La_2O_3弥散增强钨合金面对等离子体材料及其高热负荷性能

Tungsten Alloys Strengthened with Dispersed La_2O_3 and its Heat Flux Performance

本论文通过粉末冶金方法制备La2O3弥散增强钨合金面对等离子体材料并对其进行了组织性能和电子束热负荷性能的分析。结果显示La2O3弥散增强相抑制钨粒子长大效果显著,而且使W-1wt.%La2O3合金材料的抗弯强度提高了约35.7%。同时,W-1wt.%La2O3也表现出较好的热负荷性能,能够承受6MW/m2热负荷功率密度;在更高热负荷条件下,较高的表面温度导致La2O3出现熔化及W-1wt.%La2O3合金材料表面出现微裂纹等损伤,因此面对等离子体材料直接水冷对延长材料使用寿命和提高热负荷性能是十分重要的。

Tungsten alloy plasma facing material strengthened with dispersed La2O3 particles was prepared by means of powder metallurgy method. Its strengthening effects were evaluated and heat flux performance of W-1wt. %La2 O3 alloys was tested in the electron beam facility. The results indicate that the growth of tungsten particles was held back by La2 O3 particles not only in the process of sintering and heat flux tests. La2O3 particles enhance the strength of tungsten with a factor of 35. 7%, and W-1wt. % La2O3 alloy shows the better thermal performance, which can withstand the heat flux of 6MW/m^2. However, due to the higher surface temperature, surface micro-cracks and melting were found at the higher heat flux. Therefore, the directly cooling of W-1wt. % La2O3 plasma facing material is very necessary to improve its lifetime and the heat flux performance.