Nano thermal barrier coating on the surface of high temperature furnace roll and its preparation method

Abstract

The invention discloses a nano thermal barrier coating on the surface of a high-temperature furnace roller and a preparation method thereof, namely, the coating comprises a CoNiCrAlY bonding layer and a nano-ZrO2 nano ceramic operating layer, wherein 6-8% of Y2O3 is added in the nano-ZrO2 nano ceramic operating layer, the powder particle size of the bonding layer is 20-45mu m, the original particle size of nano ZrO2 is 50-100nm, and after the Y2O3 is added in the nano ZrO2, the secondary granulation is performed on the obtained mixture, the particle size of a obtained product is 45-106mu m. The preparation method comprises the following steps: firstly, cleaning the furnace roller, preheating, drying, and carrying out sandblasting treatment on the furnace roller by using an automatic sandblasting machine; then, preparing a middle bonding layer and a nano ceramic operating layer by using a plasma spraying device according to certain process requirements; finally, carrying out hole sealing on the surface of the nano ceramic operating layer through coating by using a hole sealing agent. According to the thermal barrier coating and the preparation method thereof disclosed by the invention, the oxidation resistance, wear resistance, corrosion resistance and scaffolding resistance of the high-temperature furnace roller are effectively enhanced, the service life of the high-temperature furnace roller is prolonged, and the replacement cost and the maintenance cost of the high-temperature furnace roller are reduced.

Description

technical field [0001] The invention relates to a nanometer thermal barrier coating on the surface of a high-temperature furnace roll and a preparation method. Background technique [0002] In the iron and steel industry, the continuous heating furnace is an important equipment for the heat treatment of steel, and the hearth roller is the key component of the roller hearth continuous heating furnace. Erosion and steel heavy load, impact, friction, etc., the working environment is very harsh. At present, high-temperature furnace rolls are generally made of high-chromium-nickel heat-resistant stainless steel, which is prepared by centrifugal casting, which is expensive. However, in harsh environments, the service life of the furnace rolls is low, and the annual cost of replacement and maintenance of the furnace rolls is huge. Therefore, how to reduce the manufacturing cost of the furnace rolls and prolong the service life is generally highly valued. [0003] The main reasons...

AI Technical Summary

Problems solved by technology

However, due to the presence of certain pores and microcracks in the prepared nano-thermal barrier coating, if no post-treatment is performed, such as hole sealing treatment, it is easy to cause corrosion, oxidation, etc. in a high-temperature environment, resulting in nodulation and peeling failure of the coating; and The method of combining supersonic flame spraying and plasma spraying requires two kinds of equipment in the same spraying room at the same time, the process is cumbersome, and it is not conducive to industrial production