Abstract
In this study, the effects of the major factors on compaction and densification behavior are investigated for Ti(C, N)-based cermet powders. The relative density equation for green compact of composite powders is modified to predict the green density of Ti(C, N)-based cermet powders prepared under different degrees of pressing pressures, and the theoretical values are found to be in good agreement with experimental results. It has been found that the composite powders with micron-sized particles have a better compatibility than those with nano-sized particles by analyzing the effects of the particle size and purity on the starting mono-powders. It has also been found that the volume shrinkage and porosity of the former are lower than that of the latter. In addition, it shows that high oxygen content has a negative impact on both the compatibility of composite powders and the uniformity of pore size distribution of sintered cermets. It has also been discussed in this study how the pressing parameters such as pressing pressure, pressing temperature, and dwell time influence the resulting cermets. The results indicate that a better compatibity is reached at a pressing rate of 100 mm/min or a pressing temperature of 100°C.
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