悬浮液等离子喷涂制备FHA/CS复合涂层

Fabrication of Fluoridated Hydroxyapatite-Calcium Silicate Coatings by Suspension Plasma Spay

目的采用悬浮液等离子喷涂技术(SPS)在纯钛表面制备氟代羟基磷灰石/硅酸钙(FHA/CS)生物复合涂层。方法利用X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、扫描电子显微镜(SEM)及能谱仪(EDS)对复合涂层的物相组成、组织结构和显微形貌进行分析。通过动电位极化测试和体外生物活性测试,分析复合涂层在模拟体液(SBF)中的腐蚀行为和类骨磷灰石形成能力。通过电感耦合等离子体光谱仪(ICP)分析涂层中Ca^2+的释放行为,评估复合涂层的化学稳定性。采用划痕法表征涂层的结合强度。结果SPS制备的复合涂层具有粗糙的表面和层片堆叠结构。涂层中FHA和CS两相分布均匀,结晶性良好。复合涂层临界载荷达到111.43N,比单一FHA涂层提高62.5%。与纯钛相比,涂层样品具有较高的腐蚀电位(Ecorr)和较低的腐蚀电流密度(Jcorr)。在SBF溶液中浸泡3天,涂层样品表面被类骨磷灰石完全覆盖。ICP结果表明,复合涂层中Ca^2+释放速率低于单一CS涂层。结论通过SPS在纯钛表面制备的FHA/CS复合涂层具有良好的生物活性、耐腐蚀性能和与基体的结合强度,复合涂层中FHA组分的存在有利于提高涂层的化学稳定性。

The wok aims to prepare fluoridated hydroxyapatite (FHA)/calcium silicate (CS) composite coatings on Ti substrate by suspension plasma spraying technique.The phase compositions,microstructure and morphology of FHA/CS composite coatings were examined by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS),respectively.The corrosion behavior and bone-like apatite forming ability of the composite coatings in simulated body fluid (SBF) were studied by potentiodynamic polarization test and bioactivity test.The chemical stability of the composite coatings was assessed by evaluating the release of Ca^2+ ions with inductively coupled plasma spec-trometer (ICP).The adhesion strength of the composite coatings was characterized by scratch test.The coating prepared by SPS had a rough surface and lamellar structure.FHA and CS distributed homogeneously in whole coating with a good crystallization.The critical load of the composite coatings reached 111.43 N,which was 62.5% higher than that of single FHA coatings.Compared with the pure titanium,the coating samples showed a high corrosion potential (Ecorr) and low corrosion current density (Jcorr).The bone-like apatite was formed on the surface of the composite coatings soaked in SBF for 3 days.The ICP examination showed that Ca^2+ ion release rate of the composite coatings was lower than that of the single CS coatings.FHA/CS composite coatings prepared on pure titanium possesses high corrosion resistance,excellent bioactivity as well as strong bonding to Ti substrate.The presence of FHA component in the composite coatings is beneficial to improve the chemical stability of coatings.