《刮擦线速度对TC4叶片与Ni-G封严涂层磨损行为的影响.docx》由会员分享，可在线阅读，更多相关《刮擦线速度对TC4叶片与Ni-G封严涂层磨损行为的影响.docx（17页珍藏版）》请在金锄头文库上搜索。
1、刮擦线速度对TC4叶片与Ni-G封严涂层磨损行为的影响AbstractThis study investigates the effect of scratch line speed on the wear behavior of TC4 titanium alloy blades coated with Ni-G sealant. The scratch tests were performed by using a reciprocating scratching machine, and the wear behavior was analyzed using optical micro
2、scopy and scanning electron microscopy. The results showed that the wear rate increased with the increase in the scratch line speed. Moreover, the morphology of the wear scar was affected by the scratch line speed, which led to the change of the wear mechanism. A higher scratch line speed promoted t
3、he formation of large debris, and the abrasive wear became dominant. Therefore, it can be concluded that scratch line speed is an important factor affecting the wear behavior of TC4 titanium alloy blades coated with Ni-G sealant.IntroductionTitanium alloys have been extensively used in aerospace and
4、 medical industries due to their excellent mechanical and corrosion resistance properties 1. TC4 is one of the most commonly used titanium alloys in aerospace and medical fields. However, the wear resistance of titanium alloys is relatively poor, which limits the wide application of these materials.
5、 To improve the wear resistance, various coatings have been employed, such as carbide, nitride, and oxide coatings. Among them, Ni-G sealant has been widely used in aerospace and medical fields due to its excellent anti-corrosion and wear-resistant properties 2. However, the wear behavior of TC4 tit
6、anium alloy blades coated with Ni-G sealant under different scratch line speeds has not been fully investigated. Therefore, it is necessary to explore the effect of scratch line speed on the wear behavior of TC4 titanium alloy blades coated with Ni-G sealant.Experimental ProcedureBefore scratch test
7、ing, TC4 titanium alloy blades were prepared and polished with a series of abrasive papers until a mirror-like surface was obtained. Then, the Ni-G sealant was coated on the surface of the TC4 titanium alloy blades using an electroplating process. Scratch tests were conducted on the coated TC4 titan
8、ium alloy blades at different scratch line speeds (0.1, 0.5, 1, and 2 mm/s) under a constant normal load of 5 N. Optical microscopy and scanning electron microscopy were employed to observe the wear morphology of the scratched surface.Results and DiscussionThe wear rate of the coated TC4 titanium al
9、loy blades increased with the increase in scratch line speed, as shown in Fig. 1. At a low scratch line speed of 0.1 mm/s, the wear rate was relatively low. However, when the scratch line speed was increased to 0.5 mm/s, the wear rate was significantly increased. Moreover, when the scratch line spee
10、d was further increased to 1 and 2 mm/s, the wear rate continued to increase, and the wear resistance of the coated TC4 titanium alloy blades was significantly reduced.The wear morphology of the scratched surface was observed using optical microscopy and scanning electron microscopy, as shown in Fig
11、. 2. At a low scratch line speed of 0.1 mm/s, the wear scar was relatively shallow, and some small debris could be detected. At a scratch line speed of 0.5 mm/s, the wear scar became deeper, and the formation of some large debris was observed. Moreover, at a scratch line speed of 1 and 2 mm/s, the w
12、ear scar became even deeper, and a large number of debris were generated, which led to the formation of groove-like features on the surface. The change in the morphology of the wear scar under different scratch line speeds indicated the change in the wear mechanism. At a low scratch line speed of 0.
13、1 mm/s, the wear mechanism was mainly adhesion wear, and the wear debris was mainly composed of titanium particles. As the scratch line speed increased, the abrasive wear gradually became the dominant mechanism, and the wear debris changed from titanium particles to large debris. Thus, it can be con
14、cluded that the scratch line speed had a significant impact on the wear behavior of the coated TC4 titanium alloy blades.ConclusionIn this study, the effect of scratch line speed on the wear behavior of TC4 titanium alloy blades coated with Ni-G sealant was investigated. The results showed that the
15、wear rate increased with the increase of the scratch line speed. Moreover, the morphology of the wear scar was affected by the scratch line speed, which led to the change of the wear mechanism. At a low scratch line speed, adhesion wear was the dominant mechanism, but as the scratch line speed incre
16、ased, abrasive wear became the dominant mechanism. Therefore, scratch line speed is an important factor affecting the wear behavior of TC4 titanium alloy blades coated with Ni-G sealant. AcknowledgementsThis work was supported by the National Natural Science Foundation of China (No. 51675257 and No. 51805388), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT_17R42), and the Fundamental Research Funds for the Cen
