PVP对有机无机复合绝缘FeSi粉芯力学性能与磁性能的影响  

Effect of PVP addition on mechanical and magnetic properties of organic-inorganic insulated FeSi powder cores

作　　者：李晶晶 张学斌[1,2,3] 刘伟 张华[4] 张博玮 邹中秋[3,4] 苏海林 LI Jingjing;ZHANG Xuebin;LIU Wei;ZHANG Hua;ZHANG Bowei;ZOU Zhongqiu;SU Hailin(School of Materials Science and Engineeringand Anhui Provincial Key Laboratory ofAdvanced Functional Materials and Devices,Hefei University of Technology,Hefei 230009,China;Engineering Research Center of High-Performance Copper Alloy Materials andProcessing,Hefei University of Technology,Hefei 230009,China;Huaian Engineering Research Center of Soft Magnetic Powder Cores and Devices,Jiangsu Red Magnetic Materials Incorporation,Huaian 211700,China;Huaibei Red Magneto-electric Technology Co.,Ltd.,Huaibei 235000,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽省先进功能材料与器件重点实验室,合肥230009 [2]合肥工业大学教育部铜合金及成形加工工程研究中心,合肥230009 [3]江苏瑞德磁性材料股份有限公司淮安市软磁粉芯与器件工程技术研究中心,淮安211700 [4]淮北瑞德磁电科技有限公司,淮北235000

出　　处：《功能材料》2024年第6期6019-6025,共7页Journal of Functional Materials

基　　金：安徽省自然科学基金(2308085QE133);国家电网公司总部科技项目(5500-202118252A-0-0-00);淮安市重点研发计划(HAG202114);宁波市“科技创新2025”重大专项(2020Z062)。

摘　　要：在FeSi粉芯的环氧树脂/SiO_(2)绝缘工艺流程中添加PVP作为增强剂,系统研究了PVP添加量对粉芯生坯强度、成品强度以及磁性能的影响规律。研究发现,PVP的引入可增加绝缘层各组分之间以及绝缘层和磁粉之间的粘结力,进而有利于生坯强度的提高。在退火过程中,适量PVP的熔化还有助于SiO_(2)纳米粒子的均匀重排,从而增强成品强度。同时,适量PVP可促进稳定、均匀SiO_(2)绝缘层的形成,进而实现直流偏置性能的优化以及维持良好的磁导率频率稳定性和较低的磁芯损耗。PVP最佳添加量为0.3%(质量分数),相应的FeSi粉芯生坯强度为22 N,成品强度为305.76 N,有效磁导率在20~2000 kHz具有良好的频率稳定性,8000 A/m直流偏置场下的有效磁导率百分比高达86.5%,50 kHz/100 mT的损耗仅为522.7 kW/m^(3)。PVP with different contents was added to epoxy resin/SiO_(2) insulation procedures as a novel kind of reinforcing agent,and the influences of PVP on green strength,product strength and magnetic properties of FeSi magnetic powder cores were systematically investigated.The results show that PVP in green bodies contributes to the increase of the bonding force between each component of the insulating layer,as well as between the insulating layers and magnetic powders,resulting in an increase in tensile strength.Furthermore,melting PVP during the annealing process with the appropriate content would promote the rearrangement of nano silica,which significantly improves the tensile strength of the annealed products.Similarly,the formation of a stable uniform SiO_(2) insulating layer at a proper dosage of PVP is also conducive to optimizing DC-bias performance,maintaining good frequency stability of permeability and low core loss.The optimal PVP dosage is determined to be 0.3 wt%,and the corresponding FeSi powder core owns a green strength of 22 N,a product strength of 305.76 N,a stable effective permeability at about 60μlevel in the frequency range of 20~2000 kHz,a percent permeability as high as 86.5%at 8000 A/m DC-bias field and a low core loss of 522.7kW/m^(3) at 50 kHz/100 mT.

关 键 词：FESI PVP 软磁粉芯 拉断强度 磁性能 

分 类 号：TM272[一般工业技术—材料科学与工程]