| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
In-situ High Temperature Coefficient of Thermal Expansion of Metal-diborides Through X-ray Diffraction |
| Author(s) |
Fox Thorpe, Elizabeth Sobalvarro Converse, Jesus Rivera, Harry Charalambous, Gabriella King, Wyatt Du Frane, Joshua Kuntz, Scott McCormack |
| On-Site Speaker (Planned) |
Fox Thorpe |
| Abstract Scope |
The coefficient of thermal expansion was determined for a series of metal-diborides (TiB2, ZrB2, HfB2, NbB2, TaB2) in-situ up to 3000°C. In these experiments, solid spherical samples were suspended and rotated by a gas stream through a conical nozzle levitator, heated by a 400 W CO2 laser at beamline 6-ID-D of the Advanced Photon Source at Argonne National Laboratory. The experiments were conducted in ultra-high purity Argon and an Argon-3% Hydrogen mixture to mitigate oxidation at high temperature. X-ray diffraction patterns suitable for Rietveld refinement were collected at 100 ˚C temperature intervals. An analysis of the degree of anisotropy of the thermal expansion was conducted for each of the diborides. A further study on thermal gradients within the samples using in-situ XRD was conducted on TiB2. |