PURPOSE: To produce a thin shaped magnet with good yield by a method wherein rare earth-Fe-B system alloy is refined and powdered, that is, fine grinding is performed after rough grinding, the material is subjected to compression forming in magnetic field and hot extruction process is performed after canning.
CONSTITUTION: An ingot, which is the refined alloy of composition showed by the formula, is subjected to rough grinding by stamping mill and jet mill, then is subjected to fine grinding by jet mill. Thereafter, the said powder is subjected to compression forming in magnet field and canning is performed to a forming body using a can made by iron. In this formula, R means Nd only or combination of Nd and one or more than 2 of the othe rare earth element, and M means combination of one or more than 2 of Al, V, P, W, Ti, Ni, Nb, Cr, Mo, Si, Zr, Hf, Mn, Bi, and Sn and Sb. 0≤X≤0.5, 0.02≤Y≤0.3, 0≤Z≤0.03, 4≤A≤7.5. Consequently, hot extrusion process is performed at within the temperature of 600W 1,150°C and extrusion ratio of 3W20. Thus, a thin shaped magnet can be produced with good yield.
TANIGAWA SHIGEO
YAMAUCHI KIYOTAKA
| JPS59132104A | 1984-07-30 |
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