|About this Abstract
||MS&T21: Materials Science & Technology
||Additive Manufacturing of High and Ultra-High Temperature Ceramics and Composites: Processing, Characterization and Testing
||Investigation of Oxidation Behavior of ZrB2-SiC Composites under Different Partial Pressures of Oxygen
||Rubia Hassan, Rishabh Kundu, Kantesh Blaani
|On-Site Speaker (Planned)
ZrB2 composites with two different SiC particle sizes (D50 ~ 30 µm and ~5 µm) were processed using spark plasma sintering. Densification of ~ 89 and ~ 98 % was obtained for coarse (ZSC) and fine (ZSF) SiC reinforced composites, respectively. The oxidation behavior of the composites tested at 1500 °C for 3 hours under two pO2 viz. 0.21 atm and 2*10-5 atm showed easier oxygen influx through ZSC forming thicker silica layer (~ 9-94 µm) which could protect the bulk for longer duration at 0.21 atm. In the case of ZSF, thinner silica layer (~ 4 µm) was formed. Thickness of layers in both the composites increased with decreasing pO2, signifying rapid oxidation taking place at lower pO2. ZSF at 2*10-5 atm possessed finer ZrO2 particles on the surface resulting in higher oxidation resistance. Thus, a trade off in the SiC particle size is required based on practical application.
||Planned: Other (journal publication, etc.; describe below)