Abstract
In view of the susceptibility of TiB2 to oxidation, the thermal stability of monolithic TiB2 and Al2O3-TiB2 composite was investigated. The temperature at which TiB2 ceramic starts to oxidize is about 400°C, oxidation kinetic being controlled by diffusion up to T≈900°C and in the first stage of the oxidation at 1000 and 1100°C (up to 800 and 500 min, respectively), and by a linear law at higher temperatures and longer periods. Weight gains of Al2O3-TiB2 composite can be detected only at temperatures above ≈700°C and the rate-governing step of the oxidation reaction is characterized by a one-dimensional diffusion mechanism at T=700 and 800°C and by two-dimensional diffusion at higher temperatures. The composition and morphology of the oxidized surfaces were analysed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 649-653 |
| Number of pages | 5 |
| Journal | Journal of Materials Science |
| Volume | 28 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 1993 |
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Science (miscellaneous)
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Polymers and Plastics