| 摘要 |
PROBLEM TO BE SOLVED: To relax the shock acting on magnetic powder at the time of collision of the powder and restrain the stress acting on a crystal structure at the time of pulverization, by adding and mixing a lubricant to a magnetic material and then pulverizing the mixture. SOLUTION: Magnetic powder of a magnetic material expressed by a formula RaFe(100-a-b-c)MbNc is prepared (with R contains at least one type of rare earth element including Y and Sm as an essential element at approximately 50at% or more, and M is at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, while a, b and c represent atomic percentages having the relations of 5<=a<=20, 0<=b<=5 and 3<=c<=30, with the remaining portion being Fe). Then, fatty acid as a lubricant is added to and mixed with the magnetic powder. The mixture is then pulverized by using a jet mill, more preferably, an airstream jet mill. Thus, the fatty acid film is caused to exist between colliding substances at the time of collision, thereby providing good lubricity. Thus, the shock acting on the magnetic powder at the time of collision is relaxed, thereby reducing the quantity of defects introduced by pulverization and exhibiting excellent magnetic property. |
