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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 21, n. 6 2018.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 15/02265-7 - Development of ceramic composites of Si3N4-SiO2-CaO system for bone compatibility
Grantee:Cecília Chaves Guedes e Silva
Support Opportunities: Regular Research Grants