Gradient composite deposite for continuous casting crystallizer copper plate and production method thereof

Abstract

The gradient composite coating layer for continuous casting crystallizer copper plate contains Co in 50-79.9 vol%, Ni in 20-49.9 vol% and Al2O3 grains of size below 0.5 micron in 0.1-10 vol%. The coating is in gradient structure with outwards gradually increased Co and Al2O3 content and decreased Ni content. During production of the composite coating layer, inside amino sulfonate system with Al2O3 grains in 10-80 g / L and size below 0.5 micron added, gradient Co-Ni-Al2O3 coating is deposited onto copper or copper alloy via specific Al2O3 grain activating pre-treatment and electric deposition process. In the activating pre-treatment, FC-4 cation surfactant is used as ion dispersant. The composite Co-Ni-Al2O3 coating may be used in various high temperature wear resisting fields widely.

Description

technical field [0001] The invention relates to a coating layer on the inner surface of a copper plate of a continuous casting crystallizer, a gradient functional composite coating layer with properties of wear resistance, high temperature oxidation resistance, and heat fatigue corrosion resistance and a preparation method thereof, belonging to the field of material surface modification. Background technique [0002] The end of the life of the continuous casting mold is mainly caused by the thermal stress at the thermal interface of the meniscus-shaped metal liquid surface, which will cause permanent deformation of the mold quickly or slowly, thereby shortening the service life of the mold. In order to prevent defects on the surface of the billet and prolong the service life of the mold, surface treatment is generally carried out on the surface of the copper plate of the mold. Due to the existence of the coating, the copper substrate can be protected to reduce wear and tear, ...

AI Technical Summary

Problems solved by technology

It is an ideal coating for the slab crystallizer, but the cost of Co is too high, so the cost of the coating is high. At the same time, its hardness is high and the stress of the alloy coating is large, which makes the coating resistance to alternation poor, so that the Ni-Co alloy App is restricted

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