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Journal of the Korean Ceramic Society 1998;35(12): 1316. |
| VC 첨가가 Ti(CN)계 써메트의 미세구조 및 기계적 성질에 미치는 영향 |
| 안성용, 강신후 |
| 서울대학교 재료공학부 |
| Effect of VC Addition on the Microstructure & Mechanical Properties of Ti(CN)-based Cermet |
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| ABSTRACT |
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The amount of VC and C/N ratio in Ti(CN) was varied to investigate the effect of VC addition on the mi-crostructural change in Ti(CN)-Ni system. As the amount of VC addition increases in Ti(C0.7N0.3)-20Ni sys-tem a complete solid solution was observed in Ti(C0.7N0.3)-20Ni-25VC system. It implies that the ratio of the dissolution rates of Ti(C0.7N0.3)to that of VC is nearly 2:1 at the sintering conditions used in this study. It was found from the experiments that the system composed of the Ti(C0.7N0.3) phase exhibits a rimless structure and relatively small amount of solid solution. That is among Ti(C0.7N0.3) phase exhibits a rimless structure and relatively small amount of solid solution. This is among Ti(C1-xNx) phases the dissolution rate of Ti(C0.3N0.7) is the lowest. Also fracture toughness(KIC) of the cermet was measured by indentation method. Attentions were paid to crack propagation path to look for a dominant fracture mode and to cor-relate it with fracture toughness values. The fracture toughness was relatively high with the addition of VC content. But the addition of a large VC content reduced the overall toughness of the cermet. This result is explained with the difference in fracture mode. |
| Key words:
Dissolution rate, Rimless structure, Fracture toughness(KIC), Indentation, Fracture mode |
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