Microstructure of sintered Fe-Nd-B magnets

被引：0
|
作者：
Schneider, Gerhard [1 ]
Henig, Ernst-Theo [1 ]
Missell, Frank P. [1 ]
Petzow, Guenter [1 ]
机构：
[1] Univ de Sao Paulo, Sao Paulo, Brazil
来源：
| 1990年 / 81期
关键词：
Iron and Alloys - Magnetic Properties - Iron Neodymium Boron Alloys - Microstructure - Metallography - Grain Size and Shape - Powder Metallurgy - Sintering;
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摘要：
The importance of microstructure in determining the magnetic properties, especially the coercivity, of sintered Fe-Nd-B magnets is discussed. The importance of non-ferromagnetic phases which may increase internal demagnetizing fields or reduce intergranular coupling is reviewed. A metastable, magnetically soft phase with a Curie temperature of 245°C, present in the intergranular regions of sintered magnets, is dissolved by the 600°C heat treatment, improving the coercivity of annealed magnets. The grain-size distribution and its evolution during sintering are presented. Anisotropic grain shapes are discussed in relation to coercivity.
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