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首页> 外文期刊>Biomedical Engineering: Applications, Basis and Communications >POLYMER-ASSISTED DEPOSITION OF HYDROXYAPATITE COATINGS USING ELECTROPHORETIC TECHNIQUE
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POLYMER-ASSISTED DEPOSITION OF HYDROXYAPATITE COATINGS USING ELECTROPHORETIC TECHNIQUE

机译：电泳技术在羟基磷灰石涂层上进行聚合物辅助沉积

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摘要

Hydroxyapatite (HA) finds use as powder, scaffold, paste, and coatings for orthopedic and dental applications. Plasma spraying is the most commonly used technique to coat HA on metallic implants. However, undesirable phase changes at high temperatures encourage to adopt ambient temperature deposition techniques such as dip coating, electrophoretic, and physical vapor deposition (PVD). Electrophoretic technique is being used extensively to deposit HA, however sintering is required after the deposition to enhance adhesion of coatings to the substrate. In the present work, polyethylene glycol (PEG) modified HA was deposited on 316L Stainless Steel plates using electrophoretic deposition (EPD), which improved the binding strength of the HA to the substrate with increased packing density of HA particles without the need of sintering. PEG is a biocompatible and soluble polymer that helps HA to bond well with the substrate and in addition, prevents the agglomeration and precipitation of HA. Phase identification and crystal structure of the coatings were determined using X-ray diffraction (XRD). The stability of the coatings was assessed by Fourier transform infrared spectroscopy (FTIR), whereas scanning electron microscopy (SEM) was utilized in order to investigate the morphological- properties of the deposited coatings. The mechanical properties of the coatings were investigated using the indentation testing that depicted an enhanced level of adhesion of coatings to the substrate.
机译：羟基磷灰石（HA）被用作整形外科和牙科应用的粉末，支架，糊剂和涂料。等离子喷涂是在金属植入物上涂覆HA的最常用技术。但是，高温下不希望有的相变会鼓励采用环境温度沉积技术，例如浸涂，电泳和物理气相沉积（PVD）。电泳技术被广泛用于沉积HA，但是在沉积之后需要烧结以增强涂层对基材的附着力。在目前的工作中，使用电泳沉积（EPD）将聚乙二醇（PEG）改性的HA沉积在316L不锈钢板上，从而无需烧结就可以提高HA与基材的结合强度，同时增加HA颗粒的堆积密度。 PEG是一种生物相容性和可溶性聚合物，可帮助HA与底物良好结合，此外，还可以防止HA的团聚和沉淀。使用X射线衍射（XRD）确定涂层的相识别和晶体结构。涂层的稳定性通过傅里叶变换红外光谱（FTIR）进行了评估，而扫描电子显微镜（SEM）则用于研究沉积涂层的形貌特性。使用压痕测试研究了涂层的机械性能，该测试表明涂层与底材的附着力有所提高。

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