Patent ID: 8728390
Filing Date: 2014-05-20
Classification: B22F,C23C,H01F

Abstract:
1. A method of making a magnet, the method comprising: forming a coating on an alloy powder by physical vapor deposition to form a coated powder, the alloy powder comprising neodymium, iron, boron and other metals, the coating comprising a component selected from the group consisting of dysprosium, terbium, iron, and alloys thereof; vibrating the alloy powder during formation of the coating; and forming a permanent magnet from the coated powder, the permanent magnet having a non-uniform distribution of dysprosium and/or terbium such that the permanent magnet includes from about 0.01 to about 8 weight percent dysprosium and/or terbium of the total weight of the permanent magnet and a surface concentration of dysprosium and/or terbium is from about 3 to about 50 weight percent of the total weight of the coating layer.