|About this Abstract
||MS&T23: Materials Science & Technology
||Manufacturing and Processing of Advanced Ceramic Materials
||Reaction Flash Sintering of Ti0.5Zr0.5N and Ti0.5Al0.5N Ternary Metal Nitrides
||Suprabha Das, Andriy Durygin, Vadym Drozd, Md Shariful Islam Sozal , Jesse Smith, Zhe Cheng
|On-Site Speaker (Planned)
This study aims to demonstrate reaction flash sintering (RFS) for two powder mixtures - TiN-ZrN (both conducting) and AlN-TiN (TiN conducting but AlN insulating), targeting ternary metal nitrides (TMN) of Ti0.5Zr0.5N and Ti0.5Zr0.5N, respectively. A constant DC electrical field of ~50 V/cm and pressure of ~15 MPa at room temperature triggers RFS without pre-heating, and the entire process finishes in a few minutes. Both ex situ XRD and in situ synchrotron studies are carried out to track the phase evolution during RFS and subsequent cooling. Although both systems have a miscibility gap extending to high temperature, uniform Ti0.5Zr0.5N solution formed in RFS persists upon cooling, while (Ti, Al) N solid solution formed at high temperature goes through a quick phase separation in the cooling process. The final products’ microstructure as well as oxidation resistance and mechanical properties are characterized by TGA/DSC, SEM/EDS, Vickers indentation methods.