Microstructure, mechanical properties and in vitro biological behavior of silicon nitride ceramics
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The bioinert surface of silicon nitride ceramics led us to investigate the additions of SiO2, CaO and
Al2O3 in order to aid the liquid phase sintering and improve the mechanical properties and biological
behavior of the final materials. The sintered materials reached ca. 97% of theoretical density and total
α→β-Si3N4 transformation. The samples had relatively high values of fracture toughness while their
elastic modulus values were lower than those of conventional silicon nitride ceramics. Apatite deposits
were observed on the surfaces analyzed after SBF (simulated body fluid) immersions, suggesting
their bioactivity. Osteoblasts proliferation and calcified matrix were also detected as response to cells/
materials contact. This combination of properties suggests that all studied compositions are promising
for applications in biomedical devices. Moreover, compositions with alumina additions and higher silica
content had better in vitro biological behavior, densification and mechanical properties, suggesting
greater potential to be used in bone substitute devices.
Como referenciar
GUEDES-SILVA, CECILIA C.; RODAS, ANDREA C.D.; SILVA, ANTONIO C.; RIBEIRO, CHRISTIANE; CARVALHO, FLAVIO M. de S.; HIGA, OLGA Z.; FERREIRA, THIAGO dos S. Microstructure, mechanical properties and in vitro biological behavior of silicon nitride ceramics. Materials Research, v. 21, n. 6, 2018. DOI: 10.1590/1980-5373-MR-2018-0266. Disponível em: http://repositorio.ipen.br/handle/123456789/29311. Acesso em: 30 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.