硼化钽（TaB）高温高压烧结体硬度的研究

Studies of the hardness for the sintered tantalum boride (TaB) at high temperature and high pressure

摘要:

采用国产DS6×800T铰链式六面顶压机技术，对过渡金属TaB粉末进行了高温高压烧结，并采用金刚石菱形压痕法对TaB维氏硬度进行了测量。在加载负荷为29.4 N时，烧结压力为4 GPa，烧结温度分别为900和1100 ℃时，测试得到TaB陶瓷的硬度分别为7.7±0.4和 10.5±0.7 GPa。说明在同一压力条件下，温度越高致密性越好，通过阿基米德法，计算得到了TaB的相对密度为13.5 g/cm3。

Abstract:

Tantalum boride has been sintered under high temperature and high pressure (HTHP) conditions by using a DS6×8 MN cubic press device, and the Vickers hardness of TaB has been measured by using a diamond indentation method. Under the applied load of 29.4 N, our test gave the Vickers hardness of TaB are 7.7±0.4 and 10.5±0.7 GPa, at 4 GPa and the temperatures of 900 and 1100 ℃, respectively. Our result shows that the density becomes better with the increasing temperature under the same pressure. By using the Archimedes method, we calculated the relative density of 13.5 g/cm3 for TaB.