The oxidation behavior of dense TiB2 specimens was investigated. Hot-pressed TiB2 with 2.5 wt% Si3N4 as a sintering aid was exposed to air at temperatures between 800° and 1200°C for up to 10 h. The TiB2 exhibited two distinct oxidation behaviors depending on the temperature. At temperatures below 1000°C, parabolic weight gains were observed as a result of the formation of TiO2(s) and B2O3(l) on the surface. The oxidation layer comprised two layers: an inner layer of crystalline TiO2 and an outer layer mainly composed of B2O3. When the oxidation temperatures were higher than 1000°C, gaseous B2O3 was formed along with crystalline TiO2 by the oxidation process. In this case, the surface was covered with large TiO2 grains imbedded in a highly textured small TiO2 matrix.
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2001 Jan 1|
ASJC Scopus subject areas
- Ceramics and Composites