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Journal of the Korean Ceramic Society 1998;35(9): 923. |
| 실리카 소결체와 용융 알루미늄과의 반응에 의한 $Al_2$O$_3$/Al 복합체의 제조 |
| 정두화, 배원태1 |
포항산업과학연구원 내화재료연구팀
1경상대학교 무기재료공학과 |
| Al2O3/Al Composites Fabricated by Reaction between Sintered SiO2 and Molten Al |
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| ABSTRACT |
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Al2O3/Al composites were produced by displacement reaction method which was carried out by imm-ersing the sintered silica preform which was prepared form fused silica powder in molten aluminu. an ac-tivation energy of 94kJ/mole was calculated from Al-SiO2 reaction data in 1000-130$0^{circ}C$ temperature range With increase of reaction temperature the alumina particle in the Al2O3/Al composites produced with pur metal Al showed grain growth and the growth of alumina particle in Al2O3/Al composite produced by using of Mg contained Al alloy was inhibited. The flexural strength of Al2O3/Al composites produced at 100$0^{circ}C$ showed the highest value as 393 MPa. Flexural strength of the composite fabricated at 85$0^{circ}C$ showed higher deviation than that of the composite produced at above 100$0^{circ}C$ Low flexural strength of the composite fa-bricated at 120$0^{circ}C$ due to the growth of pore and alumina particle size. The hardness of composites de-pended on alumina content in Al2O3/Al composite decreased with increasing of aluminium content in case the same alumina content and increased with increasing of silicon content in composite. |
| Key words:
Displacement reaction, Fused silica, Preform, Al$_2$O$_3$/Al composite, Aluminium. |
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