Steel with electrically insulating hematite layer
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United States of America Patent
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Sep 4, 2001
Issued Date -
N/A
app pub date -
Aug 23, 2000
filing date -
Aug 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to a method of forming an electrically insulating layer on a steel article such as a stack of electrical steel laminations or an individual, unstacked electrical steel lamination, comprising exposing the article to an oxidation atmosphere, and to a temperature (such as at least about 800.degree. F.) for a time sufficient to form on the article an electrically insulating layer comprising hematite. The hematite layer is effective to provide the article with a surface resistivity characterized by an F-amp value of not greater than about 0.85 at a test pressure of 50 psi and a transfer surface roughness of about 10 microinches (Ra). Also featured is a steel article having the electrically insulating layer formed thereon.
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