Zr对钕铁硼磁体性能稳定性的影响

Effect of Zr on High Properties Consistency of NdFeB Magnets

摘要:

规模化制备高性能烧结钕铁硼材料对磁体磁性能稳定性提出了很高的要求。研究了Zr和Nb添加对磁体性能稳定性的影响。结果表明：Zr添加含量增加到0.07%，磁体的烧结温度可高达1110 ℃，晶粒不发生异常长大，矫顽力达到1021 kA/m左右，Nb的添加提高了磁体的方形度。当Nb和Zr复合添加时，制备的磁体磁性能高，性能稳定性好，最大磁能积为403.8±4.7 kJ/m3，这主要是由于Zr的添加极大地降低了磁体对烧结温度的敏感性

Abstract:

Producing on scale for sintered NdFeB magnets demands consistency of magnets. The effect of element Zr and Nb on consistency of magnets was investigated. It was found that as Zr content increased from 0 to 0.07at%, the sinter temperature of magnet could reach to 1110 ℃ with no abnormal grain growth, and coercivity increased to 1021 kA/m. And Nb addition was benefit for squareness improvement. Combined addition of Nb 0.07at% and Zr 0.07at%, the magnets showed much better properties consistency even at different positions in same furnace and the energy densities reached 403.8±4.7 kJ/m3. It was attributed that the sensitization of sinter temperature of magnets was greatly removed by Zr and Nb addition