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粉末冶金材料科学与工程 >

2022 , Vol. 27 >Issue 3: 327 - 335

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2022002

工艺技术

氧化促进剂对铁粉磷化及铁粉芯软磁性能的影响

  • 刘向阳 ,
  • 傅嘉迁 ,
  • 于永亮 ,
  • 李松林
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  • 1.中南大学 粉末冶金国家重点实验室,长沙 410083;
    2.山东鲁银新材料科技有限公司,莱芜 271105

收稿日期: 2022-01-05

  修回日期: 2022-04-01

  网络出版日期: 2022-04-19

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Effects of oxidation accelerator on phosphating of iron powders and soft magnetic properties of iron powder cores

  • LIU Xiangyang ,
  • FU Jiaqian ,
  • YU Yongliang ,
  • LI Songlin
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  • 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
    2. Shandong Luyin New Material Technology Co., Ltd., Laiwu 271105, China

Received date: 2022-01-05

  Revised date: 2022-04-01

  Online published: 2022-04-19

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摘要

以还原铁粉为基体粉末,探究氧化促进剂Na2MoO4、NaNO2及其复合添加对铁粉在NaH2PO4磷化液中磷化反应的影响,通过扫描电镜、X射线衍射仪、傅里叶红外光谱仪,振动样品磁强计以及软磁交流测量仪对磷化前后的铁粉和铁粉芯进行结构与性能表征。结果表明：铁粉在质量分数为5%的NaH2PO4磷化液中反应速度过快,无法生成完整均匀的包覆层,铁粉芯的软磁损耗虽有降低,但磁导率的频率稳定性不佳,铁粉经NaH2PO4磷化的表面磷化层主要由Fe3(PO4)2、FePO4组成。在NaH2PO4磷化液中添加NaNO2,虽然促进了磷酸盐的生成,但包覆不均匀,其包覆层主要由FePO4组成;在NaH2PO4磷化液中添加Na2MoO4或Na2MoO4+NaNO2复合氧化促进剂可以使铁粉表面生成均匀的包覆层,大幅度降低铁粉芯的涡流损耗,其包覆层主要由FePO4和Fe2(MoO4)3组成。其中Na2MoO4+NaNO2复合添加对磷化反应的改善效果最好,400 ℃热处理后的铁粉芯电阻率为194.2 μΩ·m,在测试励磁场强度Bm=50 mT,测试频率f=100 kHz条件下,铁粉芯的磁导率为92.5,软磁损耗为142.0 W/kg。

关键词： 磷酸盐包覆; 磷酸二氢钠; 氧化促进剂; 铁粉芯; 软磁性能

本文引用格式

刘向阳 , 傅嘉迁 , 于永亮 , 李松林 . 氧化促进剂对铁粉磷化及铁粉芯软磁性能的影响[J]. 粉末冶金材料科学与工程, 2022 , 27(3) : 327 -335 . DOI: 10.19976/j.cnki.43-1448/TF.2022002

Abstract

The effects of oxidation accelerator Na2MoO4, NaNO2 and their compound addition on the phosphating reaction of iron powder in NaH2PO4 phosphating solution were investigated using reduced iron powder as matrix powder. The structure and properties of iron powder before and after phosphating and iron powder cores were characterized by scanning electron microscopy, X-ray diffractometer, Fourier transform infrared spectrometer, vibration sample magnetometer and soft magnetic AC measuring instrument. The results show that iron powder in 5% mass fraction of NaH2PO4 phosphating solution cannot form a complete and uniform coating with the rapid reaction speed. The soft magnetic loss of iron powder cores decreases, but the frequency stability of magnetic permeability is bad. The surface phosphating layer structure of iron powder phosphated by NaH2PO4 is mainly composed of Fe3(PO4)2 and FePO4. The addition of NaNO2 in NaH2PO4 phosphating solution promotes phosphate generation, but the coating isn’t uniform, and the coating layer is mainly composed of FePO4. Adding Na2MoO4 or Na2MoO4+NaNO2 composite oxidation accelerator to NaH2PO4 phosphating solution can generate uniform coating layer on the surface of iron powders and greatly reduce the eddy current loss of iron powder cores. The coating layer is mainly composed of FePO4 and Fe2(MoO4)3. The compound addition of Na2MoO4+NaNO2 compound addition has the best improvement effect on phosphating reaction. After heat treatment at 400 ℃, the resistivity of iron powder cores is 194.2 μΩ∙m, under the condition of Bm=50 mT, f =100 kHz, the magnetic permeability of iron cores is 92.5, and the soft magnetic loss is 142.0 W/kg.

Key words： phosphate coating; sodium dihydrogen phosphate; oxidation accelerator; iron powder cores; soft magnetic properties

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