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Oxidation behaviors of wrought nickel-based superalloys in various high temperature environments

Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1524-1531页

作者： Changheui JANG daejong kim Donghoon kim Injin SAH Woo-Seog RYU Young-sung YOO Korea Advanced Institute of Science and Technology 291 Daehak-roYuseong-guDaejeon305-701Korea Korea Atomic Energy Research Institute 150 Deogjin-dongYuseong-guDaejeon 305-600Korea Korea Electric Power Research Institute 103-16 Munji-dongYuseong-guDaejeon 305-380Korea

Oxidation characteristics of Alloy 617 and Haynes 230 at 900 oC in simulated helium environment,hot steam environment containing H2 as well as in air and pure helium conditions were *** to air condition,the oxidation rate of Alloy 617 was not significantly affected in helium and hot steam environments,while Haynes 230 showed lower oxidation rate in helium *** the other hand,the oxide morphology and structure of Alloy 617 were strongly affected by the environments,but those of Haynes 230 were less dependent on the *** Haynes 230,a Cr2O3 inner layer and a protective MnCr2O4 outer layer were formed in all environments,which contributed to the better oxidation *** the mechanical properties,such as creep and tensile properties,were significantly affected by the oxidation behaviors,surface treatment methods to enhance oxidation resistance of these alloys should be developed.

关键词： oxidation nickel-based superalloys very high temperature reactor (VHTR) impure helium hot steam

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应用于燃料电池的高速单级空气压缩机波箔轴承技术

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风机技术 2021年第4期63卷 43-49页

作者： daejong kim Mechanical and Aerospace Engineering Department University of Texas at ArlingtonArlingtonTXUSA 76019

The motivation to use air foil bearings in fuel cell compressors is driven by the demand for oil-free and high-power density system to reduce system volume and weight. The characteristics of air foil bearings that realize this demand are its independency on auxiliary system and no scheduled maintenance as well as their superb performance at high speeds. However, integration of the foil bearings to the compressor needs rigorous developmental tests for the bearing to withstand high g-load during vehicle maneuver and to remain stable in rotordynamics under external destabilizing forces. This paper presents multi-pads foil bearing technology applicable to single stage high speed fuel cell air *** different multi-pad air foil bearing designs(two-pad vs three-pad) were tested using a high-speed spin test rig to identify the differences in rotordynamics responses. The two-pad bearing is superior in rotordynamics without any sub-synchronous vibration while three-pad bearing provides more uniform load capacity in all directions with less rotordynamics stability. Frequency-domain modal analyses verify the experimental observations. Axial foil bearings with 38 mm outer diameter was designed and tested up to 140 krpm with load capacity of 90 N(1.4 bar specific load capacity).Finally, a platform design of single stage 15 k W fuel cell compressor with rated speed of 130 krpm is proposed using the multi-pad foil bearings and axial foil bearings developed through this paper.

关键词： stability. system rigorous

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