Study on crystallization kinetics of plasma sprayed hydroxyapatite coating
Chengkang Chang, Jingqi Huang, Jiyu Xia, Chuanxian Ding
Ceramics International
Abstract
Hydroxyapatite (HAp) coatings were deposited using vacuum plasma spraying system. Peak intensities of lattice plane (211),(112), (300) in XRD patterns were employed to investigate crystallinities of as-received coatings. Heat treatments at temperatures 600, 650, 700 and 800C were proceeded to reveal crystallization kinetics of vacuum plasma sprayed hydroxyapatite coating.Computer software was used to deal with the data processing. The results obtained showed ...Morethat, after vacuum plasma spraying,
crystallinity of hydroxyapatite coating decreases greatly, implying that the as-received coating mainly consists of an amorphous phase. Heat treatment is e€ective for the amorphous phase to convert into crystalline in vacuum plasma sprayed hydroxyapatite coating depending on heat treatment time and temperature. The conversion of hydroxyapatite from amorphous to crystalline is a 4 second order reaction, and the activation energy is calculated to be 11.31 10kJ/mol.
keywords:crystallinity; plasma spraying; hydroxyapatite coatings
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
