Journal of the Korean Ceramic Society (한국세라믹학회지)
- Volume 32 Issue 10
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- Pages.1194-1202
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- 1995
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- 1229-7801(pISSN)
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- 2234-0491(eISSN)
Mechanical and Electrical Properties of Hot-Pressed Silicon Carbide-Titanium Carbide Composites
고온가압소결한 SiC-TiC 복합체의 기계적, 전기적 특성
초록
The influences of TiC additions to the α-SiC on microstructural, mechanical, and electrical properties were investigated. Electrical discharge machinability of SiC-TiC composites was also studied. Samples were prepared by adding 30, 45, 60 wt.% TiC particles as a second phase to a SiC matrix. Sintering of SiC-TiC composites was done by hot pressing under a vacuum atmospehre from 1000 to 2000℃ with a pressure of 32 MPa and held for 90 minutes at 2000℃. Samples obtained by hot pressing were fully dense with the relative densities over 99% except 60wt.% TiC samples. Flexural strength and fracture toughness of the samples were increased with the TiC content. In case of SiC samples containing 45 wt.% TiC, the fracture toughness showed 90% increase compared to that of monolithic SiC sample. The crack propagation and crack deflection were observed with a SEM for etched samples after Vicker's indentation. The electrical resistivities of SiC-TiC composites were measured utilizing the four-point probe. The electrical dischage machining of composites was also conducted to evaluate the machinability.
키워드
- SiC-TiC composite;
- Flexural strength;
- Fracture toughness;
- Crack deflection;
- Electrical resistivity;
- Electrical discharge machining