Abstract
AlN/BN ceramic composites are materials of interest for high-temperature applications because of their low elastic modulus and high thermal shock resistance. Concerns of side products that could form, due to the oxidation of BN into reactive B2O3, motivate the study of the influence of B2O3 on the oxidation of AlN and AlN/BN. This investigation explores such an effect by comparing the oxidation kinetics of AlN with that of B2O3-coated AlN, offering insight into how liquid B2O3 films provide AlN with improved protection against oxidation at temperatures from 1200 to 1300 °C. These concepts are extended to AlN/BN in oxidative environments. We discuss the formation of Al18B4O33 whiskers from B2O3 and Al2O3 and analyze how the microstructure evolves into hollow crystals with prolonged exposure to high-temperatures. Ultimately, this study provides a novel perspective on the oxidation of AlN/BN and serves as a guide to understanding the morphological evolution of Al18B4O33.
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