SURFACE TREATMENT OF MAGNETIC METAL POWDER

摘要

PURPOSE:To improve oxidation resistance and dispersion properties by performing surface treatment of a magnetic metal powder which consists of iron or mainly consists of iron with a benzoic acid derivative having a substituted group at meta or para position. CONSTITUTION:A magnetic metal powder which consists of iron or mainly consists of iron is subject to surface treatment with a benzoic acid derivative (substituted benzoic acid derivative compound) having a substituted group at meta or para position. Namely, the magnetic metal powder may be subject to surface treatment using a substituted benzoic acid derivative compound by normal method, but preferably the magnetic metal powder should be dipped into a treatment solution where a substituted benzoic acid derivative compound is dissolved or dispersed into aromatic organic solvent. Substituted benzoic acid derivative chemical compound used includes for example P-amino benzoic acid and P-methoxy benzoic acid. It allows oxidation resistance and dispersion properties to be improved also for a magnetic metal powder with a high specific surface area.