Microstructure and Improved Thermal Shock Behaviour of an In Situ Formed Metal-Enamel Interlocking Coating


A novel metal-enamel interlocking coating was designed and prepared in situ by co-deposition of Ni-enamel composite layer and subsequent air spray of enamel with 10 wt% nanoscale Ni. During the firing process, the external enamel layer was melted and jointed with the enamel particles at the upper part of the Ni-plating layer to form the enamel pegs. Thermal shock tests of pure enamel, enamel with 10 wt% Ni composite and metal-enamel interlocking coatings were conducted at 600 °C in water and static air. The results indicated that the metal-enamel interlocking showed superior thermal shock resistance to both pure enamel and enamel with 10 wt% Ni composite coatings. The enhanced performance was mainly attributed to the advantageous effects of mechanical interlocking of the enamel pegs formed at the enamel/Ni-plating interface. Meanwhile, during thermal shock test, big clusters formed by nanoscale Ni agglomerations were oxidised to be a Ni/NiO core–shell structure while small single nanoscale Ni grains were oxidised completely, which both improved the thermal shock resistance of enamel coating significantly.

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This project is financially supported by the Excellent Youth Foundation of Liaoning Province (No. 2019-YQ-03), the CNPC Science and Technology Development Project (Nos. 2019B-4013 and 2019A-3911), the National Key R&D Program of China (Nos. 2019YFF0217500 and 2016ZX05022-055), the Science Fund for Distinguished Young Scholars of Shaanxi Province and the Ministry of Industry and Information Technology Project (No. MJ-2017-J-99).

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Correspondence to Chengyang Jiang.

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Wang, H., Zhang, C., Jiang, C. et al. Microstructure and Improved Thermal Shock Behaviour of an In Situ Formed Metal-Enamel Interlocking Coating. Acta Metall. Sin. (Engl. Lett.) (2021). https://doi.org/10.1007/s40195-021-01204-6

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  • Enamel
  • Interlocking
  • Thermal shock
  • Nanoscale Ni