HEAT TREATMENT METHOD FOR AMORPHOUS MAGNETIC ALLOY SHEET

摘要

PURPOSE:To enhance the magnetic characteristics of an amorphous magnetic alloy sheet by heat treating the sheet with a heating element in a specific temp. range including the crystallization temp. in such a short time that crystallization does not occur. CONSTITUTION:Ribbon-shaped sheet 2 of amorphous magnetic alloy wound round supply reel 1 is run on heating element 6 at a fixed speed through guide rolls 4, 5. Element 6 is made of heat resistant steel, and it heats sheet 2 in the temp. range from the crystallization temp.-200 deg.C to the crystallization temp.+50 deg.C. The element may be formed into a roller shape 9, and sheet 2 may be heated by being pressed to the roller with pressing roller 10. The heat treatment is carried out in such a short time that the sheet is not crystallized. By the heat treatment an amorphous sheet is obtd. having increased permeability, lowered coercive force, and enhanced magnetic characteristics.