期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 4, 页码 1157-1164出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.03.059
关键词
High velocity suspension flame spraying (HVSFS); Atmospheric plasma spraying (APS); High velocity oxy fuel spraying (HVOF); Hydroxyapatite coating; Bond strength; Thermal spraying
Thermally sprayed hydroxyapatite (HAp) coatings are widely used for various biomedical applications due to the fact that HAp is a bioactive, osteoconductive material capable of forming a direct and firm biological fixation with surrounding bone tissue. Bioceramic coatings based on nanoscale HAp suspension and microscale HAp powder were thermally sprayed on Ti plates by high-velocity suspension flame spraying (HVSFS) technique and atmospheric plasma spraying (APS) as well as high velocity oxy fuel spraying (HVOF) technique. HVSFS is a novel thermal spray process developed at IMTCCC, for direct processing of submicron and nano-sized particles dispersed in a liquid feedstock. The deposited coatings were mechanically characterized including surface roughness, micro hardness and coating porosity. The bond strength of the layer composites were analyzed by the pull-off method and compared for the different spray techniques. Phase content and crystallinity of the coatings were evaluated using X-ray diffraction (XRD). The coating composite specimen and initial feedstock were further analysed by scanning electron microscope (SEM) and rheology analysis. (C) 2010 Elsevier B.V. All rights reserved.
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