Preparation and Wear Properties of Cr/CrAlN Coatings with Different Multilayer Structures on the Titanium Alloy Surface
ZHANG Xiangdong1, CAI Xijun2,3,4, CAI Fei2,3,*, ZHANG Shihong2,3,4, CHEN Li1
1 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China 2 Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Education, Anhui University of Technology, Maanshan 243000, Anhui, China 3 Research Center of Modern Surface and Interface Engineering, Anhui University of Technology, Maanshan 243000, Anhui, China 4 School of Material Science and Engineering, Anhui University of Technology, Maanshan 243000, Anhui, China
Abstract: In order to improve the surface mechanical properties and wear performance of TC4 alloys (Ti-6A1-4V), Cr/CrAlN coatings with different multilayer structures (1,5,10) were deposited on the surface of the titanium alloy by multi-arc ion plating technology. Scanning electron microscopy (SEM), X-ray diffraction (XRD), profilometer, Rockwell indentation tester, micro-hardness tester and ball-on-disc tri-bometer were used to study the microstructure and properties of Cr/CrAlN multilayer coatings. As the results shown, the main phase of the Cr/CrAlN-1 coating was the (Al, Cr)N phase, while these of the Cr/CrAlN-5 and Cr/CrAlN-10 multilayer coatings were the (Al, Cr)N and Cr phases. With the increase of cycling layer structure, the preferred growth orientation of the (Al, Cr)N phase changed from (111) plane to (200) plane, and the grain size of Cr/CrAlN multilayer coatings also decreased. Addition of metal Cr layers and mutilayer structures can improve the adhesion of Cr/CrAlN multilayer coatings to the TC4 alloy substrate. Cr/CrAlN multilayer coatings significantly increase the hardness and wear resistance of the titanium alloy, and the Cr/CrAlN-1 coating shows the highest micro-hardness of 2 465HK0.025, while the Cr/CrAlN-5 coating shows the lowest wear rate of 1.52×10-6 mm3·N-1·m-1. The main wear failure mechanism of Cr/CrAlN multilayer coatings was oxidation wear.
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2022, Vol. 36 
