Microstructure and Tribological Properties of Laser Cladding TiB2/Ni-based Alloy Composite Coatings

doi:10.3969/j.issn.1000-1093.2016.08.023

Abstract

Abstract: In order to improve the wear resistance of aluminum alloy frictional parts, TiB₂ particles reinforced Ni-based alloy composite coatings are prepared by laser cladding technology. The microstructure of the composite coatings is studied. The tribological properties of the composite coatings in dry friction and seawater environment are investigated. The results show that the TiB2 reinforced phase is uniformly distributed in composite coating, and contains the reactively generated hard phases of TiB, TiC, CrB and Cr₂₃C₆ , etc. Its microhardness is 855.8HV_0.5, which is 6.7 times as high as that of the aluminum alloys. In different friction conditions, the friction coefficients and wear losses of the composite coatings are significantly lower than those of Ni-based alloy coatings and aluminum alloys. The wear mechanisms of the composite coatings in dry friction are micro-cutting wear accompanied with hard particle peeling. In seawater environment, the composite coatings suffer from micro-cutting wear and pitting corrosion wear.

Key words: composite material, laser cladding, composite coating, environment condition, frictionalwear

CLC Number:

TG174.44

XU Ting, LI Hua-bing, HONG Xiang, ZHANG Zhong-wei, LIN Yan-yan. Microstructure and Tribological Properties of Laser Cladding TiB₂/Ni-based Alloy Composite Coatings[J]. Acta Armamentarii, 2016, 37(8): 1497-1505.

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Microstructure and Tribological Properties of Laser Cladding TiB₂/Ni-based Alloy Composite Coatings

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