echanical properties and in vitro bioactivity of silicon nitride ceramics with SiO2, CaO, and MgO addition

Autor(es)

Sona Filho, Celso Ricardo ^[1] ; de Souza Carvalho, Flavio Machado ^[2] ; Guedes-Silva, Cecilia Chaves ^[1]

Afiliação do(s) autor(es)

^[1] Inst Pesquisas Energet & Nucl, IPEN, CNEN SP, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Dept Mineral & Geotecton, USP, Inst Geociencias, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS; v. 110, n. 3 SEP 2021.
• Citações Web of Science: 0

Resumo

Silicon nitride ceramics with SiO2, CaO, and MgO as sintering aids were investigated in view of biomedical applications. In the current study, samples with four different compositions were pressureless sintered at 1750(degrees C) for 1 h under a nitrogen atmosphere. The samples were evaluated concerning densification, microstructure, mechanical properties, and in vitro bioactivity. Microstructures with elongated beta-Si3N4 grains dispersed in an intergranular phase and with densities from 78.77 to 97.14% of the theoretical density were obtained. Higher contents of SiO2 resulted in the best densification and mechanical properties. Besides, replacements of CaO by MgO in the initial compositions affected Young's modulus and in vitro bioactivity. Considering the samples with relative density higher than 94.14%, those with lower values of Young's modulus had lower SiO2/MgO ratios. After immersion in SBF (Simulated Body Fluid), the samples with high porosity and/or partial replacements of CaO by MgO had their surfaces coated with a layer rich in calcium and phosphorus, morphologically similar to hydroxyapatite. Hence, producing silicon nitride ceramics with the potential to be used as orthopedic implants must consider ideal amounts of additives. In this article, the best combination of mechanical properties and mineralization capability was reached by the composition with low content of MgO, and high content of SiO2 and CaO. (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