| 摘要 |
PROBLEM TO BE SOLVED: To obtain a magnet having reliable, high magnetic characteristics by adding a specified quantity of hydrocarbon lubricant to a coarse powder material and jet-mill pulverizing the material within inert air flow of specified oxygen concentration. SOLUTION: In a method of manufacturing rare earth sintered magnet comprising pulverizing coarse powdery material for R-Fe-B rare earth sintered magnet (where R is one or more rare earth elements including Y), pressing it a magnetic field, sintering and subjecting the material to heat treatment, after 0.01 to 0.10 wt.% hydrocarbon lubricant is added to the coarse powder material, the resultant material is pulverized in inert gas air flow of oxygen concentration of 0.005 vol.% or less using jet-mill. Next, the pulverized powder is placed within inert gas and recovered into any or two or more mixture oils from among mineral oil, synthetic oil and vegetable oil to be formed into slurry. Using the slurry, pressing in magnetic field is performed. Subsequently, deoiling, sintering and heat treatment are conducted. |
