ABSTRACT

The F82H, which is one of reduced activation ferritic/martensitic steels, is a strong candidate structure material for fusion reactor because of its satisfactory mechanical property and high swelling resistance in the operating temperature range. One disadvantage of F82H would be its low thermal conductivity as a structural material for divertor. In this study, we have fabricated several F82H-based composite materials by the spark plasma sintering to improve its thermal conductivity by adding tungsten and/or copper wires. F82H-20 vol.% W and F82H-10 vol.% W-10 vol.% Cu composites included reaction layers at the interface between tungsten wire and F82H matrix, resulting in the decrease in ductility and tensile strength because of the formation of tungsten carbide. On the other hand, F82H-20 vol.% Cu composite, sintered for 120 min at 1000°C, included no reaction layers and showed the highest thermal conductivity with a high relative density. Furthermore, it showed a great tensile property, which is comparable to that of the original F82H.

摘要

F82H是一种低活化铁素体/马氏体钢，因其良好的机械性能和在工作温度范围内的高抗溶胀性而成为聚变反应堆强有力的候选结构材料。F82H 的一个缺点是其作为偏滤器结构材料的低导热性。在这项研究中，我们通过放电等离子烧结制造了几种 F82H 基复合材料，以通过添加钨和/或铜线来提高其导热性。F82H-20 vol.% W 和 F82H-10 vol.% W-10 vol.% Cu 复合材料在钨丝和 F82H 基体之间的界面处包含反应层，由于钨的形成，导致延展性和抗拉强度下降碳化物。另一方面，F82H-20 vol.% Cu 复合材料，在 1000°C 下烧结 120 分钟，不包括反应层，并显示出最高的热导率和高的相对密度。此外，它还显示出与原始 F82H 相当的拉伸性能。