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

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...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2018-01, Vol.21 (6), p.1
Main Authors: Guedes-Silva, Cecilia Chaves, Rodas, Andrea Cecilia Dorion, Silva, Antonio Carlos, Ribeiro, Christiane, Carvalho, Flávio Machado de Souza, Higa, Olga Zazuco, Ferreira, Thiago dos Santos
Format: Article
Language:English
Subjects:
Aluminum oxide
Apatite
Biocompatibility
Biological properties
Biomedical materials
Body fluids
Ceramics
Ceramics industry
Composition
Densification
ENGINEERING, CHEMICAL
Fracture toughness
In vitro methods and tests
Liquid phase sintering
Liquid phases
MATERIALS SCIENCE, MULTIDISCIPLINARY
Mechanical properties
METALLURGY & METALLURGICAL ENGINEERING
MG63 cells
Modulus of elasticity
Osteoblasts
SBF
Silicon dioxide
Silicon nitride
sintering
Substitute bone
Surgical implants
Theoretical density
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Summary: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-Si3 N4 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.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2018-0266