| 摘要 |
PURPOSE:To facilitate powder pressing and molding so that a dust core whose dielectric breakdown is hard to occur can be manufactured, by powder-pressing and molding amorphous alloy powder which consists of one or two species of Fe, Cr, P, and C or B and has specified composition of atomic percentage, and by performing heat treatment at a temperature lower than a crystallization temperature. CONSTITUTION:An alloy consisting of one or two species of Pe, Cr, P, and C or B and having composition shown in atomic percentage formula; Fe100-a-b- c.Cra.Pb(C,B)c(1<=a<=8, 5<=b, 15<=b+c<=30), is powderpressed and molded. when a small amount of insulating material is mixed with this alloy and successively when the mixture is molded or when the surface of the powder is coated with an insulating film, frequency characteristics are more improved and a threshold frequency is enlarged. Though heat treatment is usually performed under a non-magnetic field above a Curie point, the characteristics can be occasionally further improved by performing the heat treatment under the magnetic field. When this amorphous alloy dust core is manufactured, irregular-shaped powder of 3.5 g/cm<3> or less in apparent density is available for alley powder.
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