Soft magnetic alloy strip, magnetic member using the same, and manufacturing method thereof

A soft magnetic alloy strip produced by the steps of:

• ejecting an alloy melt from a nozzle having a slit onto a rotating metallic cooling roll;
• keeping the cooling roll at a temperature of not less than 80° C. but not more than 300° C. after the lapse of 5 seconds or more following the ejecting of said melt;
• and
• peeling solidified alloy off the cooling roll within a distance of 100 mm to 1500 mm measured along circumference of said roll from a position immediately beneath said nozzle slit to thereby provide the strip having a thickness not more than 30 μm, a width d not less than 10 mm, warpage not more than 0.2×d mm in widthwise direction of the strip, and a continuous length not less than 50 m in longitudinal direction of said strip.

A soft magnetic alloy strip produced by the steps of:

• ejecting an alloy melt from a nozzle having a slit onto a rotating metallic cooling roll;
• keeping a cooling roll surface at a temperature of not less than 80° C. but not more than 300° C. after the lapse of 5 seconds or more following the ejecting of said melt;
• providing a gap not less than 20 μm but not more than 200 μm between said cooling roll and said nozzle tip end, an ejected melt pressure not less than 270 gf/cm2 during the ejecting of said melt, and a cooling roll periphery speed not less than 22 m/s;
• and
• peeling solidified alloy off the cooling roll at a location within the range of 100 mm to 1500 mm measured from a roll position immediately beneath said nozzle slit along a roll circumference so that the strip is provided with a thickness not more than 30 μm, a width d not less than 10 mm, and warpage not more than 0.2×d mm in widthwise direction of the strip, wherein a width of air pockets occurring on a roll contact face of said strip is not more than 35 μm, a length of said air pockets being not more than 150 μm, a centerline average roughness Ra of the roll contact face of said strip being not more than 0.5 μm, and said strip has a continuous length not less than 50 m in longitudinal direction of said strip.

A manufacturing method of a soft magnetic alloy strip, comprising the steps of:

• ejecting an alloy melt from a nozzle having a slit onto a rotating metallic cooling roll to thereby manufacture the alloy strip by a single roll method;
• maintaining a surface temperature of the cooling roll within a range of not less than 80° C. but not more than 300° C. in a period of time elapsing 5 seconds or more after the melt was ejected onto said roll;
• and
• peeling solidified alloy off the cooling roll at a location spaced within a range of 100 mm to 1500 mm along a roll periphery apart from a roll position immediately beneath the nozzle slit.