Regulating grain growth and sintering mechanism of Si3N4 ceramics: Three effects achieved simultaneously by controlling the amount of CaF2 additive
| Parent link: | Journal of the European Ceramic Society.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 46, iss. 9.— 2026.— Article number 118224, 11 p. |
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| Other Authors: | , , , , |
| Summary: | Title screen 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 Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.jeurceramsoc.2026.118224 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=685082 |
| Summary: | Title screen 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 Текстовый файл AM_Agreement |
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| DOI: | 10.1016/j.jeurceramsoc.2026.118224 |