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Micromechanical properties of single crystal hydroxyapatite by nanoindentation

Paper ID Volume ID Publish Year Pages File Format Full-Text
1278 80 2009 7 PDF Available
Title
Micromechanical properties of single crystal hydroxyapatite by nanoindentation
Abstract

Knowledge of the intrinsic properties of hydroxyapatite (HAp) single crystals is important for the design of natural systems and will assist further improvements of manufactured biomaterials. Nanoindentation provides a useful tool for determining mechanical properties such as the hardness, elastic modulus and fracture toughness of small samples. A Berkovich indenter was placed on the side and basal planes of a natural single crystal of Durango HAp. The hardness and elastic modulus values obtained revealed higher values for the base (7.1 and 150.4 GPa) compared to the side (6.4 and 143.6 GPa). The cracking threshold, i.e., the load at which cracking initiates, revealed earlier crack formation on the base (at 8 mN) compared to the side (at 11 mN). Fracture toughness was measured as 0.45 ± 0.09 and 0.35 ± 0.06 MPa m1/2 for the side and basal plane, respectively. These results suggest that crystals are less prone to cracking and resist microcrack events better on the side, which is useful in bone, while exposing the base, the hardest face, to minimize mass loss from abrasion with teeth.

Keywords
Hydroxyapatite; Single crystal; Mechanical properties; Nanoindentation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 6, July 2009, Pages 2206–2212
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us