Self-protective Oxidation-resistant Carbon Matrix Materials

1 ． 研究背景。作为高温结构材料的碳材料在惰性气氛下，即使在2500℃高温下也能使用。因此，碳是航空航天关系材料、核反应堆材料和核聚变反应堆材料的理想材料。但碳材料在高温氧化性气氛下存在氧化磨损的缺陷。因此，提高碳材料的抗氧化性的研究被国际上许多研究者所开展。关于材料抗氧化体系被意外破坏后自愈性能的研究报道很少。认为在本研究组中，研究和开发高可靠性的高温结构材料是必要的。研究运作计划。为了共同开发具有抗氧化特性的碳基材料，我们与长崎大学先进碳材料试验组和中科院先进碳材料课题组进行了合作。金属研究所在碳基体中加入碳化硼和碳化硅。具体地说，制备了两组成分不同的碳基材料，考察了材料和陶瓷附加物对抗氧化性能的影响，并阐明了抗氧化机理。之后，我们还致力于进行材料设计，在合作中开发具有自我修复功能的碳基材料。研究结果。制备了两国成分不同的碳基材料，并对每种复合材料在干燥气氛下的氧化特性等物理性能进行了评价，在氧化后陶瓷颗粒通过形成表面氧化保护膜分散的碳/陶瓷复合材料中，表现出优异的抗氧化性，并阐明了表现机理。然后，制作了这种材料设计的复合材料，成功地开发出了抗氧化性能和力学性能优异的碳基材料，并明确了其具有自愈性能。少

1 . The research background. The carbon material used as high temperature structural material can be used even in 2500'C high temperature under the inert atmosphere. Therefor carbon is a material expected as aero space relation material, nuclear reactor and material for nuclear fusion reactor. However, the carbon material has the defect which wears out under the high-temperature oxidizability atmosphere by the oxidation. Therefore, the research in which the oxidation resistance to carbon material is improved is carried out by many researchers in the world. There is seldom the report which discussed the self-healing property when oxidation resistance system of the material was damaged by accident. It is considered that in this study group, research and development of the high temperature structural material with the high reliability are necessary.2. The research operation plan. In order to develop carbon base material with the oxidation resistance characteristics jointly, we, Advanced M … More aterial Laboratory group of Nagasaki Univ. and Advanced Carbon Material Research Group of the Chinese Academy of Science. Institute of Metal Research added boron carbide and silicon carbide to the carbon matrix. Concretely, the carbon base material of which the composition differs in both group is produced, and the material and ceramic additional effect on oxidation resistance is examined well-informed, and the oxidation-resistant mechanism is clarified. Afterwards, we also aimed at carrying out the material design, and developing carbon base material with the self-repair function in the cooperation.3. The research result. As the result that it produced the carbon base material of which the composition differs in both countries and evaluated physical property such as oxidation characteristics under the drying atmosphere on each composite material, carbon/ceramics composite material in which the ceramic particle dispersed by forming surface oxidation protective film after the oxidation, the excellent oxidation resistance was manifested, and it clarified the expression mechanism. Next, this composite material of material design was produced, and it succeeded in the development of the carbon base material which is excellent in oxidation resistance and mechanical property, and it was clarified to have the self-healing property. Less