Preparation method of composite ceramic insulating coating

Abstract

The invention relates to a preparation method of a composite ceramic insulating coating and belongs to the technical field of insulating coating. Boric acid and urea are used as raw materials to prepare nano-scale lamellar boron nitride; then the nano-scale lamellar boron nitride, aluminium hydroxide, magnesium oxide, silica sol and nanometer titanium dioxide are used to prepare an insulating coating; and by the use of glycol, surface tension of a coating liquid is reduced, surface coating strips can be effectively eliminated, the insulating coating has compact and bright surface, contains notoxic chromium element and has good electrical insulating property, adhesiveness and blanking property and high lamination coefficient and good machinable property, and precision and reliability are improved. The surface of the composite ceramic insulating coating has high insulation resistance, tensile stress to a substrate can be generated, and magnetic domain is refined to reduce iron loss. Theinsulating coating has good bonding with the substrate, insulativity of an oriented silicon steel insulating coating can be effectively enhanced, corrosion current density is reduced, corrosion rateis decreased from the perspective of dynamics, and corrosion resistance of oriented silicon steel is enhanced.

Description

technical field

[0001] The invention relates to a preparation method of a composite ceramic insulating coating, which belongs to the technical field of insulating coatings. Background technique

[0002] Rolling bearings are important core basic parts in mechanical equipment, and their performance directly affects the quality, performance and reliability of major equipment and host machines, and are often hailed as the heart parts of mechanical equipment. Electric corrosion is one of the common forms of damage to bearings. When current flows through the bearing, it will cause damage to the bearing, greatly reduce the life of the bearing, and cause the bearing to fail in just a few days or even a few hours. For the problem of bearing electric corrosion, the main measures to solve the current problem are to suppress the shaft voltage, short-circuit the bearing and guide the current to flow to the outside or cut off the current path and prevent it from flowing through the bearin...