Abstract
We studied the sintering behavior of No powder compacts with an addition of boride alloy powders and Ni powders. These boride alloys are CrB, TiB2 and WB which have high decomposition temperature. The results of this experiment are as follows:
1)Though relative densities of sintered No powder compacts with an addition of boride alloy powders slightly rise up, these boride alloy powders do not disintegrate at sintering temperature.
2)The liquid phase produces in matrices of No powder compacts with supplementary addition of Ni powder at sintering temperature and promotes the densification.
3)Two endothermic peaks in DTA curve denote points of liquid phases. We infer that the endothermic peak at low temperature side is the transient liquid phase, because the liquid phase produces temporarily at parts of the matrix in heating up to melting point. The other endothermic peak corresponds to the melting point of No powder compact.
4)WB alloy powder in No powder compacts with an supplementary addition of Ni powder decomposes at lower temperature than that of WB boride compound.
