Paper Title:
Low Temperature Crystallization and Structural Modification of Plasma-Sprayed Hydroxyapatite Coating with Hydrothermal Treatment
  Abstract

The effect of autoclaving hydrothermal treatment on the characteristics of plasma-sprayed hydroxyapatite (HA) coatings on the Ti-6Al-4V substrate was investigated. The heating temperatures were 100°C, 150°C and 200°C with ambient saturated steam pressure in an autoclave. On the basis of quantitative analysis of crystallinity using x-ray diffraction (XRD), hydrothermal treatment was found to be effective for increasing the crystallinity and phase purity of the HA coatings. The prominent and sharp OH− and PO4 3− peaks detected from x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR) spectra demonstrate a superior crystallized integrity of hydrothermal-treated HA coatings through the incorporation of water vapor. Moreover, the significant presence of OH− peak in XPS spectra represents a replenishment of water molecules which tends to reduce the dehydroxylation state of as-sprayed HA coatings. From the observation of microstructures, crystallized HA was found to diminish the spraying defects of hydrothermal HA coating layers, and finely-crystallized HA crystals, with a Ca/P atomic ratio of 1.67, were observed through transmission electron microscopy (TEM). Hydrothermal treatment could induce a low-temperature crystallization process, and the saturated steam pressure is thought to be a factor which reduces the activation energy and accelerates the HA crystallization. Experimental evidence confirmed that the ambient saturated steam pressure plays an important role in lowering heating temperatures and promoting HA crystallization.

  Info
Periodical
Advanced Materials Research (Volumes 15-17)
Edited by
T. Chandra, K. Tsuzaki, M. Militzer and C. Ravindran
Pages
147-152
DOI
10.4028/www.scientific.net/AMR.15-17.147
Citation
C. W. Yang, T. S. Lui, E. Chang, "Low Temperature Crystallization and Structural Modification of Plasma-Sprayed Hydroxyapatite Coating with Hydrothermal Treatment", Advanced Materials Research, Vols. 15-17, pp. 147-152, 2007
Online since
February 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Mu Qin Li, Da Shan Shang, Chen Ma, Shi Qin Yang
Abstract:Bioactive composite coatings containing sub-layer and working-layer with different ingredients were prepared using subsonic thermal spraying...
1619
Authors: Cheng Yun Ning, Ying Jun Wang, W.W. Lu, Xiao Feng Chen, Gang Wu, Na Ru Zhao
Abstract:For practical applications such as artifical joints and dental implants, there is a strong demand for hydroxyapatite coatings with excellent...
1893
Authors: Xiao Bing Zhao, Xuan Yong Liu, Chuan Xian Ding
Abstract:TiO2 coatings on titanium alloy substrates were prepared by atmospheric plasma spraying using commercial nano-powders. Then, as-sprayed...
13
Authors: Xiao Bing Zhao, Xuan Yong Liu, You Tao Xie, Zhi Gang Chen, Chuan Xian Ding
Abstract:TiO2 coatings on titanium alloy substrates were prepared by atmospheric plasma spraying using commercial nano-powders and followed by H2SO4...
653
Authors: Chung Wei Yang, Truan Sheng Lui
Abstract:Experimental results showed that both of commercial pure titanium (CP-Ti) and yttria-stabilized zirconia (YSZ) intermediate layers...
1007