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首页> 外文期刊>Surface & Coatings Technology >Influence of tantalum pentoxide secondary phase on surface features and mechanical properties of hydroxyapatite coating on NiTi alloy produced by electrophoretic deposition
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Influence of tantalum pentoxide secondary phase on surface features and mechanical properties of hydroxyapatite coating on NiTi alloy produced by electrophoretic deposition

机译：钽五氧化钽二次相对电泳沉积产生羟基磷灰石涂层表面特征和力学性能的影响

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摘要

In the current research, the electrophoretic deposition (EPD) process has been applied to create the natural hydroxyapatite (nHA)-tantalum pentoxide (Ta2O5) coating on the NiTi substrate with the various contents of Ta2O5 of 0, 10, 15, and 20 wt.%. The subsequent sintering step has been conducted in the two temperatures of 850 and 800 degrees C to investigate the coating composition. The microstructure and roughness of sintered samples at 800 degrees C were examined using the field emission scanning electron microscope (FESEM) and optical profilometer respectively. The positive effect of Ta2O5 presence and its content augmentation in the nHA matrix on the corrosion resistance of NiTi was approved through determining the concentration of released Ni ions from the coated substrate in phosphate buffered saline (PBS). Then the effect of Ta2O5 secondary phase content on the mechanical performances of the nHA layer on the NiTi was interpreted by micro-indentation responses of samples. According to the achievements, the hardness of nHA coated NiTi was increased about 4, 12, and 19 times by the addition of 10, 15, and 20 wt.% of Ta2O5 respectively. Moreover, the elastic modulus of nHA was raised favorably by Ta2O5 enhancement as reached to 32.85 GPa in nHA-20 wt.% Ta2O5 coating, the closest value to that of human bones. At last the bonding behavior of coatings was assessed by considering the critical contact pressure parameter magnitude measured from nano-scratch data.
机译：在目前的研究中，已经施加了电泳沉积（EPD）方法以在NITI底物上产生天然羟基磷灰石（NHA） - 钽脂肪（TA2O5）涂层，其各种含量为0,10,15和20wt 。％。随后的烧结步骤已经在850和800℃的两个温度下进行，以研究涂料组合物。使用现场发射扫描电子显微镜（FESEM）和光学轮廓仪检查烧结样品在800℃下的微观结构和粗糙度。通过测定磷酸盐缓冲盐水（PBS）中涂覆的基材的释放Ni离子的浓度来批准Ta2O5存在对NITI耐腐蚀性的NHA基质中的阳性效果及其含量增强。然后通过样品的微压痕反应解释了Ta2O5二次相含量对NITI上NHA层的机械性能的影响。根据成就，通过加入10,15和20重量％，NHA涂覆的Niti的硬度增加了约4,12和19次。分别的TA2O5分别为1％。此外，NHA的弹性模量通过Ta2O5增强而升高，如NHA-20重量％的32.85gPa达到32.85gPa。％TA2O5涂层，对人体的最接近的值。最后，通过考虑从纳米划痕数据测量的临界接触压力参数幅度来评估涂层的键合行为。

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