional iron-based P/M parts during the sintering process. Materials selection trials led to further study with the Cr_3C_2-BNi5 system in vacuum, H_2 and N_2/H_2 atmospheres. The coating is created by first applying the carbide with a small amount of braze mixed in, then applying the braze powder on top. During the P/M steel sintering cycle, the braze melts and infiltrates the porosity of the carbide layer, and bonds it to the steel substrate. Spray application and electrophoretic deposition were investigated as potential application methods for this process.