High-Temperature Oxidation Behavior of 10 vol% AlN/Al₂O₃ Composites

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  • High-Temperature Oxidation Behavior of 10 vol% AlN/Al<sub>2</sub>O<sub>3</sub> Composites

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<p>Alumina composites dispersed with 10 vol% AlN particles are prepared by commercial α-Al2O3 and AlN powder. The pulsed electric current sintering is used to densify the bulk samples. The high-temperature oxidation experiments are conducted at temperatures ranging from 1200 to 1350°C for 6, 12 and 24 h in the air environment. The internally oxidized zone (IOZ) is developed from the sample surface to consist of the Al2O3 matrix with small closed pores. The growth of IOZ obeys the parabolic law, which means the rate-controlling process is mass transport in IOZ. The high-temperature oxidation behavior of 10 vol% AlN/Al2O3 is compared with the 10 vol% Ni/Al2O3 composites. The differences in the microstructure at IOZ and the diffusion of oxygen through the Al2O3 matrix grain boundaries dependence on the oxygen partial pressure are discussed for understanding the high-temperature oxidation behavior of both composites.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (12), 2776-2781, 2023-12-01

    公益社団法人 日本金属学会

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