Method for testing orientation silicon iron coating surface tension stress
A technology of grain-oriented silicon steel and tensile stress, applied in the field of grain-oriented electrical steel testing, can solve the problems of high cost, high test environment requirements, and long measurement cycle.
Active Publication Date: 2009-01-28
SHOUGANG CORPORATION
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Although the measured data of X-ray diffraction method is relatively accurate, the measurement pe
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[0061] Randomly select several pieces of grain-oriented silicon steel samples, and use this method for testing. The results are as follows:
[0062]
[0063]It can be seen from the table that under different coating amounts, a series of tensile stress and iron loss reduction values can be obtained by changing the pickling time. These values are basically the same as the actual tensile stress iron loss reduction values experienced in practice.
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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...
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Inventor 耿立王崇学王全礼罗文彬倪献娟
Owner SHOUGANG CORPORATION
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