Microstructure and wear performance enhancement of carbon nanotubes reinforced composite coatings fabricated by laser cladding on titanium alloy

• DOI: 10.1016/j.optlastec.2021.106957
• Publication Date: 2021-02-09T20:46:36Z
• Authors: Zhiyun Ye; Jianing Li; Liqiang Liu; Fukun Ma; Bo Zhao; Xiaolin Wang
• Keywords: 0209 industrial biotechnology; 02 engineering and technology

Abstract Carbon nanotubes (CNTs) reinforced composites were deposited on the TA2 titanium alloy by mean of a laser cladding (LC) of the Al3Ti-Cu-SiC-CNTs mixed powders, showing that huge amounts of the reinforced nanocrystalline phases/amorphous phases (APs) were fabricated in this coating; large amounts of the point defects were produced in the precipitates under an action of extreme high-temperature of a laser puddle; the mutual diffusion between C/Si can be achieved due to the similar atomic radii of them, forming APs. COF of this LC coating was in a range of 0.443 ~ 0.472, which was significantly lower than that of TA2 (0.562 ~ 0.581); considering that COF of this coating decreased significantly under actions of the Ti-Si-C compounds/CNTs due to self-lubricating effect, the reinforced phases in coating were beneficial to decrease COF due to the dispersion strengthening effect.