| 반응결합 소결에 의한 TiC-Co/Al 복합체의 미세구조 및 기계적 특성 |
| 한인섭, 남기웅1, 정윤중1 |
한국에너지기술연구소 에너지재료연구팀
1명지대학교 공과대학 무기재료공학과 |
| Microstructure and Mechanical Properties of TiC-Co/Al Composites Prepared by Reaction-Bonded Sintering |
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| ABSTRACT |
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The TiC-Co/Al reaction-sintered products were prepared by the infiltration of various Co/Al metal mixture into the preform, and their microstructure, phases, and mechanical properties were investigated. With increasing the atomic ratio of Co/Al, tiC grain shape was changed from spherical to platelet particles, and the grain size increased. The crystalline phases found in the liquid matrix formed by the infiltration of Co/Al metal mixture were determined to be Al5Co2 and AlCo by EDS and XRD, and the two crystalline phases were located dominantly between TiC grains, when the Co/Al atomic ratio was lower than an unity. There was a tendency that the density, bending strength and fracture toughness increase with Co/Al atomic ratio until the infiltrated metal was 100% Co. The maximum value was achieved by the composition containing 100% Co infiltrated metal. The Vickers hardness decreased as Co/Al atomic ratio increased. |
| Key words:
Reaction-bonded sintering, TiC-CoAl composite, Ostwald ripening process, Metal infiltration |
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