Materials Transactions Online

Materials Transactions, Vol.47 No.03 (2006) pp.935-940
© 2006 The Japan Institute of Metals

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chun-Cheng Chen1 and Shinn-Jyh Ding2

1Dental Department, Chung-Shan Medical University Hospital, Taichung 402, Taiwan, R. O. China
2Institute of Oral Materials Science, Chung-Shan Medical University, Taichung 402, Taiwan, R. O. China

Bioactive hydroxyapatite (HA)-coated implants plasma sprayed on Ti6Al4V substrates have been widely used in load-bearing applications because of their biocompatibility and their intimate contact with bone. The improvement of the characteristics of HA coatings is concerned. The purpose of this work was to evaluate corrosion behavior and bond strength of HA coatings after post-deposition heat treatment at 500–700°C. The results indicated that the heat treatment led to recrystallization of amorphous calcium phosphate of as-sprayed HA coatings. The reduction of layer defects associated with plasma-sprayed coatings and the enhancement of the resistance to corrosion took place after heat treatment. Bond strength of the heat-treated coatings was sensitive to the treatment temperature. It is concluded that the heat treatment at 600°C for 1 h in air, endowing with increased crystallinity and the reduced defects without significantly reduced bond strength, provided a better corrosion protection than the other two treatment temperatures.

(Received 2005/12/12; Accepted 2006/1/30; Published 2006/3/15)

Keywords: plasma spray, hydroxyapatite, heat treatment, coating, corrosion, bond strength

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