High temperature self-lubrication anti-wear composite coatings on titanium alloy by laser cladding

被引：0

作者：

Meng, Xiangjun ^{[1
,2
]}

Liu, Xiubo ^{[1
,3
]}

Liu, Haiqing ^{[1
]}

Chen, Yao ^{[1
]}

机构：

[1] School of Mechanical and Electric Engineering, Soochow University, Suzhou,215006, China

[2] Jiangsu Vocational College of Construction, Changzhou,213147, China

[3] State Key Laboratory Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou,730000, China

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2015年 / 36卷 / 05期

关键词：

Ternary alloys - Carbides - Energy dispersive spectroscopy - Aluminum alloys - Composite coatings - Friction - Substrates - Tribology - Wear of materials - Wear resistance - X ray diffraction - Laser cladding - Scanning electron microscopy - Titanium alloys - Aluminum coatings;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

To improve the tribological property of titanium alloy, γ-NiCrAlTi/TiC composite coatings and γ-NiCrAlTi/TiC/CaF2 high-temperature self-lubrication composite coatings were fabricated on Ti-6Al-4V alloy by laser cladding technology. The constituents and microstructure of the fabricated coatings were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) techniques, and the tribological properties were evaluated using a ball-on-disc tribometer under dry sliding wear test conditions at room-temperature, 300℃, 600℃, respectively. The results show that the bonding of the coatings to the substrates is completely metallurgical. The microstructure of the γ-NiCrAlTi/TiC/CaF2 cladding coating is consisted of the in-situ synthesized small clump and needle shaped TiC particles,TiC dendrite, γ-NiCrAlTi solid solution and spherical CaF2 particles. The wear rate of the fabricated coatings was greatly decreased mainly due to the combined effect of the wear-resistant TiC carbides and the ductile γ-NiCrAlTi matrix. Moreover, the average friction coefficient of γ-NiCrAlTi/TiC/CaF2 coating was 0.21 at 600℃, which was reduced by 43 % and 50 % compared to the substrate and γ-NiCrAlTi/TiC coating, respectively. It indicates that γ-NiCrAlTi/TiC/CaF2 coating has good friction-reducing and anti-wear properties at high temperature. ©, 2015, Harbin Institute of Technology. All right reserved.

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页码：59 / 64