A study has been made of the metallurgical reactions that control the diffusion bonding of WC–Co hardmetal butt-joints interlayered with Ni, Co, and steel at 1300°C. Vapour transport appears to make a significant contribution to the growth of the bonded regions during the early stages of the process, and the rates of growth are in reasonable agreement with predictions from sintering theories for single component systems. The chemical reactions that occur at the bond interface with Co and steel interlayers are sensitive to differences in the C contents of the interlayers and of the hardmetal binder phase. With low C interlayers the hardmetal near the interface is transformed to an η phase structure.
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