Warm consolidation of amorphous metallic powder composites for AC applications
Warm consolidation of amorphous metallic powder composites for AC applications
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用于交流应用的非晶态金属粉末复合材料的温固结
DOI：
10.1109/tmag.1987.1065374
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发表时间：
1987
影响因子：
2.1
通讯作者：
T. Masumoto
中科院分区：
文献类型：
--
作者：
S. Minakawa;T. Masumoto
对零磁致伸缩非晶Co 68.8 Fe 4.2 Si 15 B 12粉末进行了用于交流应用的树脂温压成形。通过利用粘性流动的固结，获得了超过90%的填充分数的非晶压块。通过磁导率的频率依赖性评价了复合环形磁芯在高频范围内的磁性能。证实了液态树脂在金属颗粒的电绝缘上比优先占据压坯内的孔的粉末树脂更有效，以减少涡流损耗。聚酰亚胺清漆是，特别是，在这样的耐热性和热固化特性，使致密的压块在温度以上的非晶合金的软化点和适当的退火应力松弛是有利的。与商业铁粉芯相比，用聚酰亚胺获得的压坯表现出更高的磁导率和更稳定的频率。
Amorphous Co 68.8 Fe 4.2 Si 15 B 12 powders of zero magnetostriction were subjected to warm consolidation with resins for the purpose of AC applications. The amorphous compact of more than 90% of the packing fraction was obtained by consolidation utilizing viscous flow. The magnetic properties of the composite toroidal cores at high frequency range were evaluated by the frequency dependence of the permeability. It was certified that the liquid-state resins were more efficient on the electric isolation of the metallic particles to reduce eddy current losses than the powder resins which occupied the pores within the compact, preferentially. The polyimide varnish was, in particular, advantageous on such thermal resistance and thermosetting characteristics that enabled the denser compact at the temperature above the softening point of the amorphous alloy and the proper annealing for stress relaxation. The compact obtained with polyimide exhibited permeability higher and more stable against frequencies than the commercial iron dust core.