Fracture toughness of hydroxyapatite/mica composite, packed hydroxyapatite, alumina ceramics, silicon nitride and -carbide.
By using the fracture toughness estimation method based on two-dimensional map, it was found that the ductility of the high porosity hydroxyapatite/mice composite was comparable with silicon carbide. It was measured to be higher than that of packed hydroxyapatite. Alumina ceramics with more than 96% aluminium oxide showed a higher fracture toughness than the composite material. When bending strength was compared, the strength of the composite was two or three times lower than that of packed hydroxyapatite and much lower than the other studied materials. The composite material showed high porosity, which in turn gives it a lower bending strength. However, the high porosity is more favourable for biocompatibility.
Department of Materials Science and Engineering, Teikyo University, Utsunomiya, Japan.
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EG
Nordström
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Yokobori
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T
Yokobori
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Y
Aizawa
D000535:Aluminum / Q000737:chemistry*; D000538:Aluminum Silicates / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D017554:Carbon Compounds, Inorganic / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D006245:Hardness Tests; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D017655:Silicon Compounds / Q000737:chemistry*; D013718:Tensile Strength
D000538:Aluminum Silicates; D001672:Biocompatible Materials; D017554:Carbon Compounds, Inorganic; D016876:Metal Ceramic Alloys; D017655:Silicon Compounds; D017886:Durapatite; D000535:Aluminum; C032734:silicon nitride; C011934:mica; C022088:silicon carbide