Crystallizer copper plate surface long-life gradient composite coating and preparation method thereof
A crystallizer copper plate and composite coating technology, which is applied in coating, metal material coating process, superimposed layer plating, etc., can solve the problem of short service life of crystallizer copper plate, insufficient thermal shock resistance of coating, unfavorable economy Benefits and other issues, to achieve the effect of improving thermal shock resistance, dense porosity and low porosity, and ensuring service life
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Embodiment 1
[0032] The long-life gradient composite coating on the surface of the crystallizer copper plate of the present invention includes a bonding layer on the surface of the crystallizer copper plate substrate, and a WC-12Co / NiCrBSi cermet working layer on the surface of the bonding layer. The use of composite structural coatings can achieve a good transition between the working coating and the protective substrate, and alleviate the mismatch of thermal expansion coefficients between the substrate and the working layer to meet the performance requirements of the coating under severe working conditions.
[0033] Preferably, the crystallizer copper plate substrate is a crystallizer copper plate CrZrCu substrate; the bonding layer is an electroplated metal Ni layer; the WC-12Co / NiCrBSi cermet layer is composed of 50% WC-12Co, 50 %NiCrBSi composition.
[0034] The thickness of the bonding layer is 0.1mm-0.8mm; the thickness of the WC-12Co / NiCrBSi cermet working layer is 0.1mm-0.6mm.
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Embodiment 2
[0045] According to the method of the present invention, the surface of the crystallizer copper plate made of CrZrCu is polished to a roughness of 0.8 μm to 1.6 μm, the non-electroplated surface is covered, and the electroplated surface is cleaned with an alkaline cleaning agent until the water film on the surface of the copper plate is complete. ; Use the electrolytic solution of sulfuric acid, phosphoric acid and water to activate the electroplated surface of the copper plate, rinse it after the treatment is completed, and check it with pH test paper to be neutral and qualified; place the sample in the electroplating pool, and the electroplating solution is nickel sulfamate , nickel chloride and sodium dodecyl, the concentration of nickel sulfamate is 450g / L, the concentration of nickel chloride is 12g / L, and the number of sodium dodecyl drops is 110; the temperature of the electroplating solution is 52°C, and the voltage 6V, current density 3A / dm 2 , The electroplating time...
Embodiment 3
[0047] According to the method of the present invention, a Ni metal bonding layer with a thickness of 300 μm is electroplated on the pretreated CuCrZr substrate, and 14 to 60 mesh corundum sand is used for sandblasting, and then the Ni bonding layer is heated at 60° C. to 150 Preheat within ℃ range. The WC-12Co working layer is sprayed by supersonic flame spraying method, and the temperature is controlled at about 170°C during spraying. During the supersonic flame spraying process, the kerosene flow rate is 32L / h, the oxygen flow rate is 890NLPM, the spraying distance is 370mm, the powder feeding rate is 45g / min, the barrel size is 6 inches, and the coating thickness is 200μm.
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Abstract
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