材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
放射性粒子を含まないタングステン合金焼結材の高温強度特性および機能性評価
山本 慎一溝部 雅恭宮下 幸雄武藤 睦治
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2020 年 69 巻 12 号 p. 869-874

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In order to find the alternative tungsten alloys to the radioactive Thoria-Tungsten alloy (ThO2-W), the carbide added tungsten alloys (HfC-W and TaC-W) were fabricated by the sintering process. Emission current density was measured to evaluate thermal electron emission property. The thermal electron emission current density of HfC-W was the highest among TaC-W, ThO2-W and W. Tensile tests were carried out at room temperature and elevated temperature of 1573 K and 1773 K. Particles added tungsten alloys showed higher strength compared to tungsten alloy without particles. Grain growth might be suppressed by adding particles, particularly in carbides. Carbides, HfC and TaC distributed among grain boundary could effectively suppress grain growth during sintering and high temperature testing. The highest tensile strength with higher stability of mechanical properties at elevated temperature was obtained in HfC-W among TaC-W, ThO2-W and W. Therefore, it could be concluded that HfC-W would be one of the most promising thoria-free tungsten alloys. Thermal electron emission property and high temperature tensile property were also evaluated in sintered ThO2-W alloy and forged ThO2-W alloy which experienced forging process followed by sintering process. Electron emission current density and tensile strength at room and elevated temperatures were almost comparable in the ThO2-W alloys regardless forging process.

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