材料科学
陶瓷
抗弯强度
维氏硬度试验
金属陶瓷
微观结构
金属
相(物质)
热压
冶金
复合材料
化学
有机化学
作者
Mark M. Opeka,James A. Zaykoski
出处
期刊:Meeting abstracts
日期:2016-09-01
卷期号:MA2016-02 (11): 1238-1238
标识
DOI:10.1149/ma2016-02/11/1238
摘要
Multi-phase materials in the Ta-Hf-C system were investigated to identify the properties of ceramic-metal (“cermet”) compositions. Eight two- and three-phase ceramics on the Ta 2 C-HfC, Ta 2 C-“TaHf”, and Ta-HfC composition lines were prepared from the elemental powders by hot-pressing at 2000°C. They were characterized for phase composition with XRD, microstructure using SEM, four point flexural strength, Vickers hardness, and oxidation testing in air at 600 -1500°C. Two-phase compositions with metal and monocarbide solid solutions exhibited the highest strengths of approximately 800 MPa yet showed the lowest Vickers hardness of 3.5 GPa. The only single phase ceramic investigated, Ta 2 C, exhibited a very low strength of 114 MPa yet a very high hardness of 15.9 GPa. Other compositions exhibited strength and hardness values within these ranges. Despite the presence of the metal phases, no plasticity was observed in the flexural testing at room temperature. All compositions had good oxidation resistance up to 1000C. The Hf-rich compositions exhibited modest oxidation resistance up to nearly 1500°C, while the Ta-rich ceramics behaved much more poorly and oxidized rapidly above 1000°C.
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