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restrain coarsening of the prior austenite grain through pitting austenite grain boundary. The precipitate of (Nb,Ti)C and nanometer size precipitate of NbC can be an effective barrier for dislocation... grain; dislocation; nanometer sized precipitate; CO2 corrosion; pitting corrosion rate 套管是开采石油天然气必须使用的工程用具.随着西部大开发的深入,采油条件越来越恶劣,深井,超深井的开发量加大,对石油套管的性能提出更高要求[1].CO2驱油技术大量应用于深井,超深井的开发,CO2腐蚀给石油天然气工业造成巨大损失......
RESEARCH AND DEVELOPMENT OF HIGH TEMPERATURE STRUCTURAL MATERIALS FOR AERO-ENGINE APPLICATIONS G.Q.Zhang1 (1.Beijing Institute of Aeronautical Materials (BIAM), Beijing 100095, China) Abstract:The status of research, development of superalloys and materials processing & fabrication technologies for aero-engine applications in China Aviation Industry, with an emphasis on recent achievements......
Study on Alfalfa Yield Improved by New Rare Earth Materials for Agriculture Abudukahar1,WANG Jiachen2,Peng Jianzhang3,Cui Yingguo4,Fan Tianwen1 (1.Grassland Working Station of Yili, Yining 835000..., Urumqi 830000, China) Abstract:New rare earth(RE) materials for agriculture including RE entire nutrition agent, amino acid chelated RE fertilizer, RE phosphate were used to alfalfa production......
the diffuse of W atom in matrix phase and prevents W crystal from growing up. The three layer microstructure model image of W particle inner alloy was established. Key words: 90W-7Ni-3Fe alloy; nanometer... of tungsten based heavy alloys[J]. Refractory Metals and Hard Materials, 1989, 8(1): 236-243. [10]Bose A, German R M. Sintering atmosphere effects on tensile properties of heavy alloys[J]. Metall Trans......
Influence of Lanthanum on Synthesizing of SiC Nanometer Powder张宁,龙海波,王柳燕,才庆魁摘 要:Low cost silicon carbon nanometer powder was synthesized by carbothermal reduction method with nanometer SiO2 and carbon as raw material. Its synthesis thermodynamics were discussed. The influence of La on TG-DSC curve was also analyzed. It indicated that the synthesis......
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Preparation, characterization and photocatalytic properties of nanometer zinc ferriteXiaojun Guo, Youli Qi, Xien Li, Shengyin Li, Wu Yang, and Jinzhang GaoChemistry and Chemical Engineering College... Microscopy). These results showed that the range of particle size of ZnFe2O4 is about 15-25 nm. Photocatalytic activities of nanometer ZnFe2O4 were also evaluated by degradation of the curcumin solution......
composites ZHENG Wei, YU Hong-ming, CAO Gao-shao, ZHAO Xin-bing (Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China) Abstract: LiFePO4/C composites were synthesized by one-step solid-state reaction using FePO4 and Li2CO3 as raw materials and polypropylene as reductive agent and carbon source. The effect of synthesis temperature on the electrochemical......
