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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Late News Poster Session
Presentation Title N-30: Synthesis and Characterization of Next-generation Multiphase Silicon Nitride-based Ceramics
Author(s) Katherine Ann Brizzolara, Curtis Martin, Kevin Hemker
On-Site Speaker (Planned) Katherine Ann Brizzolara
Abstract Scope Structural ceramics for use in extreme environments must meet stringent requirements. The current study was undertaken to show that multi-phase Si2ON2/Si3N4/BN can be created using a novel two-step processing technique. Nitridation in a tube furnace turns Si, SiO2 and BN powders into α-Si3N4 and then β-Si3N4, while maintaining BN in the matrix. We will contrast nitridation of Si3N4 from silicon powder versus silica powders. Calcining the product in a graphite furnace can lead to Si2ON2, which has improved mechanical properties due to elongated grains. The details of Si2ON2 nucleation and growth are being studied and optimized. The plate-like BN grains further improve the toughness of the overall material. Moreover, processing the multi-phase ceramic in this manner facilitates net-near shape processing, eliminating the need for hot pressing.
Proceedings Inclusion? Undecided
Keywords Ceramics, High-Temperature Materials, Powder Materials

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