Thermal spraying insulating coating and preparation method thereof

Abstract

The invention discloses a thermal spraying insulating coating. The thermal spraying insulating coating comprises a bottom coating, a compact aluminum oxide intermediate layer and a porous aluminum oxide surface layer, wherein the bottom coating is located on the surface of a substrate, the bottom coating is formed through a plasma spraying process, the thickness of the bottom coating is 50-100 microns, the compact aluminum oxide intermediate layer is arranged on the surface of the bottom coating, the compact aluminum oxide intermediate layer is formed by adopting fine-particle-size aluminum oxide powder through the plasma spraying process, the thickness of the compact aluminum oxide intermediate layer is 100-200 microns, and the porous aluminum oxide surface layer is arranged on the outersurface of the compact aluminum oxide intermediate layer. Compared with a traditional coating, the thermal spraying insulating coating has the advantages that a fine-particle-size aluminum oxide coating is adopted as a filtering layer, a relatively compact coating structure can be formed, and the insulating strength is improved; the porous surface layer is sprayed by adopting coarse-particle-sizealuminum oxide, so that the toughness of the coating can be improved; and polysiloxane is adopted to replace an epoxy resin hole sealing agent, so that the insulation and temperature resistance are better.

Description

technical field [0001] The invention belongs to the field of thermal spraying insulating coatings, and more specifically relates to a thermal spraying insulating coating. At the same time, the invention also relates to a preparation method of thermal spraying insulating coating. Background technique [0002] Electrically insulated bearings adopt a special spraying process to spray high-quality film on the outer surface of the bearing. The film has strong bonding force with the substrate and good insulation performance, which can avoid the electric corrosion effect of the induced current on the bearing and prevent the current from affecting the grease and rolling elements. , The damage caused by the raceway improves the service life of the bearing. This process has been continuously improved. In insulated bearings, there is a layer of 100μm thick coating on the surface of the outer ring or inner ring, which can withstand a voltage of up to 1000VDC. The special spraying proce...

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Problems solved by technology

[0003] However, in the existing technology, insulated bearings usually use plasma spraying process to spray aluminum oxide coating on the surface, which has problems such as poor bonding strength, low withstand voltage strength, and difficulty in bearing high-speed loads. Therefore, we propose a thermal spraying insulation Coating and method for its preparation

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