Silicon nitride ceramics with SiO2, SrO and Al2O3 additions for bone replacements
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2018
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INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62.
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The excellent mechanical properties of silicon nitride ceramics combined with
their osseointegration ability and good image characteristics have increased their
application potential as orthopedic and dental implants. In this work, we
investigated the densification, microstructure and mechanical properties of silicon
nitride with SiO2, SrO and Al2O3 additions (90Si3N4-6SiO2-4SrO, 90Si3N4-
6SiO2-3.86SrO-0.14Al2O3, 80Si3N4-10SiO2-10SrO, 80-Si3N4-10SiO2-
9.625SrO-0.375Al2O3, 80Si3N4-12SiO2-8SrO, 80-Si3N4-12SiO2-7.7SrO-
0.3Al2O3, in wt.%). This oxides combination should aid the sintering process and
promote an intergranular phase with great in vivo reactivity in view of its
importance in the new bone formation process. Hence, six different compositions
were prepared by the conventional sintering method. Samples were ground,
pressed and sintering at 1815o C for 1 hour under nitrogen atmosphere. The
apparent density, phase and grain distributions as well as the hardness and
fracture toughness were determined by means of Archimedes’ method, scanning
electron microscopy (SEM), X-ray powder diffraction (XRD) and Vickers’ method.
Also, in vitro test of cytotoxicity was performed for a preliminary biological
evaluation. The results shown that samples reached ca. 97% of theoretical
density and total beta-Si3N4 transformation. Hardness and fracture toughness
values of 10 GPa and 7 MPa.m1/2, respectively, were obtained for all samples
which were non-cytotoxic, suggesting their great potential for bone replacements
in orthopedic surgeries and implantology.
Como referenciar
NASCIMENTO, S.F.; RODAS, A.C.D.; CARVALHO, F.M.S.; HIGA, O.Z.; GUEDES-SILVA, C.C. Silicon nitride ceramics with SiO2, SrO and Al2O3 additions for bone replacements. In: INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62., June 17-21, 2018, Foz do Iguaçu, PR. Abstract... p. 24-24. Disponível em: http://repositorio.ipen.br/handle/123456789/29680. Acesso em: 30 Dec 2025.
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.