发明名称 |
PROCESS OF MANUFACTURE OF R-Fe-B PERMANENT MAGNETS |
摘要 |
FIELD: metallurgy. SUBSTANCE: in agreement with proposed process there are used finely ground powders produced by method of comminution of ingot or by method of Ca thermal reduction or by method of squeezing out of ingot from mould. Alloys are subjected to coarse comminution by grinding or by absorption of H<SB>2</SB> and decomposition and later are ground finely mechanically or in vortex mill with production of fine powder of R-Fe-B with average size of particles between 1,0-10 ??¼.. Then these powders are compacted in mould with compaction density of 1.4- 3.5 g/cu.cm and pulsating magnetic field having intensity bigger than 10.0 kOe is applied to mould with repeated inversion of magnetization vector. Finally cold isostatic compaction in static magnetic field is carried out. Produced magnets display excellent compaction characteristics, high degree of orientation of magnetization vector of each crystalline grain and total sum A+B, where A-(BH)<SB>max</SB> and B-iHc(koe), that is greater than 59.5. EFFECT: increased efficiency of process. 20 cl, 4 tbll |
申请公布号 |
RU2112627(C1) |
申请公布日期 |
1998.06.10 |
申请号 |
RU19950117066 |
申请日期 |
1995.10.06 |
申请人 |
SUMITOMO SPESHIAL METALZ KO., LTD. |
发明人 |
JUDZI KANEKO;NAOJUKI ISIGAKI |
分类号 |
B22F3/12;B22F3/00;H01F1/057;H01F1/08;H01F41/00;(IPC1-7):B22F3/12 |
主分类号 |
B22F3/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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