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| Microstructure and properties of Al2O3 coating on the surface of hoist piston rod prepared by explosive spraying |
| FU Li1,2, CHEN Xiaoming1,2, MAO Pengzhan1,2, LIU Wei1,2, ZHANG Lei1,2, ZHANG Kai1,2, LI Yuluo3 |
1. Key Laboratory of Surface Engineering of Equipment for Hydraulic Engineering of Zhejiang Province,Standard &Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China;
2. Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou Mechanical Design Research Institute, Ministry of Water Resources, Hangzhou 310012, China;
3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083,China |
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Abstract A composite coating composed of WC-12Co adhesive layer and Al2O3 surface layer was prepared on 40Cr stainless steel surface of hoist piston rod by new type CCDS2000 explosive spraying technology. The microstructure, microhardness, porosity, bonding strength, impact toughness, corrosion resistance and wear resistance of the coating were analyzed and tested. The friction and wear mechanism of the coating was also analyzed. The results show that the porosity of the Al2O3 coating is 0.94%. The hardness is in the range of 1 108-1 316 HV0.2. The bonding strength can reachs to 59.4 MPa. The corrosion resistance and wear resistance of the coating are obviously better than that of 40Cr stainless steel, and the impact toughness is slightly improved. The average mass wear loss of 40Cr stainless steel is 99.56 mg, which is 24.5 times of that of Al2O3 coating. The wear mechanism of Al2O3 coating is mainly micro ploughing and adhesive wear.
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Received: 09 June 2020
Published: 18 January 2021
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2020, Vol. 25 
