| 摘要 |
PURPOSE:To provide a titled alloy which is suitable for a magnetic core for a high frequency used in the state of a high magnetic flux density and has a small iron loss by specifying the compsn. consisting of Fe, Ni, Si and B and subjecting the same to rolling and quick cooling. CONSTITUTION:An alloy consisting of (Fe1-aNia)100-x-ySixBy (where 0.2<=a <=0.7, 1<=x<=20, 5<=y<=9.5, 15<=x+y<=30) is ejeced by pressurizied gaseous argon in a molten stage from a quartz nozzle into the space between the two rolls under high speed rotation, whereby a low iron loss amorphous alloy is obtd. The resin for limiting the compsn. components in the above-mentioned alloy lies in that Ni contributes to a decrease in iron loss at a high frequency but that, if it is <0.2atom%, the effect is lessened, and at >0.7%, the magnetic flux density decreases, thus making the alloy impractical. The magnetic flux density is additionally improved with correspondingly decreased iron loss if the Ni is incorporated at the range of 0.3<=a<=0.45. If B is not added within the above- mentioned range, it is difficult to obtain an amorphous alloy and the iron loss is considerably decreased by incorporating the same at the range of 5<=y<=7. Si assists the formation of the amorphous alloy and decreases the iron loss in the above-mentioned range. |
