Abstract
Cr3C2-Ni cermets are sintered to nearly full density at temperatures of 1525-1575K. These temperatures are too high to form a sintered body on various steel substrates successfully by powder metallurgical technique, so-called sinter-bonding. This technique requires that the sintering of the cermet and the bonding to the steel occur simultaneously. The problem of high sintering temperature can be overcome by an addition of WB to Cr3C2-Ni cermets, which leads to densification at a lower temperature than 1450K. By adding WB, the sintering temperature is considerably reduced, and full density can be achieved within the capability of a sinter-bonding technique.
The sintering behavior of ternary Cr3C2-Ni-WB cermets was investigated by means of dilatometric and differential thermal analysis. A liquid phase formed by WB-Ni eutectic-like reaction (1300K) prior to Cr3C2-Ni reaction (1500K) promotes densifi-cation.
