| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder Materials Processing and Fundamental Understanding
|
| Presentation Title |
Sintering Mechanism for Polycrystalline Diamond |
| Author(s) |
Randall M. German |
| On-Site Speaker (Planned) |
Randall M. German |
| Abstract Scope |
Sintering concepts for mass transport and bonding of contacting grains are applied to the creation of polycrystalline diamond. In the presence of high pressure and high temperature, liquid cobalt facilitates solution-reprecipitation where interface surface defects limit the growth rate. The rate limiting kinetic step is the growth of dislocation spirals on the diamond surface. Calculations on the bonding rate, neck size, and level of strengthening are compatible with observed behavior. Improved sinter bonding is evident when excessive surface defects are introduced, leading to confirmation of pretreatments for the diamond particles in terms of increased surface sites and use of small (nanoscale) multiple modal mixtures of diamonds. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Powder Materials, Process Technology, High-Temperature Materials |