MANUFACTURE OF WEAR RESISTANT HIGH PERMEABILITY ALLOY FOR MAGNETIC RECORDING/REPRODUCING HEAD AND MAGNETIC RECORDING/REPRODUCING HEAD

摘要

PURPOSE:To obtain a high permeability alloy for magnetic recording/reproducing head excellent in magnetic properties in A.C. magnetic fields and wear resistance and easy to forging by subjecting a rolled sheet of an alloy prepared by adding specific elements as accessory components to an Fe-Ni alloy with a specific composition to heat treatment under specific conditions. CONSTITUTION:A ferrous alloy having a composition containing, by weight, 30-90% Ni and 0.001-5%, in total, of Sr and/or Ba is melted in a nonoxidizing atmosphere, to which 0.01-30%, in total, of one or more kinds among =30% Cu, =15% each of W, Nb, Ta, and Mn, =10% each of Mo and Co, =5% each of Cr, V, Ti, Si, etc., =3% each of Al, Zr, Hf, etc., and =2% each of Be, Sn, Sb, B, and P are added as accessory components. An ingot of the above alloy is rolled into sheet-like state, and this sheet is heated in a nonoxidizing atmosphere up to a temp. between 600 deg.C and the melting point for 1min-10hr and cooled from =600 deg.C down to ordinary temp. at a cooling rate in a wide range between 100 deg.C/sec and 1 deg.C/hr and, further, heated in a nonoxidizing atmosphere at =600 deg.C for 1min-100hr, if necessary, and cooled.