Development of Fe-based composite materials with a high thermal conductivity

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656554
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: Hokkaido University
• Principal Investigator: HASHIMOTO Naoyuki 北海道大学, 工学(系)研究科(研究院), 准教授 (50443974)
• Co-Investigator(Kenkyū-buntansha): SASAKI Katsuhiko 北海道大学, 大学院工学研究院, 教授 (90215715)
• Co-Investigator(Renkei-kenkyūsha): MUKAI Shin 北海道大学, 大学院工学研究院, 教授 (70243045)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 熱伝導性 / 構造材料 / 照射効果 / 複合材料 / 機械的特性

Outline of Final Research Achievements

Development of iron-based composite materials with a high thermal conductivity was focused in this study. The powder of pure iron and a ferritic/martensitic steel were sintered with carbon nanofiber (CNF), carbon nanotube (CNT), and Cu. The thermal conductivity of the sintered pure iron with 30wt% CNF exhibited 1.3 times higher than that with no CNF. Furthermore, the use of 2D aligned CNF resulted in 2.5 times higher thermal conductivity. Hardness test revealed relatively higher hardness in this composite material. While, the tensile strength was decreased due to weakness of interface between base metal and CNF. In addition, the stability of CNT under electron irradiation was investigated from RT to 600oC. Structure of CNT seemed to be stable at higher irradiation temperatures. While, the widening of the graphene layer and/or the amorphization was observed at relatively lower temperatures, suggesting that a threshold temperature on stability of CNT would exist under irradiation.

Free Research Field

核融合炉工学