Effects of WC/TiC addition on the thermodynamic behavior of TiB2-based cermet during sintering process
Source abstract
Abstract
The heat absorption, weight change and exhaust behavior of TiB 2 -based cermet powder mixtures with additions of WC, TiC and WC-TiC were analyzed by a simultaneous thermal analyzer coupled with a mass spectrometer (TG/DSC-QMS). Thermodilatometry was used to investigate the densification behavior due to sintering process of cermets. During the sintering process, the order of degassing is: water vapor, CO 2 released by the reduction of adsorbed oxygen in the raw material powder, CO and CO 2 released by the reduction of surface oxides of Co and Ni powder, WC powder, TiB 2 and TiC powder. The addition of WC, TiC and WC-TiC accelerated the reduction of oxides on the surface of Co and Ni powders, and decreased the temperature point of liquid phase formation in TiB 2-based cermet. WC and TiC dissolved in liquid CoNi binder and then precipitated on the undissolved TiB 2 particles to form a typical core-rim structure during the sintering. This study is expected to lay a solid foundation for the development of high-performance TiB 2-based cermets based on TiB 2-CoNi, TiB 2-WC-CoNi, TiB 2-TiC-CoNi and TiB 2-WC-TiC-CoNi cermets in the future.
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