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강보람(Boram Kang),임현미(Hyeonmi Lim),김호석(Hoseok Kim),홍봉근(Bong Geun Hong) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
우주항공재료로 사용되는 탄소/탄소 복합재료는 내열 및 내삭마 특성이 매우 중요하다. 탄소 복합재는 제조 공정, 탄소섬유의 종류, 프리커서 열처리공정에 따라 열 물리적 성질이 달라진다. 본 연구에서는 400 kW 플라즈마 풍동 장비를 이용하여 삭마 특성을 시험하였고, 삼차원 표면 형상 측정기를 이용하여 시험 전 후의 표면 변화를 관찰하였다. 또한 질량 및 표면 조도를 측정하고 미세구조를 관찰 하여 재료의 삭마 특성을 비교 분석하였다. Carbon/carbon composites has been used for aerospace materials because of their good thermal resistance and ablation resistance. The fabrication process, including the choice of fibers, precursor materials, and thermal processing, is the main factor that determines the thermophysical properties of the composites. In this study, ablation properties of two different materials were investigated by using a plasma wind tunnel with the power of 400 kW which produces a supersonic plasma flow and surface changes before/after the test were measured for 3D surface measuring system. Also, we measured mass losses, surface roughness changes and observed morphological changes that result from the ablation and performed the analysis of the materials.
정용환(Yong Hwan Jeong),박정용(Jeong-Yong Park),홍봉근(Bong Geun Hong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The development of the first wall whose major function is to withstand high neutron and heat fluxes is a critical path to fusion power. The materials database and the fabrication technology are being developed for design, construction and safe operation of the fusion reactor. The candidate materials for the first wall application are the reduced activation ferritic martensitic (RAFM) steels, the vanadium alloys and SiC fiber reinforced ceramic SiC composite. The first wall was designed to consist of the plasma facing armor, the heat sink layer and the supporting plates. The joining of the different materials has been the critical issue in the manufacturing of the first wall. In this study, the effects of the joining temperature, the joining pressure and the interlayer have been studied in order to find the optimum joining condition of the first wall.