| 摘要 |
PURPOSE:To obtain a high permeability alloy easy to heat-treat and having >=4,000 initial permeability in a low temp. region belot room temp. by restricting the amount of 2Mo+Fe+Cu in an alloy having a specified composition consisting of Ni, Mo, Cu and Fe. CONSTITUTION:This alloy consists of, by weight, 74-80% Ni, 0.5-4.5% Mo, 0.5-6.5% Cu and the balance Fe and satisfies 23%<=2Mo+Fe+Cu<=27%. The alloy is heated at about 1,000 deg.C- the m.p. in a nonoxidizing atmosphere or vacuum for about 10min-100hr, and it is cooled to ordinary temp. at 1,000- 0.1 deg.C/min cooling rate. Before carrying out the cooling, the alloy may be cooled to ordinary temp. and further heated at about 300-700 deg.C in a nonoxidizing atmosphere or vacuum for 10min-100hr. The alloy shows a significant effect as the material of a shielding case used at a temp. below room temp. |
