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Numerical calculation on temperature field of FGH95 alloy droplet during rapid solidification

Journal of university of science and technology beijing 2003年第3期10卷 51-54页

作者： huanming chen and benfu hu materials science and engineering school, university of science and technology beijing, beijing 100083,china Physics and Electrical Information engineering school, Ningxia university, Yinchuan 750021,china Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Ningxia Univ Phys & Elect Informat Engn Sch Yinchuan 750021 Peoples R China

The temperature field of FGH95 alloy droplet atomized by plasma rotatingelectrode processing (PREP) during solidification has been calculated through numerical analysisbased on equivalent sensible heat capacity method. And thus the relational curves among temperaturegradient of solid-liquid interface, moving velocity of solid-liquid interface and solid fractionduring solidification have been presented. The results indicate that the relation between averagetemperature gradient of solid-liquid interface and droplet size, and the relation between averagemoving velocity of solid-liquid interface and droplet size can be expressed during solidification.

关键词： FGH95 alloy droplet temperature field numerical calculation

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Surface characteristics of rapidly solidified nickel-based superalloy pow-ders prepared by PREP

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Rare Metals 2003年第4期22卷 309-314页

作者： chen huanming , hu benfu , and LI huiying1) school of materials science and engineering, university of science and technology beijing, beijing 100083, china2) school of Physics and Electrical Information engineering, Ningxia university, Yinchuan 750021, china school of materials science and engineering University of Science and Technology Beijing 北京 100083

The surface microstructure and the surface segregation of FGH 95 nickel-basedsuperalloy powders prepared through plasma rotating electrode processing (PREP) have beeninvestigated by using SEM and AES. The results indicate that the surface microstructure of powderschanges from dendrite into cellular stricture as the particle size of powders decrease, and thepredominant precipitates solidified on the particle surfaces were identified as MC' type carbidesenriched with Nb and Ti. It was also indicated that along with the depth of particle surfaces, thesegregation layer of S, C and O elements are thick, and that of Ti, Cr elements are thin for largesire powders while they are in reverse for median size particles.

关键词： FGH 95 nickel-based superalloy powders surface characteristics microstructure plasma rotating electrode processing

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Large specific surface area S-doped Fe–N–C electrocatalysts derived from Metal–Organic frameworks for oxygen reduction reaction

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Progress in Natural science:materials International 2020年第6期30卷 896-904页

作者： Xiaohui Yan Xiaolin Li Cehuang Fu chen Lin huanming hu Shuiyun Shen Guanghua Wei Junliang Zhang Institute of Fuel Cells School of Mechanical Engineering Shanghai Jiao Tong University Central Research Institute Shanghai Electric Group SJTU-Paris Tech Elite Institute of technology Shanghai Jiao Tong University MOE Key Laboratory of Power Machinery and engineering Shanghai Jiao Tong University

It is highly desired but challenging to develop platinum group metal-free electrocatalysts for oxygen reduction reaction(ORR), which can promote the commercialization of fuel cell technology. To achieve this target, we report a one-step doping method to prepare S-doped Fe–N–C catalysts using zeolite imidazole framework(ZIF-8)and iron(III) thiocyanate(Fe(SCN)3) as precursor. Different from conventional doping approach, i.e. physical mixing, Fe(SCN)3is in-situ added during ZIF-8 formation which would encapsulate Fe(SCN)3molecules inside ZIF-8 to avoid structure destruction and create potential replacement of Zn ions by Fe ions to form uniform Fe–N4 complexes. As a result, the prepared S-doped Fe–N–C catalysts own large specific surface areas with a maximum value of 1326 m2g-1and a dual-scale porous structure that benefits mass transport. Significantly, the composition-optimized catalyst exhibits superior ORR activity in both 0.1 M HCl O4electrolyte and 0.1 M KOH electrolyte, in which the half-wave potential reaches 0.81 V and 0.92 V(vs. RHE), respectively. Remarkable stability is also attained, which loses 2 m V only after 10000 potential cycles in O2-saturated 0.1 M HCl O4and remains almost constant in O2-saturated 0.1 M KOH, surpassing commercial Pt/C catalyst in both acidic and alkaline medium.

关键词： Fuel cells Oxygen reduction reaction Non-precious metal catalyst Co-doping Acidic and alkaline medium

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