Method for testing orientation silicon iron coating surface tension stress

Abstract

The invention discloses a testing method of the pulling stress of oriented silicon-steel coatings, which pertains to a technical field of oriented electric steel testing. The testing method comprises the testing steps of : sample preparing: one side of the oriented silicon-steel coating is protected by a special paint and the other side thereof is dissolved by a solution prepared by hydrogen fluoride, hydrochloric acid and water; the protective paint is removed by acetone as the organic solvent; the special paint relates to shellac and the sample is the oriented silicon-steel piece; testing: the pulling stress which arises between the coating and the silicon-steel piece is calculated according to the bending degree of the steel piece. The testing method has the advantage of low requirements for devices or equipment and is easy to realize. The chemical performance of the testing method is stable when being applied under different weather conditions, thereby shortening the experiment cycle, lowering the experiment cost, ensuring easy operation of testing, additionally, ensuring precise test results and good data repeatability.

Description

technical field [0001] The invention belongs to the technical field of oriented electrical steel testing, and in particular provides a method for testing the surface tensile stress of oriented silicon steel coatings. technical background [0002] Coating is an important process in the production of cold-rolled silicon steel. For oriented silicon steel, although the oriented silicon steel can form a magnesium silicate bottom layer in the final high-temperature annealing process, the insulation performance it can provide is not enough. An insulating coating is then applied for added insulating properties. [0003] With the increase of transformer core power, controlling transformer noise and reducing iron loss has become an important issue. Hysteresis and compressive stress between core laminations are the main causes of transformer noise. Applying tensile stress along the rolling direction and controlling the structure of the magnetic chip perpendicular to the rolling direc...

AI Technical Summary

Problems solved by technology

Although the measured data of X-ray diffraction method is relatively accurate, the measurement period is long, the cost is high, and it has relatively high requirements for the test environment.

Images