1. Fracture Toughness of Microplasma-Sprayed Hydroxyapatite Coating by Nanoindentation.
- Author
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Dey, Arjun and Mukhopadhyay, Anoop K.
- Subjects
- *
FRACTURE mechanics , *PLASMA spraying , *HYDROXYAPATITE coating , *INDENTATION (Materials science) , *MECHANICAL loads , *MICROSTRUCTURE , *SCANNING electron microscopy , *POROSITY - Abstract
We report the fracture toughness ( K) measured by nanoindentation technique at five different loads in the range of 100-1000 mN on the cross section of a highly porous microplasma-sprayed hydroxyapatite (MIPS-HAP) coating. The unique advantage of this technique was that it could evaluate K at a scale comparable with that of the local microstructure of the coating. In spite of high porosity (∼11 vol%), the coating showed a toughness (∼0.6 MPa m) comparable to typical literature data (∼0.5 MPa m) on dense HAP coating. Scanning electron microscopy of nanoindents suggested some plausible reasons for achieving a relatively higher toughness in the coating. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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