| 摘要 |
PROBLEM TO BE SOLVED: To obtain an extremely thin sendust sheet having extremely excellent magnetic properties by obtaining a sintered body having an F-enriched phase and an Si-enriched Fe-Si solid solution phase, subjecting this stock to cold rolling, impregnating the cold rolling stock with Al and annealing this Al- impregnated material. SOLUTION: Preferably, the content of Si in the sintered body is 8.3 to 11.7 wt.%, additionally, the content of Al is 0 to 2.0 wt.%, and the balance Fe with inevitable impurities. The thickness of the sintered body is preferably controlled to <=5 mm. A powdery mixture obtd. by blending Fe powder and Fe-Si powder in a prescribed ratio is formed into the sintered body by a powder metallurgical method to produce a rolling stock of the sintered silicon steel in which an Fe-enriched phase enough in expansibility is remained, this is subjected to cold rolling, both sides of the obtd. rolled silicon steel sheet are stuck with Al by a vacuum deposition method, a sputtering method, a CVD method or the like, and, after that, heat treatment is executed to diffuse it to the inside of the thin sheet, by which a sendust thin sheet having extremely excellent magnetic properties is obtd.
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