TREATMENT OF MAGNETIC POWDER

摘要

PURPOSE:To prevent the oxidation deterioration during the process for production and using of a magnet by bringing magnetic powder consisting of an intermetallic compd. with a specific phosphorus compd. and exposing the same to an oxygen-contg. atmosphere. CONSTITUTION:The magnetic powder consisting of the intermetallic compd. contg. a rare earth element such as Sm and ferrous metal a sesential constituting components is brought into contact with the phosphorus compd. of a phosphoric acid, etc. having active proton of <=4pKa. The powder is exposed to the atmosphere contg. oxygen such as air simultaneously or after the contact. The exposing time is usually several minutes to several hours. The powder is substantially kept free from oxidation during the process of production and use of the magnet when the rare earth magnet powder treated by the above- mentioned method is used. The safe and easy production of the rare earth plastic magnetic having a magnetic characteristic is thus made possible.