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Volume 35 Issue 2
Mar 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(2): 021101.
WANG Juwei, ZHANG Zhengang, LIANG Hao, CHEN Haihua. Effects of Sintering Pressure on the Vickers Hardness of TaC[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 021101. doi: 10.11858/gywlxb.20200600
Citation: WANG Juwei, ZHANG Zhengang, LIANG Hao, CHEN Haihua. Effects of Sintering Pressure on the Vickers Hardness of TaC[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 021101. doi: 10.11858/gywlxb.20200600
shu

Effects of Sintering Pressure on the Vickers Hardness of TaC

doi: 10.11858/gywlxb.20200600
  • 1.

    Department of Basic Education, Qinghai University, Xining 810016, Qinghai, China

  • 2.

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China

  • Received Date: 03 Aug 2020
  • Rev Recd Date: 26 Aug 2020
    Abstract
  • To study the effects of the sintering pressure on the mechanical properties of TaC with various grain sizes, nano- and micro-sized TaC powders are sintered at high pressure and high temperature (HPHT) to acquire bulk TaC ceramics under different sintering conditions. Different characterization approaches, such as X-ray diffraction (XRD), are used to observe phase, elements distribution, and indentation state. The observations reveal that the TaC phase is stable during the sintering process and there is no impurity infiltration. Three ceramic samples at the various sintering pressures (3.0, 4.0, 5.5 GPa) are measured by the Vickers hardness tester and their microstructures are also analyzed. The results show that as the sintering pressure increases from 3.0 GPa to 5.5 GPa, the Vickers hardness of Micro-5.5-TaC (21.0 GPa) is higher than that of Nano-3.0-TaC (17.5 GPa) and Nano-4.0-TaC (19.2 GPa). In addition, it is found that 3.0 kg is the most accurate load for measuring the Vickers hardness. This study has a guiding significance for sintering structural ceramics and exploring the Vickers hardness of ultra-high temperature ceramics (UHTCs).

     

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