| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Powder and Ceramic Materials Science
|
| Presentation Title |
Diamond Graphitization and Its Effect on Hardness of Diamond Particulate Ceramic Composites |
| Author(s) |
Jerry Lasalvia, Anthony A. DiGiovanni, Kristopher D. Behler, William T. Shoulders, Scott D. Walck |
| On-Site Speaker (Planned) |
Jerry Lasalvia |
| Abstract Scope |
Diamond-ceramic composites fabricated by low pressure/high temperature methods are attractive materials due to their high values for stiffness, hardness, and thermal conductivity coupled with the potential for large sizes and complex shapes. One challenge to optimizing their properties is minimizing diamond graphitization. In this study, we examined the effects of hot-pressing temperature and time on the graphitization of diamond particulates in a monomodal diamond-SiB6 composite. Diamond-SiB6 powder mixtures with a diamond content of 25 vol% were hot-pressed between 1600oC-1700oC for 60-120 mins under flowing high-purity Ar and 48 MPa. In addition to determining densities, phases, and microstructures, we used Raman and scanning/transmission electron microscopy to characterize the diamond/ceramic interface and estimate graphite interlayer thicknesses. The effects of graphite interlayer thickness on hardness was determined by measuring variations in hardness with hot-pressing parameters. These findings and experimental procedures will be discussed. |
| Proceedings Inclusion? |
Planned: |