| 학회 | 한국재료학회 |
| 학술대회 | 2009년 봄 (05/21 ~ 05/22, 무주리조트) |
| 권호 | 15권 1호 |
| 발표분야 | 구조재료 |
| 제목 | Characterization of High temperature Mechanical properties of CVD-SiC Coating layer for Nuclear fuel particle |
| 초록 | Very High Temperature gas cooled Reactor (VHTR) has been considered as one of the most promising nuclear reactor in the near future because of many advantages including high inherent safety to avoid environmental pollution, high thermal efficiency and the role of secondary energy source. TRIstructural ISOtropic (TRISO) nuclear coated fuel particles used in HTGR are composed of 4 layers as OPyC, SiC, IPyC and Buffer PyC. The significance of SiC coating layer is to maintain the strength of the whole particle from the pressure exerted by gas evolution from inner side of the particle. Various methods have been proposed to evaluate the mechanical properties of SiC coating layer such as flexural strength test, tri-layer test, crush test and internal pressurization test at room temperature. However, few works have been attempted to characterize the mechanical properties of SiC coating layer at high temperature. In this study, nanoindentation test was performed for the analysis of the hardness, modulus and creep properties up to 500°C, and the fracture strength of CVD-SiC coating layers was measured by the micro tensile method up to 700°C. From the results, we can conclude that the hardness and fracture strength are decreased with temperature and no significant change in the modulus is observed with increase in temperature. And, it was observed that the temperature dependent mechanical properties were related to the microstructure of CVD-SiC coating layers. The results obtained from the analysis of temperature dependent mechanical properties for SiC coating layers will be presented and discussed in detail. |
| 저자 | Park, Kwi-Il, Lee, Hyeon-Keun, Kim, Do Kyung |
| 소속 | KAIST |
| 키워드 | TRISO; SiC coating layer; High temperature; Fracture strength; Nanoindentation; Micro tensile test |
