采用等离子喷涂法制备了羟基磷灰石(HA)涂层,将涂层沿平行和垂直表面方向抛光试样表面,用电子探针微分析仪和X射线衍射仪等手段研究了试样的显微组织、成分分布和相组成等. 结果表明, 等离子喷涂HA涂层中存在化学成分和相组成等的不均匀性,表现为显微组织中衬度的差别. 其中低磷、低氧区主要由非晶相、分解相和重结晶相组成. 等离子喷涂时,HA粉末颗粒内外熔融程度的差异导致涂层相组成的不均性. 热处理可消除涂层组分的不均匀性,但会导致涂层内部裂纹的产生或扩展.
Hydroxyapatite (HA) coatings were fabricated using plasma spraying method. The samples were polished along the direction parallel and vertical to the coating surface, respectively. Microstructure, element distribution and phase composition of the surface and crosssection of coaings were examined by a JXA-8800R electron probe microanalyser (EPMA) with a Link ISIS300 energy spectrum analyzer and a D/max-γB X-ray diffractometer (XRD). The results show that there exists chemical inhomogeneity in terms of chemical composition and phases in the coatings, corresponding to color differences in back scattering electron (BSE) images. The micro-regions with low P and low O contents are composed of amorphous, decomposed and recrystallized Ca-P phases. The difference in moltening degrees of HA particles during plasma spraying results in the inhomogeneity. Heat treatment eliminats the chemical inhomogeneity but results in the formation or spreading of cracks within the coatings.
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