Method for Producing Ferrite Powders

摘要

This invention concerns powder metallurgy, more specifically, the production of ferrite powders, and can be used to improve productivity in the manufacture of magnets for grinding operations. A method is known for producing ferrite powders, which consists in ferritization and milling first by the dry process in a vibrational mill, and then wet milling. Here the milling time is 13 to 16 hours. However, when using this method it is necessary to perform long-term milling, and the resulting ferrites have insufficiently high magnetic parameters. The purpose of this invention is to improve the magnetic parameters of the ferrites and also improve the productivity of wet milling. This is achieved by performing, in the known process of producing ferrite powders, wet milling in the presence of water-soluble cellulose derivatives. Here the water-soluble cellulose derivatives are taken in amounts equaling 0.01 to 1.0% by weight of the powder. (ERA citation 07:022346)