酚醛粘结TbDyFe稀土磁致伸缩材料研究

Study on phenolic bonded TbDyFe magnetostrictive materials

采用取向织构合金粉开展了粘结稀土超磁致伸缩粘结工艺与性能研究。实验结果表明,对材料磁致伸缩影响显著的因素为粉末粒径和成形压力,在400 MPa压力下成形,粒径为250~420μm的粉末压制的样品拥有最大的磁致伸缩,无预应力时饱和磁致伸缩系数λs最大值为870×10^-6。16~20 KHz的磁场中,对材料损耗影响最大的因素为压制压力,压制压力高于400 MPa后材料的损耗降低至较低水平。

The preparation and measurement of the magnetoelastic properties of bonded oriented alloy powder are reported.The experimental results show that the magnetostriction of material is significantly affected by the particle size and compaction pressure,samples with the particle size around 250-420μm and the compaction pressure of 400 MPa has the largest magnetostriction 870×10^-6 without prestressing.By 16-20 KHz magnetic field,the most remarkable factor of material loss is the compaction pressure,the material loss decreases to a lower level when the compaction pressure is higher than 400 MPa.