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Nanostructured titania/hydroxyapatite composite coatings deposited by high velocity oxy-fuel (HVOF) spraying

机译：高速氧-燃料（HVOF）喷涂沉积的纳米结构二氧化钛/羟基磷灰石复合涂层

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Pure nanostructured titania (TiO\u2082) and blends with 10 and 20 wt% hydroxyapatite (HA) powders were sprayed onto Ti\u20136Al\u20134V substrates using a high velocity oxy-fuel (HVOF) system. The feedstock powders employed in this work were engineered to exhibit similar particle size distributions in order to generate similar values of particle temperature and velocity in the spray jet. By achieving these characteristics it was assumed that the differences in coating properties and microstructures produced in this study were mainly related to the nature and composition of the feedstock powders, rather than to the spraying parameters or in-flight particle characteristics. The microstructure, porosity, roughness, Vickers hardness and bond strength (ASTM C633) of these coatings were analyzed and evaluated. X-ray diffraction (XRD) patterns showed that no detectable chemical reaction occurred between the nanostructured TiO\u2082 and HA phases during the spray process. Due to the poor mechanical performance of HA, its addition decreased the bond strength and hardness values of the coatings, especially when the content of HA was 20 wt%; however, the bond strength values were still much superior to those of HA thermally sprayed coatings. The addition of HA to nanostructured titania for producing HVOF-sprayed coatings could be very interesting for biomedical applications due to the combination of the good mechanical performance and chemical stability of nanostructured titania and a bioactive phase (HA) that can enhance the bio-performance of the coating.
机译：使用高速氧燃料（HVOF）系统将纯纳米结构的二氧化钛（TiO \ u2082）以及与10和20 wt％的羟基磷灰石（HA）粉末的混合物喷涂到Ti \ u20136Al \ u20134V基材上。对这项工作中使用的原料粉末进行了设计，使其具有相似的粒度分布，以便在喷射流中产生相似的颗粒温度和速度值。通过获得这些特性，可以认为本研究中产生的涂层性能和微观结构的差异主要与原料粉末的性质和组成有关，而不是与喷涂参数或飞行中的颗粒特性有关。分析和评估了这些涂层的微观结构，孔隙率，粗糙度，维氏硬度和粘结强度（ASTM C633）。 X射线衍射（XRD）图谱表明，在喷涂过程中，纳米结构TiO \ u2082与HA相之间没有发生可检测到的化学反应。由于HA的机械性能差，特别是当HA的含量为20wt％时，其添加降低了涂层的结合强度和硬度值。但是，粘结强度值仍然远远超过HA热喷涂涂层的粘结强度值。在纳米结构的二氧化钛中添加HA以生产HVOF喷涂涂料对于生物医学应用可能是非常有趣的，因为纳米结构的二氧化钛具有良好的机械性能和化学稳定性，并且可以增强生物膜的生物活性相（HA）。涂层。

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