Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8603, Japan.
Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan.
Sci Rep. 2018 Jan 8;8(1):56. doi: 10.1038/s41598-017-18476-7.
Helium plasma irradiation on metal surfaces leads to the formation of metallic fuzzy nanostructures accompanied by the growth of helium bubbles in metals. The mechanism of the growth process, its impact for fusion devices, and potential application have been explored. Here we show enhanced growth of large-scale fuzz by precipitating additional metallic particles during helium plasma irradiation. The growth rate of the fuzzy structures became orders of magnitude greater than conventional fuzz growth; in an hour of irradiation, 1 mm-thick visible tungsten and molybdenum fuzzy fur structures covered a tungsten metal substrate. Additional precipitation of metallic ions breaks the bottleneck diffusion process; moreover, further acceleration in the growth rate could have occurred if the electric sheath shape was influenced by the grown structure and the electric field that formed around the structure started collecting ions.
氦等离子体辐照金属表面会导致金属绒毛状纳米结构的形成，并伴随着金属中氦气泡的生长。已经探索了生长过程的机制、对聚变装置的影响以及潜在的应用。在这里，我们通过在氦等离子体辐照期间沉淀额外的金属颗粒来显示大规模绒毛状结构的增强生长。绒毛结构的生长速率比传统的绒毛状生长快几个数量级；在辐照 1 小时内，1 毫米厚的可见钨和钼绒毛状毛发结构覆盖了钨金属基底。金属离子的额外沉淀打破了扩散过程的瓶颈；此外，如果电屏蔽形状受到生长结构的影响，并且围绕结构形成的电场开始收集离子，生长速率可能会进一步加快。
