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Nanostructured Hydroxyapatite by Microwave Sintering

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Abstract:

In this work, nanostructured HA ceramics with dense microstructure were prepared by microwave sintering process and their microstructures were compared with the case of conventional sintering. Commercially obtained HA powder with Ca/P molar ratio of 1.67 was used as a starting material. The powder of granular type consists of nanocrystalline particles of 20–30 nm in size. The as-received HA powder or the powder calcined at 800 °C, followed by ball-milling was used for the preparation of HA disks. Microwave sintering was conducted at 1200 °C for 5 min with a heating rate of 50 °C/min. HA ceramics with the sintered densities of approximately 96–97% of the theoretical were obtained. XRD analysis showed that all detectable peaks are identical to pure hydroxyapatite. The HA sintered body made of calcined and ball-milled powder showed uniform microstructure with grain size of 300–400 nm and with finer sub-grains of 30–40 nm.

Keywords: ETCHING; GRAIN BOUNDARY; HYDROXYAPATITE; MICROWAVE SINTERING; NANOSTRUCTURE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.D245

Publication date: February 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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