| 摘要 |
PROBLEM TO BE SOLVED: To improve an anticorrosion characteristic by forming a high temperature oxide film with a specific thickness under a specific atmosphere on a surface for curved machining of Fe-B-R system permanent magnet, and by being tightly provided with a resin layer having nonvolatile remaining part through which resin solution with a specific density properly permeates. SOLUTION: An anticorrosion permanent magnet is constituted of major contents of 10 atom%-30 atom% of R (R is made of at least one kind of Nd, Pr, Dy, Ho or Tb, or at least one kind of La, Ce, Sm, Gd, Er, Eu, Tm, Yb, Lu or Y), 2 atom%-28 atom% of B and 60 atom%-80 atom% of Fe, and of a laminate film which is made of a high temperature oxide film layer with 1-5μm thickness and an antioxide resin layer on a surface for curved machining of a sintered permanent magnet of which major phase is formed by a tetragonal crystal phase. By the means a anticorrosion characteristic of the Fe-B-R system permanent magnet can be improved by a simple procedure without eliminating the high temperature oxide film on the surface of the magnet body. |
