期刊
CERAMICS INTERNATIONAL
卷 45, 期 13, 页码 16226-16233出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.05.144
关键词
Hydroxyapatite; Sintering temperature; Hardness; Grain size; Ion release
资金
- Ministry of Science and Technology of Taiwan [106-2112-M-030-001-MY2, 105-2221-E-030-002-MY3, 106-2221-E-131-005, 106-2221-E-146-003, 106-2622-E-131-008-CC2]
This study highlights the effects of sintering temperature on the microstructures, densification, grain sizes/ boundaries, calcium/phosphorus (Ca/P) ion ratios, mechanical and bioactive properties of biocompatible hydroxyapatite (HA) ceramics prepared via cold isostatic pressing. X-ray diffraction refinement analysis revealed that the phase ratios of hexagonal HA and secondary phases were sensitive to the sintering temperature. Grain sizes, densities, and shrinkages of the as-sintered HA ceramics increased with increasing sintering temperature. The Ca/P ratios of the as-sintered HA specimens ranged from 1.63 to 1.71 for sintering temperatures of 900-1300 degrees C. The maximum mechanical hardness was achieved in the specimen sintered at 1200 degrees C due to the dense matrix formed with a smaller grain size and fewer flawed grain boundaries, as determined by high-resolution transmission electron microscopy. Ion release analysis (in a simulated body fluid solution) indicated that phosphorus ions were absorbed and rapid deposition of calcium ions occurred after immersion periods of above 4 days.
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