α-Al_2O_3在高温氢中的稳定性研究

Stability of α-Al_2O_3 in High Temperature Hydrogen Atmosphere

热核聚变堆阻氚渗透涂层不仅要有低的氚渗透性能,还需要有高硬度和高电阻率以及长期服役可靠性等。因此,保持阻氚渗透涂层材料在高温氢中工作的稳定性是非常重要的。α-Al2O3材料是一种典型的阻氚涂层材料,本研究对α-Al2O3材料在高温氢中的稳定性研究,发现α-Al2O3材料在高温氢气氛中的晶体结构和电学性能都很稳定。但力学性能经过一段时间的氢处理后有所下降,单晶样品的显微硬度从1600 kgf/mm2下降到了1200 kgf/mm2,陶瓷样品的硬度从1100 kgf/mm2下降到了900 kgf/mm2。

In fusion reactors, tritium permeation barriers should obtain properties of low tritium permeability, high hardness and electrical resistivity and so on. Therefore, the stability of α-Al_2O_3 is extremely vital for the fabrication of high performance tritium permeation barriers. In the present study, the stability of α-Al_2O_3 in high temperature hydrogen atmosphere was investigated. The result shows that the crystal structure and electrical properties of α-Al_2O_3 were very stable. The mechanical properties of α-Al_2O_3 were decreased through hydrogenation. The single crystal samples decreased from 1600 kgf/mm^2 to 1200 kgf/mm^2, and the ceramic samples decreased from 1100 kgf/mm^2 to 900 kgf/mm^2.