Designing oxidation resistant ultra-high temperature ceramics through the development of an adherent native thermal barrier
We present a design concept for developing ZrB2-SiC-AlN composites with enhanced oxidative stability at ultra-high temperatures (∼2000 °C) and low pressures (100 Torr). The oxidative stability of these materials arises from a protective silica based scale. However, active oxidation of SiC above 1700 °C presents a challenge, which we circumvent through the in-situ growth of a zirconia layer that serves as a thermal barrier, ensuring that the effective temperature at the zirconia/Si rich subscale is less than the active oxidation temperature. The design concept is validated by a series of ultra-high temperature oxidation experiments under static as well as cyclic conditions.
This is a manuscript of an article published as Ouyang, Gaoyuan, Matthew F. Besser, Matthew J. Kramer, Mufit Akinc, and Pratik K. Ray. "Designing oxidation resistant ultra-high temperature ceramics through the development of an adherent native thermal barrier." Journal of Alloys and Compounds 790 (2019): 1119-1126. DOI: 10.1016/j.jallcom.2019.03.250. Posted with permission.