방전플라즈마 소결법을 이용한 고밀도 탄화 붕소 제조 및 기계적 특성
Mechanical properties of B4C ceramics fabricated by a spark plasma sintering process
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방전플라즈마 소결법을 적용하여 탄화붕소 세라믹스를 제조하여 그 소결 특성, 미세 구조 및 기계적 특성을 평 가하였다. 탄화붕소의 소결에 방전플라즈마 소결법을 적용하여 소결 조제의 첨가 없이 전통적인 소결법보다 낮은 온도에서 99 % 이상의 완전 치밀화된 소결체를 제작할 수 있었으며, 탄화붕소 분말의 메탄올 세척을 통하여 분말 표면에 형성되어 있는 B2O3 상을 사전에 제거함으로써 결정립의 조대화를 방지하여 균일한 미세구조의 형성을 유도할 수 있었으며 결과적 으로 탄화붕소 소결체의 기계적 특성을 향상시킬 수 있었다. 특히 파괴인성의 경우 메탄올 세척을 통하여 30 % 이상의 물 성 향상을 달성하였다.綽
Abstract
B4C ceramics were fabricated by spark plasma sintering process and their sintering behavior, microstructure and mechanical properties were evaluated. Relative density of B4C ceramics were obtained by spark plasma sintering method reached as high as 99% at lower temperature than conventional sintering method, in addition, without any sintering additives. The mechanical properties of B4C ceramics was improved by a methanol washing process which can be removed B2O3 phase from a B4C powder surface. This improvement results from the formation of homogeneous microstructure because the grain coarsening was suppressed by the elimination of B2O3 phase. Particularly, fracture toughness of the sintered specimen using a methanol washed powder improved over 30 % compared with the specimen using an as-received commercial powder.
참고문헌 (13)
- "“Process of the production of dense sintered articles of boron carbide”" (1980)
- "“Stoichiometric limits of carbon-rich boron carbide phases”" (1983)
- "“Low temperature hot pressing of boron carbide and its properties”" (1974)
- "“The effect of stoichometry on mechanical properties of boron carbide”" (1984)
- "“Additive effect on sintering of boron carbide”" (1987)
- "Pressureless sintering of boron carbide", 86(9), pp.1468~ (2003)
- "Mechanical properties of pressureless sintered boron carbide containing TiB2 phase", 15(15), pp.1337~ (1996)
- "A computational analysis of the ballistic performance of light-weight hybrid composite armors", 253(2), pp.730~ (2006)
- "“Pressureless sintering and related reaction phenomena of Al2O3-doped B4C”" (1992)
- "“Microstructural coarsening during sintering of boron carbide”" (1989)
- "“Hot-pressing of boron carbide”" (1984)
- "Sintering of boron carbide heat-treated with hydrogen", 85(8), pp.2131~ (2002)
- "“Sintering of covalent solids”" (1976)