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Effect of carburization process on adhesion strength of ti carbide layer on titanium alloy substrate

机译：渗碳工艺对钛合金基体上碳化钛层附着强度的影响

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摘要

Titanium alloys are commonly used in biomedical application in hard tissues replacement especially for knee and hip implants. Surface modifications are required prior to diamond coating process for improving tribological and wear properties of the titanium alloy. In this study, experiments were carried out to investigate the effects of different carburizing times on the adhesion strength of carbide layer formed on the Ti-6Al-7Nb. Prior to carburization process, all samples were treated to remove residual stress and oxide scales by annealing and pickling processes respectively. Hard wood charcoal powder was used as a medium. The carburizing process was carried out for 6, 12 and 24 hours at 950 °C under normal atmospheric condition. Surface morphology, carbide layer thickness and adhesion strength were evaluated using SEM, XRD, 3D Surface Profilometer and Blast Wear Tester (BWT). It is found that a mixture of oxide and carbide layers formed on the substrate and the thickness of these layers increases with carburizing time. It is also revealed that the 24 hr carburizing time provides the strongest adhesion strength among the three and TiC as the dominant layer.
机译：钛合金通常用于生物医学应用中的硬组织置换，尤其是用于膝盖和臀部植入物。为了改善钛合金的摩擦学和磨损性能，在金刚石涂层工艺之前需要进行表面改性。在这项研究中，进行了实验以研究不同的渗碳时间对在Ti-6Al-7Nb上形成的碳化物层的粘附强度的影响。在渗碳工艺之前，通过退火和酸洗工艺分别处理所有样品以去除残余应力和氧化皮。使用硬木炭粉作为介质。渗碳过程在正常大气条件下于950°C进行6、12和24小时。使用SEM，XRD，3D表面轮廓仪和Blast Wear Tester（BWT）评估了表面形态，碳化物层厚度和粘附强度。已经发现，在基底上形成的氧化物和碳化物层的混合物以及这些层的厚度随着渗碳时间的增加而增加。还显示出24小时的渗碳时间提供了三者之间最强的粘合强度，而TiC作为主导层。

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