Papers by Author: Jian Feng Gao

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Authors: Jun Pin Lin, Xiang Jun Xu, Jian Feng Gao, Yan Li Wang, Zhi Lin, Guo Liang Chen
Abstract: . A hot working and its effect on the microstructure and tensile properties of Ti-45Al-9 (Nb, W, B, Y) alloy ingot on industrial scale were investigated. The results showed that the alloy has good workability in anα+γphase region. An ingot on industrial scale was successfully extruded followed by multi-step canned forging. The initial microstructure of the alloy is fine full lamellar (FL) microstructure. After hot working a sound pancake exhibiting a fine grain duplex (DP) microstructure with grain size about 20μm was obtained. The as-forged alloy has more balanced tensile properties than the small heats with similar composition and microstructure at both room and high temperatures.
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Authors: Jun Fang Yang, Ji Gui Cheng, Qiu Mei Jiang, Jian Feng Gao
Abstract: Pr1.2Sr0.8NiO4 (PSNO) and Sm0.2Ce0.8O1.9 (SCO) powders were synthesized by a glycine-nitrate process and a gel-casting process, respectively. Pr1.2Sr0.8NiO4-x Sm0.2Ce0.8O1.9 (x=0, 25, 50) composite cathode materials were prepared by mechanically mixing the two powders. The particle size of the synthesized PSNO and SCO powders is about 100nm and 50nm, respectively. PSNO and SCO have a good chemical compatibility. Area specific resistance value for the Pr1.2Sr0.8NiO4-x Sm0.2Ce0.8O1.9 (x=25, 50) composite cathode on SCO electrolyte is 0.087 and 0.076Ωcm2 at 750°C, which indicates Pr1.2Sr0.8NiO4-Sm0.2Ce0.8O1.9 composite materials may be a promising cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC).
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Authors: Wei Tao Bao, Jian Feng Gao, Guang Yao Meng
Abstract: A single cell with a two-layer electrolyte consisting of an yttria stabilized zirconia (YSZ, Y2O3 8 mol%) layer and an Sm-doped ceria (SDC, Sm2O3 20mol%) interlayer has been fabricated on porous YSZ-NiO anode support. The layer of YSZ electrolyte was prepared by modified electrostatic powder coating method and the SDC interlayer by screen-printed method on the green YSZ layer. After co-firing at 1400°C for 5 h, the two-layer film with a dense YSZ film of about 15μm and porous SDC film of about 25μm was fabricated. The performances of as-fabricated single cell using La0.8Sr0.2FeO3 as cathode were tested using H2-3% H2O as fuel and air as oxidant at 800°C. Results indicated that the peak power density of a single cell with SDC interlayer reaches 469 mW/cm2 at 800°C, obviously higher than that of without SDC interlayer, which is about 300 mW/cm2 at 800°C.
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Authors: Wei Tao Bao, Yin Zhu Jiang, Guang Yan Zhu, Jian Feng Gao, Guang Yao Meng
Abstract: Dense YSZ thin film with a thickness from 2 to 15 µm on porous Ni-YSZ anode support was fabricated by a novel powder coating process. The performance of the cell with a composite of Sm0.8Sr0.2CoO3- YSZ (40 wt.%) as cathode was examined over a temperature range from 550 to 800 °C, using H2 -3% H2O as fuel and air as oxidant. The maximum power density of the cells was over 300 mW/cm2 at 800 °C. The open circuit voltage of the cells reached 1.1 V at 750 °C, illustrating the full dense of the YSZ electrolyte. The anode-electrolyte interfacial resistances were negligible in comparison with that of cathode-electrolyte, indicating the good coherency of the YSZ electrolyte to the anode support. These results demonstrate the reliability of this novel process for thin electrolyte SOFCs.
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