Patent ID: 6406559
Filing Date: 2002-06-18
Classification: H01F

Abstract:
A method of manufacturing a magnetic material, the method comprisinga step of preparing a mother alloy by liquid rapid cooling, mechanical alloying, or mechanical grinding, the mother alloy comprising a composition essentially represented by a general formula R1XR2YBZM100-X-Y-Z, where R1 denotes at least one element selected from rare earth elements,R2 denotes at least one element selected from Zr, Hf and Sc, M denotes at least one element selected from Fe and Co, and X, Y and Z are numbers satisfying 2 at. %&lE;X, 0.01 at. %&lE;Y, 4 &lE;X+Y &lE;20 at. %, and 0&lE;Z &lE;10 at. %, respectively; a step of heat treating the mother alloy at a temperature of 573 to 1273 K in an inert gas atmosphere or vacuum to obtain a TbCu7 crystal phase as a principal phase of the mother alloy; and a step of introducing nitrogen into the heat treated mother alloy to obtain the magnetic material comprising the TbCu7 crystal phase as a principal phase, wherein the step of introducing nitrogen comprises heat treating the mother alloy in a mixed gas of ammonia gas and hydrogen gas satisfying a partial pressure ration of 3y/Px, where Py is the partial pressure of the hydrogen gas in the mixed gas and Px is the partial pressure of the ammonia gas in the mixed gas.