| 摘要 |
PROBLEM TO BE SOLVED: To provide an isotropic rare earth bonded magnet having maximum energy product (BH) max equal to or higher than an isotropic rare earth bonded magnet in room temperature and also having irreversible demagnetization factor (heat resisting property). SOLUTION: This rare earth bonded magnet is composed of magnetic powder, having main component composition indicated in atomic % of Rα T100-(α+β+γ+δ) Mβ BγNδ (R indicates one or two or more kinds of Y-containing rare earth element containing Sm, T indicates Fe or Fe and Co, M indicates one or two or more kinds of Al, Ti, V, Cr, Mn, Cu, Ga, Zr, Nb, Mo, Hf, Ta and W in 5<=α<=18, 0<=β<=50, 0<=γ<=5 and 4<=δ<=30) and binding resin. The maximum energy product (BH) max in room temperature is 7.5 MGOe or higher, and the irreversible demagnetization factor when the above-mentioned material is returned to room temperature from heating for 500 hours at 200 deg.C in the atmosphere in permeance coefficient (Pc)=2 should be 6.5% or lower. |
