| 초록 |
The ZrC layer instead of SiC layer is a critical and essential layer in TRISO coated fuel particles since it is a protective layer against diffusion of fission products and provides mechanical strength for the fuel particle. In this study, we carried out computational simulation before actual experiment. With the simulation results, we deposited the ZrC layers on the SiC/graphite substrate through CVD process. SiC films have different microstructures which have granular and faceted structure with deposition temperature. According to deposition temperature and input gas ratio, microstructures, preferred orientation and adhesive strength of deposited ZrC layers were changed. Mechanical characteristics of the samples were also analyzed by nano indentation method. The ZrC/SiC/graphite showed better mechanical properties such as hardness and elastic modulus than SiC/graphite substrate. The ZrC layer showed improved mechanical properties for fabricating TRISO coated fuel particle with high stability. |
