Wettability and Interface Reaction of Sn-Cr powder alloy on Poly-crystalline Diamond (PCD)

摘要

In this work, the isothermal wetting of the Sn-Cr powder alloy containing 1.0, 2.0 and 4.0 wt.% Cr on Poly-crystalline diamond (PCD) substrates was investigated using a sessile drop method. The addition of active Cr significantly improved the wettability of Sn-Cr alloy at a temperature above 700 °C, and a minimum contact angle less than 20° was observed between Sn-2wt%Cr alloy and PCD substrate. The interfacial reaction between Sn-2Cr and PCD were strongly dependent on wetting temperature. A thick and continuous layer of chromium carbide was formed as wetting temperature increased from 700 to 750 °C, which consequently enhanced the wettability of Sn-Cr alloy on PCD substrate.