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Preparation, Properties and Characterization of Modified CeO_2/La_2Zr_2O_7 Buffer Layers

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稀有金属材料与工程 2011年第S3期40卷 350-353页

作者： Cheng Yanling, Suo Hongli, Liu Min, Ma Lin, Zhang Teng key laboratory of advanced Functional materials, ministry of education, beijing university of Technology, beijing 100124, china beijing Univ Technol Coll Mat Sci & Engn Minist Educ Key Lab Adv Funct Mat Beijing 100124 Peoples R China

The metal organic deposition (MOD) method was used for the epitaxial growth of the CeO2/La2Zr2O7(LZO)/LZO seed layer structure on a cube-textured Ni5W substrate layer by layer. The material phase and the macro-orientations were analyzed by XRD. The surface morphology and the blocking performance of the buffer layer were investigated by SEM and AES. The grain orientation and the crystallographic growth mode of the CeO2 layer were first characterized by electron backscattering diffraction (EBSD). The uniformly distributed islanded LZO seed layer optimized both the in-plan and the out-plan orientation of the CeO2/LZO buffer layers, and the CeO2/LZO buffer layers with a thickness of 175 nm acted as an efficient Ni,W barrier. The EBSD analysis indicated that the crystallographic orientation of each layer can be obtained at various accelerating voltages for the multilayer sample, the percentage of {001} rotated cube texture of CeO2 layer reaching 97.4% at the accelerating voltage of 15 kV, thus showing epitaxial deposition with a high texture.

关键词： coated conductor buffer layer La2Zr2O7 seed layer CeO2 rotated cube texture accelerating voltage

Inter-phase selective corrosion of γ-TiAl alloy in molten salt environment at high temperature

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Progress in Natural science:materials International 2011年第4期21卷 322-329页

作者： Wen-yue ZHAO,Bo-wen XU,Yue MA,Sheng-kai GONG key laboratory of Aerospace materials and Performance(ministry of education), School of materials science and engineering,Beihang university,beijing 100191,china key laboratory of Aerospace materials and Performance (ministry of education) School of Materials Science and Engineering Beihang University Beijing 100191 China

Hot corrosion behavior of Ti-48Al-2Cr-2Nb alloy in molten salt environment of 75%Na2SO4and 25%NaCl(mass fraction) at 800℃was studied using oxidation kinetics analysis,scanning electron microscopy,X-ray energy dispersive and X-ray diffraction *** inter-phase selective corrosion,which caused the corrosion pits initiated from lamellar interfaces and the preferential corrosion ofα2phases,was observed during the hot corrosion of the *** common controls of thermodynamic and kinetics in corrosion reactions with fluxing and active oxidation process were considered the essential hot corrosion mechanisms of the ***,lamellar refinement was proved to be an effective way to mitigate the inter-phase selective corrosion of the alloy in molten salts.

关键词： hot corrosion TiAl-based alloy inter-phase selective corrosion molten salts

Influence of flux treatment on the glass forming ability of Pd-Si binary alloys

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International Journal of Minerals,Metallurgy and materials 2007年第S1期15卷 4-7页

作者： Na Chen, Kefu Yao, and Fang Ruan key laboratory for advanced materials Processing Technology, ministry of education, department of Mechanical engineering, tsinghua university, beijing 100084, china.

Pd81Si19 amorphous alloys were prepared by combination methods of melt spinning and B2O3 flux treatment. A compari- son between the ribbons prepared from the fluxed ingots and the non-fluxed ones has been carried out. The result reveals that after fluxing treatment the glass transition temperature of the as-prepared glassy ribbons is reduced while the initial crystallization tem- perature is enhanced. It results in that the supercooled liquid region (defined as the difference between the initial crystallization tem- perature and the glass transition temperature) of the glassy alloy treated with fluxing technology has been increased from 31 to 42 K. This shows that fluxing technique can enhance the glass forming ability (GFA) of the binary alloy and improve the thermal stability of supercooled liquid of the glassy alloy.

关键词： amorphous alloys flux treatment glass forming ability supercooled liquid region

Influence of sample surface condition on nano indentation experiment

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Rare Metals 2002年第2期21卷 131-132页

作者： WANG Yanli, LIN Zhi, LIN Junpin, PENG Jihua, and CHEN GuoliangState key laboratory for advanced Metals and materials, university of science and Technology beijing, beijing 100083, china university of science and Technology beijing State Key Laboratory for Advanced Metals and Materials 北京 100083

The microhardness and elastic modules of the materials weremeasured using the Nano Indenter II, which is a new measuring systemfor the mechanical properties of materials on nano-scale. It candetermine themicrohardness, elastic modules and other mechanicalproperties of materials through measuring applied load and depthunder indenter tip. The results indicated that surface condition ofsample such as the surface roughness affects the experimental preci-sion.

关键词： microhardness elastic modules Nano Indenter

Effect of Carbon on Dynamic Recrystallization Behavior of Vanadium Microalloy Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 129-134页

作者： LIU Guo-quan 1,2,ZHAO Hai-tao 1,WU Jin-bin 1,WANG Cheng-yang 1,XU Lei 1,3 (1.School of materials science and engineering,university of science and Technology beijing,beijing 100083,china 2.State key laboratory for advanced Metals and materials,university of science and Technology beijing,beijing 100083,china 3.department of materials science and engineering,tsinghua university,beijing 100084,china) Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Univ Sci & Technol beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China tsinghua Univ Dept Mat Sci & Engn Beijing 100084 Peoples R China

The hot working behavior especially dynamic recrystallization of low-carbon and medium-carbon vanadium microalloy steels has been studied by performing isothermally compression tests and Avrami *** Avrami plots of the two experiment steels have been constructed based on flow stress curves following a new approach (Jonas,et *** Mater.,2009,57(2):2748-2756;Wu et al,Acta ***.,2010,46(7):838-843).It is experimentally found that the carbon effect on dynamic recrystallization is opposite to each other in lower and higher strain ranges:Carbon causes a softening effect at low strain rates (0.01,0.1,and 1.0 s-1),and a hardening effect at high strain rates (10.0 and 30.0 s-1).Correspondingly,carbon promotes the dynamic recrystallization at low strain rates and retards the dynamic recrystallization at high strain rates in the experimental *** phenomenon is then tentatively explained based on the possible mechanisms of dynamic process at different strain rates.

关键词： vanadium microalloy steels hot working dynamic recrystallization carbon strain rate Avrami modeling

Cloning and characterization of 37 kDa laminin receptor precursor in pearl oyster,Pinctada fucata

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Progress in Natural science:materials International 2008年第2期18卷 233-238页

作者： Yaopeng Fu a,Liping Xie a,b,,Rongqing Zhang a,b,a Institute of Marine Biotechnology,department of Biological sciences and Biotechnology,tsinghua university,beijing 100084,china b Protein science laboratory of the ministry of education,tsinghua university,beijing 100084,china Institute of Marine Biotechnology Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China Protein science laboratory of the ministry of education Tsinghua University Beijing 100084 China

A 1063 bp cDNA clone encoding a putative 37 kDa laminin receptor precursor (37 kDa LRP) is isolated from the mantle tissue of pearl oyster,Pinctada fucata. The amino acid sequence predicted from the cDNA sequence is 301 residues long,with a calculated molec-ular mass of 33.5 kDa. RT-PCR analysis shows that 37 kDa LRP mRNA is especially highly expressed in the mantle while widely expressed in several tissues. In situ hybridization analysis reveals that 37 kDa LRP is expressed in the outer epithelial cells of the mantle edge,suggesting its involvement in cell proliferation and secretion in P. fucata. The identification and characterization of 37 kDa LRP in the pearl oyster will help us to further understand the signal transduction in the processes of mantle epithelial cell proliferation and tissue formation.

关键词： 37 kDa laminin receptor precursor Mantle epithelial cell Pearl oyster

Molecular cloning and characterization of a cotton phosphoenolpyruvate carboxylase gene

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Progress in Natural science:materials International 2008年第5期18卷 539-545页

作者： Zhixin Qiao, Jin-Yuan Liu laboratory of Molecular Biology and Protein science laboratory of the ministry of education, department of Biological sciences and Biotechnology, tsinghua university, beijing 100084, china laboratory of Molecular Biology and Protein science laboratory of the ministry of education Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China

Phosphoenolpyruvate carboxylase (PEPC) plays diverse physiological functions during plant development. In this study, a new phos- phoenolpyruvate carboxylase gene GhPEPC2 is isolated from cotton (Gossypium hirsutum cv. zhongmian 35) by RACE-PCR. The cloned cDNA of GhPEPC2 is 3364 bp in length, and has an open reading frame of 2913 bp, encoding for 971 putative amino acids with a calculated molecular mass of 110.6 kD and pI of 5.56. The deduced amino acid sequence of GhPEPC2 shares high similarity with other reported plant PEPCs. Southern blot analysis indicates that the cotton PEPC exists as a small gene family and the GhPEPC2 might have two copies in the cotton genome. The semi-quantitative RT-PCR reveals that GhPEPC2 constitutively expresses in all the tissues of cot- ton and accumulated highly in roots, owers and embryos but relatively low in stems and bers. In addition, the recombinant GhPEPC2 has been puri ed by expressing it in Escherichia coli and the catalytic properties of it were also investigated. The results showed that GhPEPC2 is a typical C3 PEPC with a higher Km (83.6 lM) and lower Vmax (8.0 lmol min 1 mg 1) compared with the C3 PEPCs pre- viously reported.

关键词： Phosphoenolpyruvate carboxylase Recombinant protein Southern blot Cotton

Effect of Compounding of Sodium Tripolyphosphate and Super Plasticizers on the Hydration of α-calcium Sulfate Hemihydrate

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Journal of Wuhan university of Technology(materials science) 2011年第4期26卷 737-744页

作者：潘伟 key laboratory of advanced materials of ministry of education Tongji University

The inhibition and its mechanism of sodium tripolyphosphate （STP） composited with super plasticizers （SPs） on hydration of α-calcium sulfate hemihydrate were studied by setting time, strength, hydration heat, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, electronic probe micro analysis （EPMA）, scanning electron microscopy （SEM） and differential scanning calorimeter （DSC） measurements. The experimental results show that compared with STP addition, compositing STP with polycarboxylate （PC） plasticizer, the final setting time is prolonged from 0.5h to 2hs. While formulating STP with naphthalene-based plasticizer （NAP） or sulfonate melamine formaldehyde plasticizer （SMF）, the final setting time is reduced to quarter of an hour. Similar changes can also be found in the rate of exothermic hydration and hydration degree. Formulating STP with suitable addition of PC can enhance the strength, while compositing STP and NAP or SMF weakens the strength. Besides, adding STP or STP and SMF, obvious movement （more than 1ev） of binding energy of Ca2p1/2 and Ca2p3/2 is detected. Compared with STP addition, content of the characteristic element （P） of STP is cut down form 1.1% to 0.49% by compositing STP with SMF. Furthermore, as hydration age increases, hydration inhibition in the presence of admixtures weakens and even disappears within 56 h.

关键词： α-calcium sulfate hemihydrate hydration sodium tripolyphosphate plasticizer adsorption

Antibodies induced by multi-epitope vaccine showed inhibitory activity against heterologous influenza A virus (H3N2)

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Progress in Natural science:materials International 2006年第1期16卷 105-108页

作者： DING Jian, WU Fan, WEI Wei and CHEN Yinghua (laboratory of Molecular Immunology, department of Biology, tsinghua university Protein science laboratory of the ministry of education, beijing 100084, china) [a]laboratory of Molecular Immunology Department of Biology Tsinghua University Protein science laboratory of ministry of education Beijing China

In this study, recognition of 4 recombinant viral proteins (GST-NHA1) by the antibodies induced by multi-epitope vaccine was testified. Inhibitory activities of these antibodies were also investigated in vitro against four heterologous influenza A viruses (H3N2). Three epitope-specific antibodies purified by affinity chromatography could reduce the plaque formation. Interestingly, the three neutralizing antibodies in combination showed obvious enhancement of inhibitory activity, suggesting that the development of recombinant multi-epitope vaccine might be an effective way against viral mutation.

关键词： influenza A virus recombinant multi-epitope vaccine neutralizing antibody plaque reduction assay.