Abstract
This report relates to magnetic properties of sintered Alnico type permanent magnet. The effects of history of iron powders, degree of oxidation of iron, nickel, cobalt, and copper powders, degree of evacuation and sintering time, and magnetic field cooling rate were investigated. Forming pressure, sintering temperature, degree of evacuation in sintering process, magnetic field cooling rate (900-700°C) of sintered permanent NKS-3 magnet are 6T/cm2, 1270-1300°C (NKS-1DA : 1350°C), 10 -1-10-3mmHg, 3-13 minute respectively.Carbonyl, reduced (MH-300⋅P) and electrolytic iron powders are adequate for producing sintered NKS permanent magnet, and magnetic properties are improved by reducing iron, nickel, cobalt and copper powders, with hydrogen. At least lhr was necessary at 1300°C for obtaining well sintered product.The best times of magnetic field cooling are 5-7 and 10 min. for titanium and silicon addition respectively. Addition of titanium reduces both remanence and maximum energy product value but increases coercive force.
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