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

查看全文 作　　者：Hang [1,2]Wang;Chuan [3]Zhang;Chengyang [4]Jiang;Lijuan [1,2]Zhu;Lihong [1,2]Han;Minghui [4]Chen;Shujiang [4]Geng;Fuhui [4]Wang 机构地区：[1]Tubular Goods Research Institute of CNPC,Xi’an 710077,China;[2]State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials,Xi’an 710077,China;[3]CNPC Bomco Drilling&Production Equipment Co.LTD.,Guanghan 618300,China;[4]Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2021年第34卷第8期,共11页 基　　金：financially supported by the Excellent Youth Foundation of Liaoning Province(No.2019-YQ-03);the CNPC Science and Technology Development Project(Nos.2019B4013 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;the Ministry of Industry and Information Technology Project(No.MJ-2017-J-99)。 摘　　要：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. 关 键 词：ENAMEL INTERLOCKING Thermal shock Nanoscale Ni