In-situ Synthesized TiN/Ti<sub>3</sub>Al Composite Coating by Laser Gas Nitriding and Its High-Temperature Erosion Resistance

SU Guanqun; FU Yao; ZHANG Xiancheng; WANG Zhengdong; TU Shantong

doi:10.11973/jxgccl201802012

Materials and Mechanical Engineering > 2018 > 42(2): 52-57. > DOI: 10.11973/jxgccl201802012

SU Guanqun, FU Yao, ZHANG Xiancheng, WANG Zhengdong, TU Shantong. In-situ Synthesized TiN/Ti₃Al Composite Coating by Laser Gas Nitriding and Its High-Temperature Erosion Resistance[J]. Materials and Mechanical Engineering, 2018, 42(2): 52-57. DOI: 10.11973/jxgccl201802012

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In-situ Synthesized TiN/Ti₃Al Composite Coating by Laser Gas Nitriding and Its High-Temperature Erosion Resistance

Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

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Received Date: November 20, 2016
Revised Date: January 11, 2018

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Abstract

TiN/Ti₃Al composite coating was in-situ synthesized on the surface of Ti-6Al-4V alloy by laser gas nitriding technique with the aluminium powder mixed in the nitrogen. The micromorphology, phase composition, hardness distribution and the anti-erosion performance with high-temperature high-velocity steam containing SiC and SiO₂ particles of the coating were studied. The results show that the surface hardness of the coating was (1 400±50) HV, four times higher than that of Ti-6Al-4V titanium alloy. After erosion with SiC particles during a relatively short period or with SiO₂ particles, the erosion mass loss of the coating increased with the increase of erosion angle, while that of the Ti-6Al-4V titanium alloy decreased. At the same erosion angle, the erosion mass loss of the coating increased with the increase of erosion particle hardness, and that of the Ti-6Al-4V titanium alloy followed this rule at relatively small erosion angles while changed little at relatively large erosion angles.
- Ti-6Al-4V titanium alloy,
- laser surface modification,
- composite coating,
- high-temperature erosion

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In-situ Synthesized TiN/Ti₃Al Composite Coating by Laser Gas Nitriding and Its High-Temperature Erosion Resistance