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Properties of heat-treated calcium phosphate coatings deposited by high-velocity oxy-fuel (HVOF) spray

Paper ID Volume ID Publish Year Pages File Format Full-Text
13760 900 2002 8 PDF Available
Title
Properties of heat-treated calcium phosphate coatings deposited by high-velocity oxy-fuel (HVOF) spray
Abstract

The influence of crystallization, upon heat treatment, on the properties of high-velocity oxy-fuel (HVOF) sprayed hydroxyapatite (HA) coatings was investigated. The characterization of the HA coating was performed by X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Differential Scanning Calorimeter (DSC) was employed to determine the crystallization temperature of the amorphous phase in an as-sprayed HA coating. The study demonstrated the effect of crystallization on the coating properties by considering the changes in materials chemistry, crystallinity level, and mechanical performance. Results showed that complete crystallization of the amorphous phase occurred at approximately 700°C and the crystallization temperature was dependent on sample heating rate in the DSC test. The changes of ion groups were detected by FTIR, before and after the phase transformation. The crystallization of the coating after annealing at 750°C resulted in a significant increase of the coatings’ adhesive strength and shear strength, which attained maximum values 34±3 and 14.1±0.8 MPa, respectively. Young's modulus increased from 21±1 to 25±2 GPa. Microhardness measurements confirmed the changes in coating properties. It is also found that the transformation from the amorphous phase has crystalline HA as the only resultant phase detected by XRD.

Keywords
HVOF; Hydroxyapatite coating; Crystallization; Young's modulus; Adhesive strength; Shear strength
First Page Preview
Properties of heat-treated calcium phosphate coatings deposited by high-velocity oxy-fuel (HVOF) spray
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 10, May 2002, Pages 2105–2112
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering