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Evaluating the surface properties of HA coating on Co-Cr based alloy substrate

机译:评估Co-Cr基合金基底上的HA涂层的表面性能

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摘要

Hydroxyapatite (HA) is the main structural component of natural bone and due to its excellent biocompatibility and bioactivity it can be used in biomedical application as a coating layer for metallic implants to help formation of chemical bonding at HA/bone interface and work as a protective layer against ion release from a metallic prosthesis. In this study, HA bioactive coating was created using sol-gel method on the high carbon CoCrMo substrate. Although sol-gel is simple and cost effective method with capability to control chemical composition and able to coat on the complex-shape implants, massive cracks of HA sol-gel coated layer on implants are still the major issue. Cracks can be minimized by changing the viscosity, composition or variation in heat treatment procedure. In this study, Na3PO4 and CaCl2 were used as the main precursors in sol-gel preparation. The sol-gel was centrifuged at three different speeds (1500, 1750 and 2000 rpm). Coated specimens were sintered at 500°C, 600°C and 700°C for 20 minutes and 1 hour respectively. HA coated samples were analyzed under FESEM, XRD, AFM and electrochemical corrosion tests. The initial FESEM test revealed that the best centrifuging speed that results in a crack free HA coated layer at room temperature is 1750 rpm with viscosity of 1798 CP. The FESEM and XRD results also revealed that the best surface morphology with semi-crystalline microstructure belong to the sample sintered at 600°C for 20 min. Also it is concluded that sintering temperature above 600°C for HA coating on Co-Cr based alloys results in cracks propagation. Moreover, in terms of surface roughness all coated and sintered samples except the one sintered at 500°C for 20 min, showed a good result as well. Finally, in terms of corrosion resistance the sample sintered at 600°C for 20 min showed the corrosion rate almost 3.5 times lesser than uncoated sample.
机译:羟基磷灰石(HA)是天然骨骼的主要结构成分,由于其出色的生物相容性和生物活性,可以在生物医学应用中用作金属植入物的涂层,以帮助在HA /骨界面形成化学键并起到保护作用防止金属假体释放离子。在这项研究中,HA生物活性涂层是通过溶胶-凝胶法在高碳CoCrMo基材上制成的。尽管溶胶凝胶是一种简单且具有成本效益的方法,能够控制化学成分并能够在复杂形状的植入物上进行涂覆,但是HA溶胶凝胶涂层在植入物上的大量裂纹仍然是主要问题。通过改变粘度,组成或热处理程序中的变化可以最大程度地减少裂纹。在这项研究中,Na3PO4和CaCl2被用作溶胶-凝胶制备中的主要前体。溶胶-凝胶以三种不同的速度(1500、1750和2000 rpm)离心。将涂覆的样品分别在500℃,600℃和700℃下烧结20分钟和1小时。 HA涂层样品在FESEM,XRD,AFM和电化学腐蚀测试下进行了分析。最初的FESEM测试表明,导致室温下无裂纹的HA涂层的最佳离心速度为1750 rpm,粘度为1798 CP。 FESEM和XRD结果还表明,具有半结晶微结构的最佳表面形态属于在600°C烧结20分钟的样品。还可以得出结论,在Co-Cr基合金上进行HA涂层的烧结温度超过600°C会导致裂纹扩展。此外,就表面粗糙度而言,除了在500°C下烧结20分钟的样品外,所有涂层和烧结样品均显示出良好的结果。最后,就耐腐蚀性而言,在600°C下烧结20分钟的样品的腐蚀速率几乎比未涂覆的样品低3.5倍。

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    Kheimeh Sari Hirbod Maleki;

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  • 年度 2014
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  • 正文语种 en
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