Electromagnetic steel sheet having insulating coating film with excellent thermal conductivity therein, and process for production thereof
A technology of insulating cover and electromagnetic steel sheet, applied in the field of electromagnetic steel sheet, can solve the problems of reduced space factor, insufficient thermal conductivity of insulating cover film, insufficient heat dissipation, etc.
Active Publication Date: 2015-05-20
NIPPON STEEL CORP
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Problems solved by technology
[0010] In this way, especially when the thickness of the laminated iron core is relatively short relative to the diameter of the engine, the heat dissipation from the end face of the laminated iron core is ineffective, and when the heat conduction from the installation position of the radiator plate to the lamination direction is effective, the heat dissipation performance is improved. not enough
This is because in the conventional electrical steel sheet, the insulating coating does not have sufficient thermal conductivity.
[0011] In addition, there are also insulating coatings with relatively high thermal conductivity, but the characteristics such as adhesion, corrosion resistance, workability, and insulation required for insulating coatings of general electrical steel sheets cannot be obtained.
In addition, the duty cycle also decreases
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[0044] Under the conditions shown in Table 2, the coating liquid shown in Table 1 was coated on the surface of a non-oriented electrical steel sheet having a thickness of 0.35 mm and containing Si: 2.5%, Al: 0.5%, and Mn: 0.05%. As a dichromate, combine chromium flakes with Mg(OH) 2 , Al(OH) 3 , CaO, SrCO 3 Mix and heat metal hydroxides, oxides or carbonates to prepare metal dichromate, using 50% aqueous solution.
[0045] Regarding organic resins, styrene resin, acrylic resin, and epoxy resin were used as 30% emulsion solutions, and polyimide resins were used as 30% dispersion solutions. Furthermore, a predetermined amount of reducing agent was added to prepare a coating solution having the composition shown in Table 1. In addition, the numerical value on the right side of the column "organic resin: parts by weight" in Table 1 represents the weight of the organic resin relative to 1 part by weight of dichromic acid, and the numerical value in () on the left side represents...
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Abstract
An electromagnetic steel sheet comprises an electromagnetic steel sheet and an insulating coating film formed on the surface of the electromagnetic steel sheet. The insulating coating film is mainly composed of: a chromic acid metal salt; and a mixture or a copolymer of one or more members selected from a styrene resin, an acrylic resin, an epoxy resin and a polyimide resin, which has a rate of crystallization of 10 to 50% and is contained in an amount of 0.01 to 0.5 part by weight relative to 1 part by weight of the chromic acid metal salt (in terms of the CrO3 content). In the insulating coating film, a chromium hydroxide compound is contained as a chromic acid compound in an amount of 30% or more in terms of the chromium (III) oxide (Cr2O3) content relative to the total amount (100%) of the chromic acid compound in terms of the chromium (III) oxide (Cr2O3) content.
Description
technical field [0001] The present invention relates to an electrical steel sheet having an insulating coating film excellent in thermal conductivity, which is suitable for iron cores of electrical equipment, and a method for producing the same. Background technique [0002] In recent years, there has been a strong demand for higher efficiency and miniaturization of electrical equipment from the viewpoint of global environmental protection and global power and energy conservation. Various technologies have been developed for increasing the efficiency and miniaturization of electrical equipment. For electrical steel sheets used for iron cores of motors, small transformers, and the like, improvements in magnetic properties, workability, and the like are required. [0003] It is effective to suppress the heat generation (Joule heat) of the engine for the above-mentioned high efficiency and downsizing of the electric equipment. Conventionally, this has been achieved by improvi...
Claims
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IPC IPC(8): C23C22/00B32B15/08C23C22/28H01F1/18
CPCC23C22/28H01F1/18
Inventor 竹田和年小菅健司永川真治稻冈修
Owner NIPPON STEEL CORP