IEC 60404-12:2023 磁性材料.第12部分:电工钢带和薄板表面绝缘涂层耐热性评定的试验方法
标准编号：IEC 60404-12:2023
中文名称：磁性材料.第12部分:电工钢带和薄板表面绝缘涂层耐热性评定的试验方法
英文名称：Magnetic materials - Part 12: Methods of test for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet
发布日期：2023-02-10
标准范围
IEC 60404-12:20 23适用于IEC 60404-1-1中分类的电工钢带和钢板的表面绝缘涂层。本文件规定了评估电工钢带和钢板表面绝缘涂层耐热性试验的一般原则和技术细节。通过评估由于在高达850℃的指定温度下持续高达2 500小时的指定持续时间的热处理而导致的表面绝缘涂层的指定性质的变化来进行评估。在(23±5)℃的环境温度下，在没有热处理的情况下和热处理后测定规定的性能。与上一版相比，此版本包括以下重大技术变更:粘合测试方法已被修改以匹配ISO 1519中规定的弯曲测试方法，使用直径为32mm的圆柱形心轴代替第一版中规定的直径为30mm的心轴；对层间绝缘电阻的测试方法进行了修改，以符合IEC 60404-11中规定的方法，并删除了修改后的Franklin测试；修改了压缩性测试方法，使其与IEC 60404-13中规定的堆叠系数测试方法相匹配；“阻力等级”的概念已被删除；在额定温度高于500°C时使用的夹紧压力已降低至（0.01±0,001）N/mm2；连续暴露测试已成为制造商和购买者之间协议的主题，该程序已移至资料性附件A。
IEC 60404-12:2023 is applicable to surface insulation coatings on electrical steel strip and sheet classified in IEC 60404-1-1.
This document defines the general principles and technical details of the tests for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet.
The assessment is made by evaluating the change of a specified property of the surface insulation coating due to a heat treatment at a specified temperature up to 850 °C for a specified duration time up to 2 500 h. The specified property is measured at an ambient temperature of (23 ± 5) °C both without heat treatment and after heat treatment.
This edition includes the following significant technical changes with respect to the previous edition:
- the method of test for adhesion has been modified to match to the method of bend test specified in ISO 1519 using a cylindrical mandrel of 32 mm in diameter instead of the 30 mm diameter mandrel specified in the first edition;
- the method of test for interlaminar insulation resistance has been modified to match to the method specified in IEC 60404-11 and the modified Franklin test has been removed;
- the method of test for compressibility has been modified to match to the method of test for stacking factor specified in IEC 60404-13;
- the concept of "resistance grades" has been removed;
- the clamping pressure to be used at temperature ratings above 500 °C has been reduced to (0,01 ± 0,001) N/mm2;
- the testing for continuous exposure has been made a subject to an agreement between the manufacturer and the purchaser and the procedure has been moved to an informative Annex A.
标准预览图
