Patent ID: 7550047
Filing Date: 2009-06-23
Classification: B22F,C22C,C22F,H01F,Y10T

Abstract:
1. A method of making a magnetically anisotropic magnet powder, the method comprising the steps of: preparing a master alloy by cooling a rare-earth-iron-boron based molten alloy; and subjecting the master alloy to an HDDR process, wherein the step of preparing the master alloy includes the step of forming a solidified alloy layer, including a plurality of R wherein the step of forming the solidified alloy layer includes forming a first texture layer in contact with the cooling member by feeding the molten alloy onto the cooling member and then feeding the molten alloy onto the first texture layer to grow the R wherein the first texture layer consists essentially of R wherein a cooling rate for forming the second texture layer is adjusted to be lower than that for the first texture layer by feeding the molten alloy more slowly when forming the second texture layer than when forming the first texture layer.