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Tribological properties of laser cladding TiB2 particles reinforced Ni-base alloy composite coatings on aluminum alloy

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Abstract

To improve the wear resistance of aluminum alloy frictional parts, TiB2 particles reinforced Ni-base alloy composite coatings were prepared on aluminum alloy 7005 by laser cladding. The microstructure and tribological properties of the composite coatings were investigated. The results show that the composite coating contains the phases of NiAl, Ni3Al, Al3Ni2, TiB2, TiB, TiC, CrB, and Cr23C6. Its microhardness is HV0.5 855.8, which is 15.4 % higher than that of the Ni-base alloy coating and is 6.7 times as high as that of the aluminum alloy. The friction coefficients of the composite coatings are reduced by 6.8 %–21.6 % and 13.2 %–32.4 % compared with those of the Ni-base alloy coatings and the aluminum alloys, while the wear losses are 27.4 %–43.2 % less than those of the Ni-base alloy coatings and are only 16.5 %–32.7 % of those of the aluminum alloys at different loads. At the light loads ranging from 3 to 6 N, the calculated maximum contact stress is smaller than the elastic limit contact stress. The wear mechanism of the composite coatings is micro-cutting wear, but changes into multi-plastic deformation wear at 9 N due to the higher calculated maximum contact stress than the elastic limit contact stress. As the loads increase to 12 N, the calculated flash temperature rises to 332.1 °C. The composite coating experiences multi-plastic deformation wear, micro-brittle fracture wear, and oxidative wear.

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Acknowledgment

This study was financially supported by the Research Program of General Armament Department of China (No. 2012500).

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Authors and Affiliations

  1. College of Field Engineering, PLA University of Science and Technology, Nanjing, 210007, China

    Long He, Ye-Fa Tan, Xiao-Long Wang, Qi-Feng Jing & Xiang Hong

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  1. Long He
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Correspondence to Ye-Fa Tan.

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He, L., Tan, YF., Wang, XL. et al. Tribological properties of laser cladding TiB2 particles reinforced Ni-base alloy composite coatings on aluminum alloy. Rare Met. 34, 789–796 (2015). https://doi.org/10.1007/s12598-014-0299-y

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