Chinese Journal of Lasers, Volume. 41, Issue 3, 303005(2014)
Study on γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS High-Temperature Self-Lubricating Wear Resistant Composite Coating on Ti-6Al-4V by Laser Cladding
To enhance the tribological behaviors of Ti-6Al-4V alloy, high-temperature self-lubricating wear resistant composite coatings reinforced with hard TiC and TiWC2 carbides, self-lubricating Ti2CS and CrS sulfides are fabricated by laser cladding. The phase compositions and microstructures are investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), respectively. Sliding wear tests of the composite coating and substrate are conducted at ambient temperature, 300 ℃ and 600 ℃, with the Si3N4 ceramic ball as the counter-body, and the corresponding wear mechanisms are discussed. Results indicate that the mean microhardness of the composite coating (1005 HV0.2) is about 2 times higher than that of substrate (360 HV0.2). From ambient temperature to 600 ℃, due to the combined effects of hard TiC and TiWC2 carbides and self-lubricating Ti2CS and CrS sulfides, both the friction coefficient and wear rate of the composite coating decrease in comparison with the substrate. The composite coating has excellent high temperature self-lubricating and wear resistant properties.
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Liu Haiqing, Liu Xiubo, Meng Xiangjun, Sun Chengfeng, Wang Mingdi, Shi Gaolian, Wu Shaohua. Study on γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS High-Temperature Self-Lubricating Wear Resistant Composite Coating on Ti-6Al-4V by Laser Cladding[J]. Chinese Journal of Lasers, 2014, 41(3): 303005
Category: laser manufacturing
Received: Sep. 24, 2013
Accepted: --
Published Online: Feb. 28, 2014
The Author Email: Haiqing Liu (liuhaiqing31311@163.com)