| Title | Glass-reinforced hydroxyapatite composites: Fracture toughness and hardness dependence on microstructural characteristics |
| Publication Type | Journal Article |
| 1999 |
| Authors | Lopes, MA, Monteiro, FJ, Santos, JD |
| Journal | BiomaterialsBiomaterials |
| Volume | 20 |
| Issue | 21Exeter, United Kingdom |
| Pagination | 2085 - 2090 |
| Date Published | 1999/// |
| 01429612 (ISSN) |
| article, Biocompatible Materials, Biomaterials, calcium phosphate, Calcium phosphates, ceramics, Composite materials, Composite Resins, Cracks, Durapatite, Evan's equation, Fracture toughness, glass, hardness, hydroxyapatite, Hydroxyapatite-glass composites, Indentation techniques, Kinetics, Laugier equations, material state, mechanical stress, Microscopy, Electron, Scanning, Microstructure, Palmqvist crack systems, Phosphate minerals, porosity, priority journal, Stress, Mechanical, tensile strength, Tricalcium phosphate |
| Fracture toughness and hardness properties of CaO-P 2O
5 glass-reinforced hydroxyapatite composites have been assessed using indentation techniques and results calculated according to Laugier and Evans' equations. Both properties showed to be dependent upon several microstructural characteristics, namely residual porosity and the percentage of secondary β and α tricalcium phosphate phases in the structure of the composites. Composites presented a Palmqvist-type indentation crack system, which is the specific crack system addressed by Laugier's approach. Fracture toughness determinations according to Evan's equation, which is a universal one and adapted to both median and Palmqvist crack systems, did not correlate well with Laugier determinations. Copyright (C) 1999 Elsevier Science Ltd.
Fracture toughness and hardness properties of CaO-P
2O
5 glass-reinforced hydroxyapatite composites have been assessed using indentation techniques and results calculated according to Laugier and Evans' equations. Both properties showed to be dependent upon several microstructural characteristics, namely residual porosity and the percentage of secondary β and α tricalcium phosphate phases in the structure of the composites. Composites presented a Palmqvist-type indentation crack system, which is the specific crack system addressed by Laugier's approach. Fracture toughness determinations according to Evan's equation, which is a universal one and adapted to both median and Palmqvist crack systems, did not correlate well with Laugier determinations.
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