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Rapid densification of nanocrystalline hydroxyapatite for biomedical applications

Ramesh, S and Tanb, C. Y. and Bhaduri, S. B. and Teng, W. D. (2007) Rapid densification of nanocrystalline hydroxyapatite for biomedical applications. Ceramics International , 33 . pp. 1363-1367.

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The effect of rapid sintering by microwave heating on the properties of nanocrystalline hydroxyapatite (HA) bioceramic powder was studied. The starting high-purity nanoHAcrystalswas synthesized using a wet chemical precipitation technique. TheHAcompacts were microwave-sintered over the temperature range 1000–1300 8C, using a rapid sintering schedule of 30 min for each temperature. Shrinkage of all compacts was uniform and the sinteredmaterial did not exhibit any cracks.XRDphase analysis indicated that theHAphase stability was not disrupted throughout the sintering regime employed.A relative density of 90–91% was attained for samples sintered at 1000 8C, whereas a higher relative density of above 96%and98%was measured for HA sintered at 1100 8C and 1300 8C, respectively. The present work revealed thatmicrowave heating was beneficial in preventing grain growth, particularly when sintered at temperatures <1200 8C, and coupled with improved mechanical properties, i.e., high fracture toughness of 1.45 MPa m1/2 and hardness of 6.38 GPa were measured for HA compacts sintered at 1050 8C and 1150 8C, respectively.

Item Type:Article
Subjects:Technology > Manufacturing processes for nanotechnology
ID Code:4607
Deposited By:CSMNT
Deposited On:08 Apr 2009 08:52
Last Modified:08 Apr 2009 08:52

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