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Composite ceramic coating for motor insulation bearing and preparation method of composite ceramic coating

A technology of insulating bearings and composite ceramics, which is used in coatings, metal material coating processes, and devices for coating liquids on surfaces, etc., to achieve the effects of wide temperature adaptability, low cost, and excellent impact toughness

Active Publication Date: 2021-10-26
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the domestic bearing industry's research on ceramic sprayed insulated bearings is still in its infancy, and none of them has really mastered the core key technologies, especially the design of coating materials for wind turbine insulated bearings, coating structure design, coating preparation technology, and coating performance. There is a huge gap in detection technology and standards, and it is basically in a blank state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The manufacturing process of motor insulated bearings is: 1 degreasing → 2 drying → 3 masking treatment → 4 sandblasting → 5 high-speed arc spraying metal transition layer → 6 plasma spraying ceramic insulating layer → 7 air atomization spraying polymer sealing layer → 8 Bearing ring end face sealing treatment→9 Coating surface grinding→10 Ultrasonic cleaning→11 Drying→12 Coating non-destructive testing→13 Bearing assembly→14 Inspection→15 Packing and storage.

[0043] The specific preparation method of the insulating bearing of the motor comprises the following steps:

[0044] 1. Degreasing: The electric heating water tank is used as the degreasing device, and the bearing ring is impregnated with water-based alkaline cleaning agent to remove the oil pollution caused by mechanical processing. Oil pollution has a strong influence on the bonding strength of the coating. The formula of water-based alkaline cleaning agent is: sodium carbonate 50g / L, sodium orthosilicate 45...

Embodiment 1

[0062] A kind of composite ceramic coating for electrical insulation bearings in this embodiment is to process the composite ceramic coating on the inner peripheral surface of the inner ring of the ordinary bearing and the outer peripheral surface of the outer ring, and process the resin insulating layer on the upper and lower end faces of the bearing , the composite ceramic coating includes a metal transition layer, a ceramic insulating layer and a polymer sealing layer that are attached to the bearing surface in sequence from the inside to the outside. The thickness of the metal transition layer is 0.1mm, and its material is 1.6mm in diameter. 97wt%Cu-3Alwt% Cu-7Al metal wire; the thickness of the ceramic insulating layer is 0.1mm, and the material is Si with a purity ≥ 99.95% and a powder particle size range of 1.0-5.0μm 3 N 4 Powder, α-Al 2 o 3 Powder and CeO 2 Powder, the ratio between the three is 80wt% Si 3 N 4 +19.8wt%Al 2 o 3 +0.2wt%CeO 2 , when the mixed pow...

Embodiment 2

[0081] A kind of composite ceramic coating for electric motor insulation bearing of the present embodiment, the thickness of metal transition layer in the composite ceramic coating is 0.1mm, and its material is the Cu-7Al that specification is diameter 1.6mm, and composition is 97wt%Cu-3Alwt%. Metal wire; the thickness of the ceramic insulating layer is 1.2mm, and its material is Si with a purity of 99.95% and a powder particle size range of 1.0-5.0μm 3 N 4 Powder, α-Al 2 o 3 Powder and CeO 2 Powder, the ratio between the three is 90wt% Si 3 N 4 +9.5wt%Al 2 o 3 +0.5wt%CeO 2 , when the mixed powder is used, it will be mixed with its quality 0.5% polyvinyl alcohol binder, and after freeze-drying and granulation, the compound raw material for spraying is obtained; the thickness of the polymer sealing layer is 0.05mm, and its material is that the volume ratio is 4: 1 silicone modified acrylic resin paint and special thinner.

[0082] Its specific preparation method compr...

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Abstract

A composite ceramic coating for a motor insulation bearing comprises a metal transition layer, a ceramic insulation layer and a polymer sealing layer, the metal transition layer is formed by spraying 93 wt% of Cu and 7 wt% of Al, the ceramic insulation layer is formed by mixing and spraying mixed powder and a polyvinyl alcohol binder accounting for 0.5% of the mass of the mixed powder, the mixed powder comprises 80-90 wt% of Si3N4, 9.5-19.8 wt% of alpha-Al2O3 and 0.2-0.5 wt% of CeO2, and the raw materials of the macromolecular sealing layer are organic silicon modified acrylic resin paint and a diluent. The composite ceramic coating is specially suitable for extremely severe environments such as seaborne and land, has the advantages of being high in bonding strength, high in toughness, not prone to stripping, wide in temperature adaptation range, high in density and low in cost, and the motor insulation bearing can resist the erosion of shaft current on the basis of having excellent mechanical properties, so that the requirement of the bearing for resisting the ablation of the shaft current is met.

Description

technical field [0001] The invention relates to the technical field of manufacturing electrical insulating bearings, in particular to a composite ceramic coating for electrical insulating bearings and a preparation method thereof. Background technique [0002] As a clean and renewable energy, wind energy has been paid more and more attention by countries all over the world. China's wind energy reserves are large and widely distributed. In the past five years, the world wind energy market has been growing at a rate of 40% every year. It is estimated that in the next 20-25 years, the world wind energy market will increase by 25% every year. With the rapid development of the wind power industry in recent years, the current domestic large-scale wind turbine manufacturing technology has become mature, and as the core technology of wind turbines - wind turbines are monopolized by foreign countries, which has become a major bottleneck restricting the development of wind power. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/08C23C4/10C23C4/131C23C4/134B05D7/16
CPCC23C4/131C23C4/134C23C4/08C23C4/10B05D7/16B05D2203/30Y02E10/72
Inventor 田保红张毅周孟傅丽华刘勇薛启明张志阳
Owner HENAN UNIV OF SCI & TECH
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