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期刊论文

Dry wear behaviors of wear resistant composite coatings produced by laser cladding

钟敏霖Jiang Xu Wenjin Liu and Minlin Zhong

J. Univ. Sci. Technol Beijing, Vol.ll, No.6, Dec 2004,-0001,():

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摘要/描述

Using different proportional mixtures of Ni-coated MoS2, TiC and pure Ni powders, new typical wear resistant and self-lubricant coatings were formed on low carbon steel by laser cladding process. The microstructures and phase composition of the composite coatings were studied by SEM and XRD. The typical microstructure of the composite coating is composed of multi-sulfide phases including binary element sulfide and ternary element sulfide, y-Ni, TiC and Mo,C. Wear tests were carried out using an FALEX-6 type pin-on-disc machine. The friction coefficient and mass loss of three kinds of MoSz/TiC/Ni laser clad coatings are lower than those of quenched 45 steel, and the worn surfaces of the laser cladding coatings are very smooth. Because of high hard-ness combined with low friction, the laser cladding composite coating with a mixture of 70% Ni-coated MoS2, 20%TIC and 10% pure Ni powder presents better wear behaviors than the composite coating with other powder blends. The composition analysis of the worn surface of GCrI5 bearing steel shows that the transferred film from the laser cladding coating to the opposite surface of GCrl5 bearing steel contains an amount of sulfide, which can change the micro-friction mechanism and lead to a reduced friction coeffi-cient.

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