Microstructure, Mechanical Properties and in vitro Biological Behavior of Silicon Nitride Ceramics

Autor(es)

Guedes-Silva, Cecilia Chaves ^[1] ; Dorion Rodas, Andrea Cecilia ^[2] ; Silva, Antonio Carlos ^[1] ; Ribeiro, Christiane ^[2] ; de Souza Carvalho, Flavio Machado ^[3] ; Higa, Olga Zazuco ^[1] ; Ferreira, Thiago dos Santos ^[1]

Afiliação do(s) autor(es)

^[1] Comissao Nacl Energia Nucl, Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed ABC UFABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Alameda Univ S-N, BR-09606045 Sao Bernardo Do Campo, SP - Brazil

^[3] Univ Sao Paulo, Inst Geociencias IGC, Rua Lago 562, BR-05508080 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 21, n. 6 2018.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 15/02265-7 - Desenvolvimento de compósitos cerâmicos do sistema Si3N4-SiO2-CaO para compatibilidade óssea
• Beneficiário: Cecília Chaves Guedes e Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular