| 摘要 |
PROBLEM TO BE SOLVED: To increase the throughput of a material to be treated and to make a bonded magnet possess superior magnetic characteristics by a method wherein the material to be treated ground roughly into a specified particle diameter is subjected to nitride treatment on a specified nitride condition using a heating furnace having a specified structure. SOLUTION: An ingot, which consists of R=10 to 12at% (R: is at least one kind of a rare-earth element of rare-earth elements including Y and contains 50% or higher of Sm.) and T:88.5 to 90.5at% (T: Fe or part of Fe is substituted with 30% or lower of Co.), is subjected to solution heat treatment and thereafter, the cast mass is formed into roughly ground powder consisting of compounds, which consist of particles of a particle diameter of 150μm or shorter and at least 90vol.% or higher of which have a Th2 Zn17 type structure. This powder is charged in an inner heat type heating furnace, is heated and held for 5 to 50 hours at 350 to 550 deg.C in 50 to 2000atm. of N2 gas and thereafter, the powder is cooled to obtain roughly ground powder, which contains R=8.5 to 10.5at%, T=76 to 78at% and N=12 to 15at% and chiefly has the Th2 Zn17 type structure. Then, a lubricant is added to this powder in such a way that the weight ratio of the lubricant to the powder is 0.1 to 5.0 to 100wt.% and is mixed with the powder and thereafter, the powder is pulverized in inert gas and thereafter, the pulverized powder is mixed with a resin and is molded in a magnetic field. |
