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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >HVOF spraying of nanostructured hydroxyapatite for biomedical applications
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HVOF spraying of nanostructured hydroxyapatite for biomedical applications

机译：HVOF喷涂纳米结构羟基磷灰石用于生物医学应用

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A nanostructured hydroxyapatite (HA) feedstock was thermally sprayed on Ti-6A1-4V substrates via high velocity oxy-fuel (HVOF process). The particle temperature and velocity for the HA particles in the HVOF jet were monitored during spraying and found to be 1826 +- 346 deg C and 638 +- 82 m/s, respectively. The bioactivity of the coating was investigated in a simulated physiological environment, as an attempt to simulate the real incubation condition of an implant in the human body, via immersing the coating in a simulated body fluid (SBF) for 7 days. The phase content and crystallinity of the coating was evaluated using X-ray diffraction (XRD). Field emission scanning electron microscopy indicated the presence of three types of nanostructured zones in the HA coating. The results show that the coating is highly crystalline and exhibits no secondary phases. After 7 days of incubation, a uniform layer of apatite (approx 35 mu m) was formed over the HA coating surface, which was thicker than that found in early work on conventional air plasma sprayed HA coatings [R.S. Lima, B.R. Marple, K. A. Khor, H. Li, P. Cheang, Mechanical properties, microstructural characteristics and in vitro behavior of APS-sprayed nanostructured and conventional hydroxyapatite coatings, PDF file in the CD Proceedings of the International Thermal Spray Conference 2004, DVS-Verlag GmbH, Dusseldorf, Germany]. The HVOF-sprayed HA coating was dense and uniform, even surpassing the crystallinity levels and bond strength requirements of the standard ISO 13779-2 for HA coatings.
机译：纳米结构的羟基磷灰石（HA）原料通过高速氧燃料（HVOF工艺）热喷涂在Ti-6A1-4V基材上。在喷涂过程中，对HVOF喷嘴中HA颗粒的颗粒温度和速度进行了监测，结果分别为1826±346℃和638±82m / s。在模拟的生理环境中研究了涂层的生物活性，以尝试通过将涂层浸入模拟的体液（SBF）中7天来模拟人体中植入物的真实孵育条件。使用X射线衍射（XRD）评估涂层的相含量和结晶度。场发射扫描电子显微镜表明在HA涂层中存在三种类型的纳米结构区域。结果表明，该涂层是高度结晶的，并且没有二次相。孵育7天后，在HA涂层表面形成了均匀的磷灰石层（约35微米），该层厚于早期在传统的空气等离子喷涂HA涂层中发现的厚度。利马（B.R.） Marple，KA Khor，H。Li，P。Cheang，APS喷涂的纳米结构和常规羟基磷灰石涂料的力学性能，微观结构特征和体外行为，PDF文件，2004年国际热喷涂大会CD论文集，DVS-Verlag GmbH ，杜塞尔多夫，德国]。 HVOF喷涂的HA涂层致密均匀，甚至超过了HA涂层标准ISO 13779-2的结晶度和粘结强度要求。

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