粉末冶金法制备稀土超磁致伸缩材料的研究

Preparation of Giant Magnetostrictive Sintered Compacts by Powder Metallurgy

介绍了一种粉末冶金制备稀土磁致伸缩材料的方法,该方法包括铸造Tb0.30Dy0.70Fe1.80合金锭、制粉、磁场取向、压制成型和烧结工序。实验结果表明:粒度小于0.147 mm的Tb0.30Dy0.70Fe1.80合金粉末,经磁场取向后压制成型,在1200℃烧结2 h,并在950℃热处理24 h,当磁场强度为240 kA.m-1,预应力为8 MPa时,材料的磁致伸缩系数达到1.613×10-3。

Powder metallurgy technique was applied to prepare rare earth giant magnetostrictive materials. This preparation process consists of cast Tb0.30 Dy0.70 Fe1.80 alloy, which is pulverized by ball mill, aligned in magnetic field, compacted and sintered in inertial atmosphere. The experimental results indicate that when the magnetic field is 240 kA·m^-1, the sample with particle size less than 0. 147 mm being compacted in magnetic field exhibits 1.613 × 10^-3 magnetostriction under a compressive pre-stress 8.0 MPa after being sintered at 1200℃ for 2 h and annealed at 950℃ for 24 h.