| 摘要 |
PURPOSE:To obtain an iron-base soft-magnetic alloy having high saturation magnetic flux density and excellent in soft-magnetic properties by applying heat treatment to an amorphous foil of Fe-base alloy with a specific composition and forming fine crystals of a specific grain size. CONSTITUTION:An Fe alloy having a composition represented by a general formula FeaCubMcSidBe [where M means >= at least one kind selected from group IVa, Va, and VIa elements of the periodic table, Mn, Ni, Co, and Al, the symbols (b), (c), (d), and (e) stand for 0.01-3.5% by atom, 0.01-15%, 10-25%, and 3-12%, respectively, and the sum of (a), (b), (c), (d), and (e) is 100%, and further, the sum of (d) and (e) is 17-30%] is smelted, and the resulting molten metal is rapidly solidified into an amorphous foil. The foil is formed into a toroidal magnetic core, and this core is held at the crystallization temp. to form 25-90%, by area ratio, of the structure into fine crystals and also form >=80% of the above fine crystals into those of 50-300A grain size, by which the soft-magnetic alloy having high saturation magnetic flux density and excellent in soft-magnetic properties in the high frequency area can be produced. |
