|About this Abstract
||MS&T21: Materials Science & Technology
||Late News Poster Session
||P1-5: Oxidation Protection of AlN/BN via Al18B4O33
||Celia S. Chari, Katherine T. Faber
|On-Site Speaker (Planned)
||Celia S. Chari
The popularity of boron nitride (BN) as a high-temperature ceramic used in aerospace and automobile applications has heightened the demand to study how its volatile and highly-reactive oxidation product (B2O3) affects the chemical and mechanical properties of ceramic systems. There have been no detailed investigations on the role of B2O3 in systems like AlN-BN, a composite material of interest in aerospace applications. This study explores the oxidation of AlN-BN ceramics and the subsequent changes that occur due to the formation of ceramic aluminum borate whiskers. We investigate the influence of B2O3 on the oxidation kinetics of AlN; the varying microstructure and chemical composition of aluminum borate whiskers grown from 1000 °C to 1300 °C; and the changing mechanical behavior of AlN-BN composites exposed to high-temperature oxidative environments. Ultimately, this study provides insight into the oxidation kinetics of AlN-BN ceramics and suggestions for an expanded role of B2O3 in ceramic composites.