| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet excellent in magnetic properties by suppressing fine R rich phase regions in a cast R-T-B system alloy ingot to obtain an alloy ingot having a very homogenized system for the purpose of evenly distributing the R rich phase in a magnet. SOLUTION : The surface of a casting roll 3 is roughened finely so that a liquid alloy 1 cannot enter the roughened fine surface of the roll by its viscosity. As a result, the casting die surface side of an alloy 4 is not cooled quickly, and the growth of the fine R rich phase is suppressed. COPYRIGHT : (C)2003, JPO |
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