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Bonded Terfenol-D composites with low eddy current loss and high magnetostriction

Rare Metals 2010年第6期29卷 579-582页

作者： tian jianjun,zuo zhijun,pan de’an,{3.,university of science and technology Beijing,Beijing 100083.china school of materials science and {3. University of Science and Technology Beijing Beijing China

Bonded Terfenol-D composites,with high electrical resistivity and low eddy current loss,can be used in an alternating magnetic field with high ***,the nonmagnetic binder impairs the magnetostriction of the *** achieve high magnetostriction and low eddy current loss,the mixture of the alloy powder and binder was compressed at low pressure in an oriented magnetic *** this,the aligned samples were recompressed by cold isostatic pressing（CIP）.Besides,the effect of particle size on the magnetostriction of the bonded Terfenol-D composites was also *** results showed that the bonded Terfenol-D composites had excellent magnetostriction when the particle size was 50-80 μ*** oriented magnetic field and CIP could improve the magnetostriction of the bonded composites,which reaches 1020×*** bonded Terfenol-D composites had good compact structure and high density（7.24 g/cm3..The magnetic loss of the bonded Terfenol-D composites was 192 mW/cm3.at a frequency of 100 kHz in a magnetic field of 960 A/m,which was about one third of that of casting Terfenol-D alloys.

关键词： composites Terfenol-D magnetostriction eddy current losses density

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Effects of oxygen and carbon on the magnetic properties and microstructure of Sm_2Co_(17) permanent magnets

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Rare Metals 2007年第4期26卷 299-304页

作者： tian jianjun zhang shengen QU Xuanhui school of materials science and {3. University of Science and Technology Beijing Beijing 100083 China

The research on the sintered Sm2Co17 permanent magnets prepared by metal injection molding is still at the exploratory stage. Carbon and oxygen are two key factors that influence the magnetic properties. In this article, the effects of oxygen and carbon on the properties and microstructure of the magnets have been studied. The results indicate that oxygen consumes the effective Sm content of the magnets and forms Sm2O3.the non-magnetism phase, which result in the deterioration of the magnetic properties. Besides, the magnetic properties decrease in evidence with increasing carbon content. The main factor that affects the magnetic properties is the deterioration of the microstructure of the magnets. The Sm（Co, Cu）5 phase decreases, whereas the cell size increases with the increase of the carbon content. When the carbon content is above 0.43.wt.%, the Sm（Co, Cu）5 phase is not enough to form a uniform cellular microstructure. Thus the magnetic properties disappear. ZrC is detected in the magnets by XRD when the carbon content is above 0.21 wt.%. ZrC also reduces the properties of the magnets.

关键词： permanent magnets oxygen carbon magnetic properties microstructure

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