Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1997-12-19
1999-09-21
Jones, Deborah
Stock material or miscellaneous articles
Composite
Of silicon containing
428457, 428469, 428494, 428681, 428689, 428704, 524417, 336219, C23C 3000
Patent
active
059552018
ABSTRACT:
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.
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Brown Jack L.
Loudermilk Dannie S.
Armco Inc.
Bunyard Robert J.
Fillnow Larry A.
Jones Deborah
Savage Jason
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