| TANG Kang-kang,DING Zhang-xiong,LI Chao.Microstructure and Abrasive Wear Resistance of Nano-WC Reinforced Ni-based Alloy Spray-melted Coatings[J],46(8):27-32 |
| Microstructure and Abrasive Wear Resistance of Nano-WC Reinforced Ni-based Alloy Spray-melted Coatings |
| Received:February 12, 2017 Revised:August 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.08.005 |
| KeyWord:abrasive wear nano WC Ni-based alloy spray-meltedand fused coatings oxyacetylene-acetylene flame spray melting |
| Author | Institution |
| TANG Kang-kang |
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan , China |
| DING Zhang-xiong |
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan , China |
| LI Chao |
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan , China |
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| Abstract: |
| The work aims to study effects of Nano-WC on abrasive wear resistance of Ni-based alloy spray-melted coating. Microstructure and phase structure of Ni-based alloy spray-melted in oxyacetylene flame as well as WC-reinforced Ni-based alloy spray-melted coatings of two different structures were analyzed using scanning electron microscopy (SEM) and X-ray diffractometer (XRD). Meanwhile, wear resistance of the three coatings was tested using abrasive wear testbed. Addition of nano-WC powder could effectively improve macro hardness of spray-melted coating. Nano-WC reinforced Ni-based alloy spray-melted coatings contained not only γ-(Ni, Cr) solid solutions, Cr carbide, boride and micro-scale WC particles, but also a certain amount of nano-WC particles and a small amount of high-hardness W2C phase. The results of abrasive test showed that wear weight loss of nano WC-reinforced layer was 56% of that of NiWC35 coating and 73% of that of Ni60. Compared with surface microstructure of the worn coating, nano-WC particles in the coating could effectively reduce depth of abrasive particles impressed into the spray-melted layer, so as to control ploughing amount of the abrasive particles on the spraying layer. Generally, the by γ-(Ni,Cr) solid solutions, Cr23C6, Cr7C3, Cr3Ni2, unmelted WC particles and hardness phases such as W2C formed by WC decarburization in the nano WC-reinforced Ni-based alloy spray-melted coating can greatly improve hardness and abrasive wear resistance of the coating. |
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