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公开(公告)号：US5096510A
公开(公告)日：1992-03-17
申请号：US448397
申请日：1989-12-11
CPC分类号： C21D8/125 , C21D8/1238
摘要： The thermal flattening of grain oriented silicon steel which is in the semi-processed condition has improved magnetic properties after a stress relief anneal by using a low temperature and high tension flattening anneal. The flattening process is conducted at a temperature between 1000.degree. to 1435.degree. F. (540.degree. to 780.degree. C.) with a tension selected to produce a yield strength/tension ratio from above 5 to about 20 and preferably from 7 to 13. The yield strength of the material will vary depending on the length of the time at peak temperature but are typically from 400 to 4000 psi (29,200 to 292,000 gm/cm.sup.2). The material as thermally flattened will have at least about 10% stress. After a stress relief anneal above about 1450.degree. F. (785.degree. C.), the material has significantly improved core loss compared to conventional thermally flattened material. The material is particularly suited for wound transformer core applications.
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公开(公告)号：US5955201A
公开(公告)日：1999-09-21
申请号：US994387
申请日：1997-12-19
CPC分类号： H01F1/18 , C04B28/34 , C21D8/1283 , C23C22/74 , C04B2111/00525 , Y02P10/212 , Y10T428/12951 , Y10T428/31678 , Y10T428/31833
摘要： The present invention relates to a nonoriented electrical steel sheet coated on both surfaces with a cured insulative coating for providing a high level of surface resistivity to minimize interlaminar power losses. The cured insulative coating on the steel sheet includes, based upon 100 parts by dry weight, 20-60 parts of aluminum phosphate, 20-70 parts of at least one inorganic particulate silicate and 10-25 parts of an acrylic resin. The cured coating is formed from an acid aqueous suspension that may include up to 1 part by weight of a water-soluble organic solvent per each part of the resin. The aqueous suspension has a pH of about 2-2.5, a silicate particle size of 0.3-60 .mu.m, a resin particle size of less than 1 .mu.m, less than about 0.5 wt. % unreacted phosphoric acid and a specific gravity of about 1.0-1.3. The silicate may be one or more from the group consisting of aluminum silicate, aluminum potassium silicate and magnesium silicate. After curing, the coating has a thickness on each sheet surface of 0.5-8 .mu.m. The insulative coated nonoriented electrical steels may be used to minimize power losses in laminated magnetic cores of motors, generators, transformers, and other electrical equipment.
摘要翻译： 本发明涉及涂覆在两个表面上的具有固化绝缘涂层的无取向电工钢板，以提供高水平的表面电阻率以最小化层间功率损耗。 钢板上的固化绝缘涂层包含基于100份干重量的20-60份磷酸铝，20-70份至少一种无机颗粒硅酸盐和10-25份丙烯酸树脂。 固化的涂层由酸性水悬浮液形成，每个部分树脂可含有至多1重量份的水溶性有机溶剂。 水性悬浮液的pH为约2-2.5，硅酸盐粒度为0.3-60μm，树脂粒度小于1μm，小于约0.5wt。 ％未反应的磷酸，比重约为1.0-1.3。 硅酸盐可以是由硅酸铝，硅酸铝钾和硅酸镁组成的组中的一种或多种。 固化后，涂层在每片表面上的厚度为0.5-8μm。 可以使用绝缘涂覆的无取向电工钢来最小化电动机，发电机，变压器和其他电气设备的层叠磁芯中的功率损耗。
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公开(公告)号：US4347085A
公开(公告)日：1982-08-31
申请号：US256856
申请日：1981-04-23
IPC分类号： H01F1/18 , B05D7/14 , C09D5/25 , C21D1/70 , C23C22/00 , C23C22/08 , C23C22/33 , C23C22/74 , C23C26/00 , H01B17/62 , H01F1/147 , C23F7/10
CPC分类号： H01F1/14783 , C21D1/70 , C21D8/1283 , C23C22/33 , C23C22/74
摘要： An aqueous coating solution for forming an insulative coating directly on electrical steels and on steels having a mill glass thereon. The aqueous solution comprises an aluminum-magnesium phosphate premix solution and a colloidal silica solution. The premix solution also comprises from about 10 to about 45 parts by weight Cr.sub.2 O.sub.3 for every 100 parts by weight H.sub.2 PO.sub.4.sup.- calculated as H.sub.3 PO.sub.4 on a water-free basis, from about 5 to about 20 parts of a compound chosen from the class consisting of boric acid, vanadium pentoxide and mixtures thereof per 100 parts H.sub.2 PO.sub.4.sup.- calculated as H.sub.3 PO.sub.4 on a water-free basis and additional Mg.sup.++ up to that amount which will go into solution. The colloidal silica solution is present in an amount of from that amount which will form a good glass up to 40 volume percent to provide a coating solution having a premix solution to colloidal silica solution volume ratio up to 1.5:1.
摘要翻译： 一种用于直接在电工钢上形成绝缘涂层和在其上具有磨玻璃的钢上的水性涂料溶液。 水溶液包含磷酸铝镁预混物溶液和胶体二氧化硅溶液。 预混物溶液还包含约10至约45重量份的Cr 2 O 3，每100重量份的H 2 PO 4 - 以无水基计算为H 3 PO 4，约5至约20份选自硼酸的化合物 酸，五氧化二钒及其混合物，每100份H 2 PO 4 - 以无水基计算为H 3 PO 4，并加入额外的Mg ++至达该溶液的量。 胶体二氧化硅溶液的存在量可以达到最高达40体积百分比的良好玻璃，以提供一种涂料溶液，该涂料溶液的胶体二氧化硅溶液的体积比高达1.5:1。
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