材料科学
陶瓷
复合材料
电介质
热稳定性
复合数
导电体
图层(电子)
脉冲功率
高压
介电强度
光电子学
电压
电气工程
物理
工程类
量子力学
作者
Chunyan Jiang,Yaming Wang,Shuqi Wang,Yufeng Li,Yongchun Zou,Jun Ouyang,Dechang Jia,Yu Zhou
标识
DOI:10.1016/j.surfcoat.2022.128692
摘要
Thermal conductive insulating ceramic materials are urgently needed in the packaging applications for modern electronic devices owing to their multi-functionality. The electrically insulating Al2O3 ceramics with large thickness and high compactness is designed on SiCp/Al baseplate via plasma electrolytic oxidation (PEO) technique, which provides a new idea for the package structure of the IGBT power module. However, porous characteristics of PEO inorganic ceramics hinder effective electrical insulation and heat conduction in practical applications. Herein, the bipolar pulsed (BP) and unipolar pulsed (UP) PEO are tailored to obtain the ceramics respectively. In contrast, the BP mode enables the ceramic layer significantly thickened and densified due to the soft sparking discharge. Combined with outstanding electrical resistivity over 1012 Ω·cm, high breakdown voltage of 716 ± 38 V, high dielectric strength of 15.9 ± 0.8 V/μm, the BP ceramic layer exhibits superior performance in electrical insulation. Moreover, the BP shows excellent thermal cycling stability (>200 cycles), quite good thermal stability, and dielectric stability in the temperature range of 25 °C to 300 °C to realize high-temperature electrical insulation. This work paves a novel way to design and optimize power electronic module package materials and structures.
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