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Chinese Journal of Aeronautics 2023年第5期36卷 534-548页

作者： Jiang YU Xinglin MIAO Hongtao ZHANG Bo WANG changming qu Peng HE State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Institute for Shipwelding Technology Shandong Institute of Shipbuilding TechnologyWeihai 264209China

The dissimilar materials joining of C/C composites to T2 copper were performed successfully by thermo-compensated Resistance Brazing Welding(RBW)with AgCuTi filler *** interfacial microstructure,phase composition,and shear strength of the resistance brazed joints were investigated by the relevant analysis *** results indicated that the order affecting the shear strength of the C/C-Cu joint was welding current,welding pressure,and welding time in *** shear strength of backward thermo-compensated RBW was higher than that of forward thermo-compensated RBW due to the Peltier *** maximum shear strength of the C/C-Cu joint was 11.56 MPa in the optimized welding parameter with welding current of 8.0 kA,welding time of 60 ms,and welding pressure of 0.10 MPa by backward thermo-compensated *** interface structure at the resistance brazed joint with this welding parameter was C/C composites/TiC/Cu(s.s)/T2 *** TiC phase was verified at the interface of the brazed joint by Scanning Electron Microscope(SEM),Energy-Dispersive X-ray Spectrometer(EDS),and X-ray Diffraction(XRD).Considerable fractures occurred in the C/C composites and partial fracture occurred at the interfacial reaction layer.

关键词： AgCuTi C/C composites Copper Resistance Brazing welding Shear strength

EFFECT OF HOMOGENIZATION PROCESSING ON MICROSTRUCTURE AND PROPERTIES OF Ti-34Al-2Mn ALLOY

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中国有色金属学会会刊：英文版 1993年第4期3卷 50-55页

作者： Lei,changming qu,Xuanhui Huang,Baiyun Xiong,Xiang Powder Metallurgy Research Institute,Central South University of Technology,Changsha 410083,China

A γ-TiAl base alloy with the composition of Ti-34Al-2Mn（wt--%）was prepared by consum-able electrode arc-melting *** effect of homogenization processing following arc-melt-ing on its microstructure and mechanical properties was *** emphases were placedon the microstructural evolution during solidification and homogenization,and the relationship be-tween microstructure and *** has been determined that the samples annealed at 900℃for 20 h exhibit the best ductility compared with those treated at other temperatures up to 1100℃,and they have a mixed structure of equiaxed grain of γ-TiAl single phase and some prima-ry lamellar grains which include three types of interfaces,i.e.,α2/γ,/γ/γS,γ/γT,maintainingspecific orientaion relationships between both *** ductility improvement is believed to be as-sociated with existence of suitable amount of α2-Ti3Al phase and the refinement of grains ob-tained at 900℃.

关键词： Ti-34Al-2Mn Alloy homogenization microstructure properties

Grain Refiner for TiAl Intermetallic Compounds

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Journal of Materials Science & Technology 1994年第3期10卷 205-208页

作者： Yuehui HE Yexiang LIU Baiyun HUANG Xuanhui qu and changming LEI (Powder Metallurgy Research Institute, Central South University of Technology, Changsha, 410083, China) Central South Univ of Technology Changsha China

The effect of BN addition on the grain size and rnechanical properties of Ti-34.1 wt-%Al alloy was investigated. It has been found that BN is an effective grain refiner for TiAl base alloys, The addition of a small arnount of BN to TiAl can change the coarse columnar grains of as-cast rnicrostructure into the fine equiaxed grains. It has been also determined that Ti-34.1 wt-%Al-1.0 wt-%BN alloy has better mechanical properties and microstructure

关键词： TiAl AIME

Application of the Long-Chain Linear Polyester in Plastification of PVC

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Journal of Wuhan University of Technology(Materials Science) 2008年第1期23卷 100-104页

作者：李岩 School of Materials Science and Engineering Tongji University

The plastification modification of poly （vinyl chloride）（PVC） with the long-chain linear polyester （LP） synthesized by linear dodecanedioic acid （DC12） or tetradecanedioic acid （DC14） with different diols is investigated. The processing characteristics, mechanical properties and extraction property of the PVC/LP blends in different solvents （xylene, cyclohexane, ethanol） were also studied in detail. All results were compared with that of the PVC plasticized with dioctyl phthalate （DOP）. The results show that the molecular weight, molecular structure and loading of LP greatly influence the mechanical properties of the PVC/LP blends. The processability and the mechanical properties of PVC plasticized by LP are comparable to those of the corresponding PVC/DOP blends. However, the PVC/LP blends posses much better migration resistance property than the corresponding PVC/DOP blends, which makes the long-chain linear polyester become a very good plasticizer candidate for PVC industry.

关键词： poly (vinyl chloride) long-chain linear polyester DOP plasticizer migration resistance

地震加速度变化对阀门鉴定的影响分析及应对方案

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核动力工程 2016年第6期37卷 62-65页

作者：张卫曲昌明中国核电工程有限公司北京100840

核电厂设计中阀门的抗震要求普遍选用包络地震加速度值。由于厂址或设计要求的变化,可能导致核电厂的包络地震加速度提高,将会对已有样机鉴定的覆盖性产生影响。结合国内外工程实践及法规、标准的要求,分析确定在不同情况下供货商所需... 详细信息

核电厂设计中阀门的抗震要求普遍选用包络地震加速度值。由于厂址或设计要求的变化,可能导致核电厂的包络地震加速度提高,将会对已有样机鉴定的覆盖性产生影响。结合国内外工程实践及法规、标准的要求,分析确定在不同情况下供货商所需进行相关分析或试验的原则性要求。结合法规中给出的原则要求,给出了阀门抗震鉴定过程中不同试验方法下对应的输入参数要求。

关键词：阀门地震加速度鉴定抗震试验