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Your search keyword '"Zhao, Longjie"' showing total 13 results
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13 results on '"Zhao, Longjie"'

10. Low Switch Loss and High Current Density Superjunction IGBT Based upon Deep Trench Technology

Author

Lu Yi, Li Hao, Pan Jia, Xing Junjun, Zhang Xukun, Zhao Longjie, Huang Xuan, Weiran Kong, Yang Jiye, and Chen Chong

Subjects
010302 applied physics, Materials science, business.industry, Chip size, 020208 electrical & electronic engineering, Deep trench, 02 engineering and technology, Insulated-gate bipolar transistor, 01 natural sciences, Power (physics), 0103 physical sciences, Limit (music), 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, business, Current density, High current density
Abstract

In this paper we present a Superjunction IGBT (Super-IGBT) based upon Deep Trench (DT) Superjunciton technology to cope with high current density, smaller chip size and low switch losses. The current density of Super-IGBT is 550A/cm2(CP test:20A@1.8V), almost close to Si-IGBT limit. Moreover, under the same switch condition, Super-IGBT show 54% lower turn-on loss, 15% lower turn-off loss and 60% chip size shrink compared with the 650V FS-IGBT. Super-IGBT is favorable for high power and high frequency applications.

Published
2019

13. Fabrication of Co-Based Coatings on Titanium Alloy by Laser Cladding with CeO 2 Addition.

Author

Weng, Fei, Yu, Huijun, Chen, Chuanzhong, Liu, Jianli, Zhao, Longjie, and Dai, Jingjie

Subjects
TITANIUM alloys, SURFACE coatings, MICROSTRUCTURE, MICROHARDNESS, WEAR resistance
Abstract

In this study, Co-based laser cladding coatings reinforced by multiple phases were fabricated on titanium alloy. Co42 Co-based self-fluxing alloy, B4C, and CeO2mixed powders were used as the precursor materials. The coatings were mainly composed of γ-Co/Ni, CoTi2, CoTi, NiTi, TiC, Cr7C3, TiB2, and TiB phases. A typical TiB2/Cr7C3/TiC composite structure was chosen. It was found that CeO2did not influence the phase types of the coating significantly, but was effective in refining the microstructure and enhancing the microhardness and dry sliding wear resistance. Compared with the Ti-6Al-4V titanium alloy, the microhardness and wear resistance of the composite coatings were enhanced by 3.44–4.21 times and 14.26–16.87 times, respectively. [ABSTRACT FROM PUBLISHER]

Published
2016
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