Influence of LiF on the Sintering of Si3N4 Ceramics Containing SiO2–CaO–Al2O3
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This study investigates the influence of LiF on the sintering behavior of Si3N4 ceramics with SiO2–CaO–Al2O3 at the eutectic
composition. Compositions containing 90 wt.% Si3N4 were sintered at 1650–1815 °C for 1 hour. The ceramics were characterized
in terms of density, microstructure, and hardness. At 1650 °C, the β/(α+β)-Si3N4 ratio rose from 28.4 % (0 wt.% LiF) to 63.7%
(2 wt.% LiF), exceeded 98 % at 1700 °C, and reached 100 % at ≥ 1770 °C. In LiF-free samples, higher sintering temperatures
resulted in a higher relative density (95.6 ± 0.4%) and hardness (12.99 ± 0.42 GPa). LiF improved densification and hardness at
low content and sintering temperature, yielding 89.4 ± 0.3 % relative density and 9.71± 0.42 GPa hardness (1 wt.% LiF) compared
to 84.1 ± 0.5 % and 6.78 ± 0.29 GPa (0 wt.% LiF), both at 1650 °C. At higher temperatures, LiF decreased both properties, likely
due to its tendency to evaporate.
Como referenciar
CORREA, W.T.; SILVA, R.O.; FERREIRA, T.S.; CARVALHO, F.M.S.; GUEDES-SILVA, C.C. Influence of LiF on the Sintering of Si3N4 Ceramics Containing SiO2–CaO–Al2O3: Densification, Microstructure, and Mechanical Properties. Cerâmica, v. 71, p. 1-5, 2025. DOI: 10.1590/CXYG9533. Disponível em: https://repositorio.ipen.br/handle/123456789/49832. Acesso em: 27 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.