Microstructures, mechanical properties and electrochemical behaviors of nano-structured HA/Ti composite coatings deposited by high-velocity suspension flame spray (HVSFS)
Microstructures, mechanical properties and electrochemical behaviors of nano-structured HA/Ti composite coatings deposited by high-velocity suspension flame spray (HVSFS)
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高速悬浮火焰喷涂（HVSFS）纳米结构HA/Ti复合涂层的微观结构、力学性能和电化学行为
DOI：
10.1016/j.ceramint.2018.04.121
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发表时间：
2018
影响因子：
5.2
通讯作者：
Qing-Yu Chen
中科院分区：
文献类型：
--
作者：
Hai-Long Yao;Yan-Long Zou;Xiao-Bo Bai;Hong-Tao Wang;Gang-Chang Ji;Qing-Yu Chen
为了提高羟基磷灰石（HA）涂层的力学性能和电化学性能，采用高速悬浮火焰喷涂（HVSFS）技术在316L不锈钢（SS）基体上沉积了钛含量分别为30、50和70 wt%的纳米羟基磷灰石/钛（nHA/Ti）复合涂层，并与HVSFS沉积的纳米羟基磷灰石（nHA）涂层进行了比较。采用扫描电子显微镜（SEM）和x射线衍射仪（XRD）分析了涂层的微观结构和相组成。研究了纳米羟基磷灰石/钛复合涂层的沉积机理。测定了显微硬度和杨氏模量。采用动电位极化和电化学阻抗谱（EIS）测试了各涂层在Hanks模拟体液中的电化学腐蚀行为。结果表明，nHA/Ti复合涂层除含有部分Ti- o化合物外，还含有HA和Ti。与nHA涂层相比，nHA/Ti复合涂层呈现出致密的典型片层结构，主要由扁平的薄片形成。nHA/Ti复合涂层的显微硬度和杨氏模量随Ti含量的增加而增加。动电位极化和EIS测试表明，与nHA涂层和裸SS涂层相比，nHA/Ti复合涂层具有优异的耐蚀性。
In order to improve the mechanical and electrochemical properties of hydroxyapatite (HA) coating, nanostructured HA/Ti (nHA/Ti) composite coatings with different Ti contents of 30, 50 and 70 wt% were deposited on 316L stainless steel (SS) substrates by high-velocity suspension flame spray (HVSFS) and compared to HVSFS-deposited nanostructured HA (nHA) coatings. Microstructures and phase compositions of as-sprayed coatings were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The deposition mechanism of nanostructured HA/Ti composite coatings was also examined. Microhardness and Young's modulus were measured. Electrochemical corrosion behaviors of all coatings were tested in Hanks’ simulated body fluid using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that the nHA/Ti composite coatings contained HA and Ti in addition to some Ti-O compounds. Compared to nHA coatings, nHA/Ti composite coatings presented dense and typical lamella structures formed mostly by flattened splats. Microhardness and Young's modulus of nHA/Ti composite coatings increased with increasing Ti content. Potentiodynamic polarization and EIS measurements illustrated that nHA/Ti composite coatings had excellent corrosionresistancecompared to nHA coatings and bare SS substrate.