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| 一体成型电感中聚酰亚胺改性树脂性能研究 |
| Properties of polyimide-modified resin in molded inductors |
| 投稿时间：2024-03-14 修订日期：2024-04-07 |
| DOI： |
| 中文关键词: 软磁复合材料 一体成型电感 有机包覆 聚酰亚胺 |
| 英文关键词: Soft magnetic composites Molded inductors Organic coating Polyimide |
| 基金项目:广东风华高新科技股份有限公司车规级一体成型电感用关键材料及制造技术项目（风华-2024-0064）；中央高校基本科研业务费(DUT21LAB135). |
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| 中文摘要: |
| 传统热固性树脂耐温性能较差限制了一体成型电感在高温工况下的应用。本工作使用聚酰亚胺改性环氧树脂作为有机包覆材料制备了三组磁粉芯材料，以及一组环氧树脂包覆磁粉芯作为对照实验。结果表明，聚酰亚胺改性环氧树脂显示出了良好的包覆均匀性，显著提高了羰基铁粉的耐高温氧化性能。与环氧树脂相比，聚酰亚胺改性环氧树脂具有与铁粉更接近的线膨胀系数，玻璃化转变温度可达177℃，采用3 wt.%聚酰亚胺改性环氧树脂制备的磁环径向断裂强度高达398N，在240℃条件下仍能保持50 GΩ以上电阻，三次265℃高温回流焊后材料内部结构稳定，感值仅降低2.7%。 |
| 英文摘要: |
| The poor temperature resistance of traditional thermosetting resins limits the application of moldeded inductors in high temperature conditions. In this work, three groups of magnetic powder core materials were prepared by polyimide modified epoxy resin, and one group of epoxy resin coated magnetic powder core was used as control experiment. The results shows that the polyimide modified epoxy resin showed good coating uniformity, and the high temperature oxidation resistance of carbonyl iron powder was significantly improved. Compared with the epoxy resin, the polyimide-modified epoxy resin has a linear expansion coefficient closer to that of the iron powder, and the glass transition temperature is up to 177 ℃. The radial breaking strength of the magnetic ring prepared by 3 wt.% polyimide-modified epoxy resin is as high as 398 N, and the resistance is still above 50 GΩ at 240 ℃. After reflow welding at 265℃ for three times, the internal structure of the material is stable, and the inductance value is only reduced by 2.7%. |
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