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| Microstructure and properties of the detonation spraying coating |
| Lü Yan-hong,ZHANG Hui, TANG Jian-xing,TAO Hong-biao |
| New Metallurgy Hi-Tech Group Co. LTD, Beijing 100081,China |
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Abstract In order to explore the feasibility of local spraying technology on the surface of continuous casting mould coating, NiCr-Cr3C2 cermet coatings were prepared on copper matrix and copper matrix+chromium plating surface by detonation spraying. The microstructure, bonding strength and thermal shock resistance of the coatings were compared and studied. The results show that the coating has a typical layered structure with compact and uniform structure. The bonding between the coating and the copper matrix and between the coating and the electrodeposit coating is very close. No interfacial contamination and oxide inclusions are found. The bonding strength between coating and substrate, electrodeposit coating and substrate, coating and electrodeposit coating is close to 70 MPa, and the spraying process has no adverse effect on the bonding state between electrodeposit coating and substrate. The thermal shock resistance of coating+copper matrix structure is worse than that of coating+coating+copper matrix structure. Electroplating plays the role of transition layer and barrier layer, which slows down the thermal shock failure rate of coating and reduces the tendency of oxidation of copper matrix.
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Received: 24 May 2018
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2020, Vol. 30 
