中国电机工程学报2025，Vol.45Issue(19)：7798-7809,中插52,13.DOI:10.13334/j.0258-8013.pcsee.241217
高压大功率IGBT灌封用改性液晶环氧的热-电-力性能
Thermal-electrical-force Properties of Liquid Crystalline Epoxy for High-voltage High-power IGBT Potting Application
摘要
Abstract
As the insulated gate bipolar transistor(IGBT)continues to evolve toward high-power and high-voltage operation,the device is faced with the risk of temperature overheating,breakdown failures,material ruptures,and other failures inside the device.In order to meet the increasingly harsh operating environment of the IGBT,there is an urgent need to develop a high-performance liquid crystalline epoxy potting material.In this paper,a biphenyl-type liquid crystal epoxy 4,4-biphenyldiglycidyl ether(BP)is prepared,and the effect laws of curing temperature and co-mingled bisphenol A epoxy system(EB-BP％)on the electrical insulating properties and thermo-mechanical properties of BP are explored.The results show that BP with sulfonamide(SAA)exhibits a distinct spherical liquid crystalline domain morphology at a curing temperature of 170 ℃(BS-170),and the thermal conductivity(λ.)and breakdown field strength(Eb)of BS-170 are 0.397 W m-1 K-1 and 47.403 kV mm-1,respectively,which are 67.5％and 6％higher than those of bisphenol A epoxy.Theλ of EB-30 in the blended system of BP and bisphenol A epoxy reaches 0.301 W m-1 K-1,which is 28.6％higher than that of bisphenol A epoxy.In addition,EB-30 exhibits excellent tensile strength and elongation at break.Therefore,BP/EB shows better overall performance when used as an IGBT encapsulation material.This study can provide effective ideas and theoretical basis for the development of new high-performance insulating materials for IGBT encapsulation.关键词
液晶环氧/热导率/绝缘特性/热力学性能Key words
liquid crystalline epoxy/thermal conductivity/insulating properties/thermodynamic properties分类
动力与电气工程引用本文复制引用
王争东,刘晨昕,杨淦秋,刘博涛,沈佳仪,成永红..高压大功率IGBT灌封用改性液晶环氧的热-电-力性能[J].中国电机工程学报,2025,45(19):7798-7809,中插52,13.基金项目
国家自然科学基金项目(青年科学基金)(52307028) （青年科学基金）
电力设备电气绝缘国家重点实验室开放课题(EIPE22210) （EIPE22210）
陕西省自然科学基金青年项目(2022JQ-300).Project Supported by National Natural Science Foundation of China(Young Scientistic Program)(52307028) （2022JQ-300）
Open Project of State Key Laboratory of Electrical Insulation of Power Equipment(EIPE22210) （EIPE22210）
Youth Foundation of Science and Technology Department of Shaanxi Province(2022JQ-300). （2022JQ-300）
