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oxidation properties of Silver Alloy Powders and Microstructures of Oxidized Powders for Making Electrical Contact Composites

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Journal of Rare Earths 1998年第2期16卷 37-41页

作者：周继扣马福康刘茂林 Gen Res Inst NonFerrous Met Beijing 100088 Peoples R China

The oxidation properties of silver alloy powders and microstructures of oxidized powders have been investigated by thermo gravity analysis(TGA), scanning electron microscopy(SEM) and wave dispersive X ray spectroscopy(WDEX). Ag Sn RE alloy powders have been oxidized completely at 610 ℃ within 60 min, with an external pure silver scale forming around each oxidized particle. It is useful to produce electrical contact composites. The excellent oxidation properties of Ag Sn RE alloy powders are attributed to the ideal microstructure of the oxidized powders.

关键词： Rare earths Electrical contact composites oxidation properties Microstructure of oxidized powders

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High temperature oxidation properties of Al-Cu-Si alloys for latent heat energy storage

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Energy and Built Environment 2023年第3期4卷 308-314页

作者： Junwen Zhao Yan Shi Yanping Yuan Xingmin Huang Jing Han School of Materials Science and Engineering Key Lab of Advanced Technologies of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

The effect of Cu content on the high temperature oxidation properties of the phase change material(PCM)Al-Cu-Si alloys was *** oxidation kinetics curves at 600◦C were achieved for Al-Cu-Si alloys with 35-55%Cu,which all follow the cubic *** an increase in the Cu content from 35 to 55%,the weight gain decreases from 5.75 to 3×10^(−4) g/cm^(2) after 96 h isothermal *** oxidation rate also decreases with Cu content,the maximum and minimum rates are 1.52 and 0.32×10^(−5) g/cm^(2)•h,a nearly 4 times *** does not change the phase composition of Al-Cu-Si alloys,but coarsens the *** latent heat and the starting temperature of phase change after 96 h oxidation at 600◦C have variations of less than 10%and 6◦C,respectively,indicating that the Al-Cu-Si alloys have good thermal stability after high temperature oxidation.

关键词： Al-Cu-Si alloy PCMs oxidation properties Thermal stability

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Effect of C/SiC Volume Ratios on Mechanical and oxidation Behaviors of C_(f)/C-SiC Composites Fabricated by Chemical Vapor Infiltration Technique

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 801-811页

作者： Jinjin Yao Shengyang Pang Yuanhong Wang Chenglong Hu Rida Zhao Jian Li Sufang Tang Hui-Ming Cheng Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China The 31St Research Institute of China Aerospace Science and Industry Corp Beijing100074China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055China

C/SiC volume ratios in carbon fiber-reinforced carbon-silicon carbide(C_(f)/C-SiC)composites may influence greatly mechanical and oxidation properties of the composites,but have not been well investigated ***,C_(f)/C-SiC composites with different C/SiC volume ratios were fabricated by chemical vapor infiltration(CVI)technique through alternating the thickness of a pyrocarbon(PyC)*** composites with C/SiC volume ratios of 0.37 and 0.84 exhibited the better comprehensive mechanical *** CS0.37 showed the highest flexural strength of 340.6 MPa,and CS0.84 had the maximum tensile strength of 139.1 *** excellent mechanical properties were closely related to the relatively low C/SiC volume ratios and porosities,optimum interfacial bonding and reduced matrix *** composite with a low C/SiC volume ratio of 0.10 showed the best anti-oxidation performance due to its high SiC *** oxidation mechanisms at 1100℃and 1400℃were discussed by considering the effect of the C/SiC volume ratios,pores and matrix micro-cracks,oxidation of carbon phase and SiC.

关键词： C_(f)/C-SiC composites Chemical vapor infiltration Mechanical properties oxidation properties

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Enhanced oxidation and overheating resistance of the extruded Mg–Zn–Al–Mn magnesium alloy by Calcium addition

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Journal of Magnesium and Alloys 2023年第4期11卷 1276-1291页

作者： Hanieh Yeganeh Ahmad Bahmani Mehrab Lotfpour Mehdi Malekan Masoud Emamy Behzad Nayebi Kwang Seon Shin School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Department of Advanced Materials and Renewable Energies Iranian Research Organization for Science and TechnologyTehranIran Department of Mechanical Engineering University of NevadaRenoRenoNV 89557USA Advanced Research and Technology of Magnesium(ARTofMag)Co. TehranIran Research Institute of Advanced Materials School of Materials Science and EngineeringSeoul National UniversityGwanak-guSeoul 08826Republic of Korea

The effects of Ca addition on the microstructure and oxidation properties of a new Mg alloy were *** oxidation behavior of the alloys was analyzed by thermal analysis and material characterization of the alloys exposed in flame environment;and both electrical and induction ***,the surface layers were characterized using field emission scanning electron microscopy,and X-ray diffraction *** was found that increasing the Ca addition reduces the grain size and increases the fraction of the secondary phases,and enhances the mechanical ***,increasing the Ca contents resulted in the formation of a dense CaO/MgO layer on the surface prohibited the oxygen diffusion and assisted in protection of the substrate against further ***,ignition temperature was increased from 680℃ to 890℃ after addition of the Ca *** mechanical properties and ignition behavior of the current materials was compared with the literature which it showed an excellent combination of the properties in the developed alloys.

关键词： Mg alloys oxidation properties Ca addition Microstructure Intermetallic phases

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