| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
2023 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-57: Sintering and Densification Mechanism of HfB2 Based Ultra High Temperature Ceramics for Hypersonic Space Vehicles |
| Author(s) |
Shruti Dubey, Kantesh Balani |
| On-Site Speaker (Planned) |
Shruti Dubey |
| Abstract Scope |
HfB2-based ultra-high temperature ceramics (UHTCs) are used as protective tiles for nose cones and leading edges of the re-entry vehicles. The present work assesses the effect of temperature on densification and sintering kinetics of HfB2-based ceramics consolidated via spark plasma sintering. Pure HfB2 was sintered at temperatures ranging from 1750–1950°C under a constant uniaxial pressure of 50 MPa. Maximum densification of ~98% was achieved at > 1850°C. Moreover, the sintering kinetics have been studied utilizing a densification data and employing a model based on the creep deformation of materials. The stress exponent (n) < 2 corresponds to temperatures between 1750–1850°C, demonstrating that diffusion is the major densification mechanism. However, n was > 2 above 1850°C, indicating a transition from diffusion-based to dislocation-based densification mechanisms. This study establishes a solid foundation for a comprehensive understanding of the sintering mechanism and the rationale behind densification in HfB2 based UHTCs. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Ceramics, High-Temperature Materials, Mechanical Properties |