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J. Korean Ceram. Soc. > Volume 34(5); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(5): 483.
Al-합금의 단열섬유판 반응침투에 의한 $Al_2O_3$-세라믹스의 형성
동의대학교 재료공학과
Formation of $Al_2O_3$-Ceramics by Reactive Infiltration of Al-alloy into Insulation Fiber Board
Al2O3/metal composites were fabricated by oxidation and reaction of molten Al-alloy into two types of commercial Al2O3-SiO2 fibrous insulation board. The growth rate, composition and microstructure of these materials were described. An AlZnMg(7075) alloy was selected as a parent alloy. Mixed polycrystalline fiber and glass phase fiber were used as a filler. The growth surface of an alloy was covered with and without SiO2. SiO2 powder was employed as a surface dopant to aid initial oxidation of Al-alloy. Al-alloy, SiO2, fiber block and growth inhibitor CaSiO3 were packed sequentially in a alumina crucible and oxidized in air at temperature range 90$0^{circ}C$ to 120$0^{circ}C$. The growth rate of composite layer was calculated by measuring the mass increasement(g) per unit surface($textrm{cm}^2$). XRD and optical microscope were used to investigate the composition and phase of composites. The composite grown at 120$0^{circ}C$ and with SiO2 dopant showed rapid growth rate. The growth behavior differed a little depending on the types of fiber used. The composites consist of $alpha$-Al2O3, Al, Si and pore. The composite grown at 100$0^{circ}C$ exhibited better microstructure compared to that grown at 120$0^{circ}C$.
Key words: DIMOX process, $C_4$, $Al_2O_3$ composites, AlZnMg-alloy, Fibrous insulation board
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