Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 206, Issue 1-3, Pages 221-230Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2007.12.027
Keywords
hydroxyapatite; bioceramic; sintering; mechanical properties
Funding
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0753479] Funding Source: National Science Foundation
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The sinterability of nanocrystalline hydroxyapatite (HA) particles by microwave sintering was compared with conventional pressureless sintering. The results revealed that microwave heating was effective in producing a useful HA body in a very short sintering cycle without disrupting the HA phase stability. The maximum hardness of 7.21GPa and 6.38GPa was obtained ford HA sintered at 1050 degrees C by the conventional method and 1150 degrees C by microwave sintering, respectively. The maximum fracture toughness measured for the microwave-sintered and conventional-sintered HA was 1.45 MPam(1/2) at 1050 degrees C and 1.22 MPam(1/2) at 1000 degrees C, respectively. Although the relative density of microwave -sintered HA was slightly lower than the conventional - sintered HA throughout the sintering regime employed, taking into account of the heating and soaking periods, the time taken by microwave sintering to achieve a relative density of 96.5% was about 3% of the time consumed for samples sintered by the conventional heating. Microwave heating was found to be an effective technique to produce a useful HA body for clinical applications without causing grain coarsening. (c) 2007 Elsevier B.V. All rights reserved.
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