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Regulating grain growth and sintering mechanism of Si3N4 ceramics: Three effects achieved simultaneously by controlling the amount of CaF2 additive

Ning W, Cao X, Han G, Kashkarov EB, Travitzky N (2026)

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Publication Type: Journal article

Publication year: 2026

Journal

Book Volume: 46

Article Number: 118224

Journal Issue: 9

DOI: 10.1016/j.jeurceramsoc.2026.118224

Abstract

This study explores the regulation of grain growth and sintering mechanism of self-toughening Si3N4 simply by controlling the amount of CaF2 added. CaF2 was transformed into CaO in-situ via its reaction with SiO2 on the surface of Si3N4. This simultaneously achieved three effects: inhibiting the secondary phase CaSiO3 generated easily by direct addition of CaO; in-situ generated CaO regulates the grain growth and densification of Si3N4 with high aspect ratio; formation of CaF2-CaO low viscosity liquid phase facilitates sintering and densification process. All these can be achieved by adjusting the amount of CaF2. The reaction mechanism of CaF2 as a novel sintering additive in Si3N4 ceramics was explored for the first time through thermodynamic theoretical calculation and phase diagram. This work provides a new combination method for the design and development of easy-to-control, efficient and cost-effective sintering additives for Si3N4 and other high temperature ceramics.

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How to cite

APA:

Ning, W., Cao, X., Han, G., Kashkarov, E.B., & Travitzky, N. (2026). Regulating grain growth and sintering mechanism of Si3N4 ceramics: Three effects achieved simultaneously by controlling the amount of CaF2 additive. Journal of the European Ceramic Society, 46(9). https://doi.org/10.1016/j.jeurceramsoc.2026.118224

MLA:

Ning, Wei, et al. "Regulating grain growth and sintering mechanism of Si3N4 ceramics: Three effects achieved simultaneously by controlling the amount of CaF2 additive." Journal of the European Ceramic Society 46.9 (2026).

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