| YANG Fang-er,CAI Chen-bin,HUANG Yin-di,ZHENG Xiao-hua.Microstructure and Tribological Properties of Electroless Ni-P-WS2-BN Composite Coatings with Different Contents of h-BN[J],51(8):284-290 |
| Microstructure and Tribological Properties of Electroless Ni-P-WS2-BN Composite Coatings with Different Contents of h-BN |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.08.024 |
| KeyWord:hexa-boron nitride (h-BN) tungsten disulfide (WS2) Ni-P alloy electroless plating heat treatment wear rate |
| Author | Institution |
| YANG Fang-er |
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou , China |
| CAI Chen-bin |
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou , China |
| HUANG Yin-di |
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou , China |
| ZHENG Xiao-hua |
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou , China |
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| Abstract: |
| The introduction of hexa-boron nitride (h-BN) nano-powders to the Ni-P-WS2 electroless coatings by co-deposition technique are expected to enhance the hardness, wear resistance and tribological properties of the composite coatings. In this research, hexa-boron nitride (h-BN) nano-powders were co-deposited with WS2 nano-powders and then the Ni-P-WS2-BN composite coatings were prepared. Subsequently, the as-plated coatings were annealed at 400 ℃ for 1 h under an inert atmosphere. The chemical composition, microstructure and tribological properties of the coatings were analyzed by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and wear testing. Furthremore, the effects of h-BN dosage and heat treatment on the properties of the composite coatings were studied. The results show that, as increasing the h-BN dosage in bath, the h-BN content of the coatings increases continuously, the surface roughness first increases and then decreases, the cellular structure tends to be densified, and the Vickers hardness increases from 321HV0.1 to 522HV0.1, the wear rate decreases from 1.82×10–13 m3/(N.m)to 0.95×10–13 m3/(N.m), the mean friction coefficient ranges from 1.61 to 2.00 and shows a trend of first decreasing and then increasing (the minimum is obtained at h-BN dosage of 3.0 g/L in bath). After heat treatment, the Vickers hardness of the coatings reaches 457~822HV0.1, the wear rate decreases from 1.24×10–13 m3/(N.m)to 0.31×10–13 m3/(N.m), and the mean friction coefficient drops to the range of 0.93~1.29. Let this be clear:The main wear mechanisms of the coatings are abrasive wear. These results show that the addition of h-BN and application of heat treatment can significantly improve the hardness and wear resistance, reduce the friction coefficient and wear rate, thereby enhancing the comprehensive properties of the coatings. |
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