|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Temperature Corrosion of Structural Materials
||Oxidation Resistance of AlN Modified ZrB2 -SiC Ultra High Temperature Ceramics
||Gaoyuan Ouyang, Pratik K Ray, Matthew J Kramer, Mufit Akinc
|On-Site Speaker (Planned)
ZrB<SUB>2</SUB> base ultra high temperature ceramic (UHTC) is the most promising candidate for high temperature structure materials where good thermal stability, oxidative resistance and thermal conductivity are needed. The oxidation resistance of AlN and SiC modified ZrB<SUB>2</SUB> was investigated at several temperatures up to 2000°C via static and cyclic oxidation tests. The formation of Al<SUB>2</SUB>O<SUB>3</SUB> from AlN provided additional oxidation resistance before the coverage of SiO<SUB>2</SUB> scale at 1000°C. At 1600°C, the presence of Al<SUB>2</SUB>O<SUB>3</SUB> as verified by X-ray photoelectron spectroscopy significantly affected the oxidation resistance. ZrO<SUB>2</SUB> crystallites size on the glass changed with the amount of AlN, which suggested a correlation in the scale viscosity with the amount of Al<SUB>2</SUB>O<SUB>3</SUB> formed. At extreme temperature and cyclic conditions as tested by plasma cyclic heating, the presence of Al<SUB>2</SUB>O<SUB>3</SUB> modified SiO<SUB>2</SUB> was found to be very critical to retained the thermal barrier ZrO<SUB>2</SUB> scale for optimum performance.
||Planned: Supplemental Proceedings volume