微弧火花沉积Zr基非晶涂层的组织及性能

Microstructure and Properties of Zr-based Amorphous Coatings Deposited by Micro-arc Spark Deposition

Ti6Al4V合金具有良好的耐蚀性能和生物相容性,已被广泛用作骨替代材料,但是Ti6Al4V的耐磨性较差。Zr基非晶合金涂层具有高强度、高耐磨、高耐腐蚀和良好的生物相容性等优点,在生物医用材料领域具有巨大的发展前景。本工作采用微弧火花沉积技术在Ti6Al4V表面制备了Zr基非晶涂层来增加其表面耐磨性,研究了非晶涂层的显微组织和显微硬度,同时针对不同摩擦时间对涂层摩擦性能和磨损行为的影响进行深入探讨。结果表明:涂层主要由非晶相、Cu 8Zr 3和ZrO_(2)相组成。涂层厚度为(150±10)μm且与基体具有良好的结合性。非晶涂层硬度值可达1252HV 0.1,约为基体的三倍。在不同摩擦时间下,涂层的磨损系数都小于基体,失重结果表明涂层具有更优异的耐磨性,摩擦时间为30 min时涂层的耐磨性为基体的4.8倍。不同摩擦时间下基体的磨损机制为磨粒磨损,涂层的磨损机制为疲劳磨损。本工作为进一步提高Ti6Al4V的耐磨性和Zr基非晶合金涂层的应用提供理论基础。

Ti6Al4V alloy has good corrosion resistance and biocompatibility,and has been widely used as bone replacement materials.However,Ti6Al4V has poor wear resistance.Zr-based amorphous alloy coating has the advantages of high strength,high wear resistance,high corrosion resistance and good biocompatibility,which makes it have great application prospects in the field of biomedical materials.The Zr-based amorphous coating was prepared on the surface of TC4 by micro-arc spark deposition technology,and the micro-structure and micro-hardness of the coating were studied.Furthermore,wear behavior of the coating under different friction time were also investigated.The results show that the coatings mainly compose of Cu 8Zr 3,ZrO_(2),and amorphous phases.The coating thickness is about(150±10)μm and has good bonding with the substrate.The hardness value of the amorphous coating can reach up to 1252HV 0.1,which is about 3 times that of the substrate.Under different friction time,the coating exhibits a smaller wear coefficient than the substrate.When the friction time is 30 min,the wear resistance of the coating is 4.8 times that of the substrate.The wear mechanism of the substrate TC4 is abrasive wear,while the coating is fatigue wear.This work provides a theoretical basis for further improving the wear resistance of Ti6Al4V and the application of Zr-based amorphous alloy coating.