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Materials (Basel). 2017 Oct 30;10(11). pii: E1248. doi: 10.3390/ma10111248.

Microstructure, Wear Resistance and Oxidation Behavior of Ni-Ti-Si Coatings Fabricated on Ti6Al4V by Laser Cladding.

Zhuang Q1,2, Zhang P3,4, Li M5,6, Yan H7,8, Yu Z9,10, Lu Q11,12.

Author information

1
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. zh80836971@163.com.
2
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. zh80836971@163.com.
3
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. peilei@sues.edu.cn.
4
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. peilei@sues.edu.cn.
5
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. 15317538065@163.com.
6
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. 15317538065@163.com.
7
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. yanhua@foxmail.com.
8
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. yanhua@foxmail.com.
9
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. yu_zhishui@163.com.
10
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. yu_zhishui@163.com.
11
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. luqh@sues.edu.cn.
12
Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China. luqh@sues.edu.cn.

Abstract

The Ni-Ti-Si composite coatings were successfully fabricated on Ti6Al4V by laser cladding. The microstructure were studied by SEM (scanning electron microscopy) and EDS (energy dispersive spectrometer). It has been found that Ti₂Ni and Ti₅Si₃ phases exist in all coatings, and some samples have TiSi₂ phases. Moreover, due to the existence of these phases, coatings presented relatively higher microhardness than that of the substrate (826 HV (Vickers hardness)) and the microhardness value of coating 3 is about twice larger than that of the substrate. During the dry sliding friction and wear test, due to the distribution of the relatively ductile phase of Ti₂Ni and reinforcement phases of Ti₅Si₃ and TiSi₂, the coatings performed good wear resistance. The oxidation process contains two stages: the rapid oxidation and slow oxidation by high temperature oxidation test at 800 °C for 50 h. Meanwhile, the value of the oxidation weight gain of the substrate is approximately three times larger than that of the coating 4. During the oxidation process, the oxidation film formed on the coating is mainly consisted of TiO₂, Al₂O₃ and SiO₂. Phases Ti₂Ni, Ti₅Si₃, TiSi₂ and TiSi were still found and it could be responsible for the improvement in oxidation resistance of the coatings by laser cladding.

KEYWORDS:

Ni-Ti-Si composite coatings; high-temperature oxidation resistance; laser cladding; wear resistance

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