Spark plasma sintered ZrC-Mo cermets: Influence of temperature and compaction pressure
Spark plasma sintered ZrC-Mo cermets: Influence of temperature and compaction pressure
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DOI：
10.1016/j.ceramint.2016.05.059
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发表时间：
2016-08
影响因子：
5.2
通讯作者：
D. Yung;M. Antonov;I. Hussainova
中科院分区：
文献类型：
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作者：
D. Yung;M. Antonov;I. Hussainova
在ZrC-20重量%Mo金属陶瓷上进行微观结构分析和机械表征，所述金属陶瓷在50或IOOMPa的压制压力下在1600 °C至2100 °C范围内的各种温度下火花等离子体烧结。在所有实验中，复合材料达到约98%的相对密度，致密化后平均晶粒尺寸在1至3.5 µm之间。SPS技术的性质导致更快的致密化速率时，施加更高的压实压力。压实压力的差异在致密化和晶粒结构中产生不同的行为：1900 °C，100 MPa在ZrC中产生过度的晶粒生长; 1600 °C，50 MPa揭示了非常清晰的ZrC晶粒结构和碳化物晶粒之间的Mo扩散; 2100 °C，50 MPa由于微观结构中的Mo相的小簇而表现出最高的总体机械性能。事实上，这种特定的烧结制度给出了最佳的机械值：2231 HV 10和5.4 MPa*m1/2，以及396 GPa杨氏模量。SPS的压制压力对复合材料的性能起着决定性的作用。一个温和的50 MPa的压力导致所有三个机械性能增加，随着烧结温度的升高。相反，较高的100 MPa的压力导致断裂韧性和杨氏模量随烧结温度的升高而降低。
The microstructure analysis and mechanical characterisation were performed on a ZrC-20 wt%Mo cermet that was spark plasma sintered at various temperatures ranging between 1600 and 2100 °C under either 50 or 100 MPa of compaction pressure. The composite reached ~98% relative density for all experiments with an average grain size between 1 and 3.5 µm after densification. The nature of SPS technology caused a faster densification rate when higher compaction pressures were applied. The difference in compaction pressures produced different behaviors in densification and grain structure: 1900 °C, 100 MPa produced excessive grain growth in ZrC; 1600 °C, 50 MPa revealed a very clear ZrC grain structure and Mo diffusion between carbide grains; and 2100 °C, 50 MPa exhibited the highest overall mechanical properties due to small clusters of Mo phases across the microstructure. In fact, this particular sintering regime gave the most optimal mechanical values: 2231 HV10 and 5.4 MPa*m1/2, and 396 GPa Young's modulus. The compaction pressure of SPS played a pivotal role in the composites’ properties. A moderate 50 MPa pressure caused all three mechanical properties to increase with increasing sintering temperature. Conversely, a higher 100 MPa pressure caused fracture toughness and Young modulus to decrease with increasing sintering temperature.