Coating structure with sandwich nano ceramic layer and preparation method of coating structure

Abstract

The invention relates to the field of material surface engineering, and particularly relates to a coating structure with a sandwich nano ceramic layer and a preparation method of the coating structure. The coating structure with the sandwich nano ceramic layer disclosed by the invention comprises a transition layer and a ceramic layer, wherein one surface of the transition layer and a base body are in metallurgical bonding; the other surface of the transition layer and the ceramic layer are in metallurgical bonding; the ceramic layer is a sandwich structure ceramic layer; common ceramic layers are arranged on the upper and lower layers; and the nano ceramic layer is arranged in the middle layer. The coating with the sandwich nano ceramic layer has excellent high temperature resistance and relatively good tenacity and malleability, and is wide in use and long in service life. According to the preparation method of the coating structure disclosed by the invention, different coating structures with the sandwich nano ceramic layers can be prepared on various high-temperature alloy surfaces; the method is simple and efficient, and is contributed to reserving the nano characteristics of the coating.

Description

technical field [0001] The invention relates to the field of material surface engineering, in particular to a coating structure with a sandwich nano-ceramic layer and a preparation method. Background technique [0002] In the high-temperature material industry, due to the increasingly high heat resistance requirements of materials in the working environment, pure metal materials can no longer meet the requirements. At the same time, ceramic materials have excellent wear resistance, corrosion resistance, heat resistance and high temperature oxidation resistance, but their applications are limited due to their high brittleness, poor fatigue resistance, sensitivity to stress and cracks, and difficulty in processing. . Therefore, people gradually use ceramic coating as a surface protection layer to form a metal / ceramic composite material on the metal surface, organically combining the characteristics of the base metal and the surface ceramic coating, and giving full play to the...

AI Technical Summary

Problems solved by technology

Because the laser has fast heating and cooling speed, it is an ideal method for preparing nano-coatings, but its controllability is poor, so the obtained nano-ceramic structures are diverse, and the surface stress is large, which is easy to peel off

The yttria partially stabilized zirconia thermal barrier ceramic coating (YPSZ) processed by electron beam physical vapor deposition (EB-PVD) is low in preparation efficiency and high in cost, although the overall coating is nanostructured.

Due to the above reasons, there is no substantial technological breakthrough for high-temperature nano-ceramic coatings, which limits its application range.

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