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Key Problems of Cold Power Spinning of Ti-15-3 Alloy

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Journal of materials Science & Technology 2001年第1期17卷 125-126页

作者： Debin SHAN Yan LU and Ping LI School of materials Science and Engineering, Harbin institute of Thchnology, Harbin 150001, China Yi XU institute of Metal research, Chinese Academy of Sciences, Shenyang 110015, China Harbin inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

The key problems of cold power spinning of Ti-15-3 alloy are studied. Reasonable billet preparation methods are presented to improve crystal structure and avoid crack of billet. Influences of original wall thickness, reduction rate and feed rate on expanding in diameter are analyzed and some methods to prevent expanding in diameter are given.

关键词： Ti Key Problems of Cold Power Spinning of Ti-15-3 Alloy

Wear Properties of Plasma Nitrided H13 Steel at Room and Elevated Temperature

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稀有金属材料与工程 2012年第S1期41卷 203-206页

作者： Zhu Ruihua Tian Linhai Bao Mingdong Yong, Ma Bin, Tang Taiyuan Univ Technol Res Inst Surface Engn Taiyuan 030024 Peoples R China Ningbo Univ Technol Res Inst Mat Sci & Engn Ningbo 315016 Zhejiang Peoples R China

H13 steel was nitrided using a plasma surface alloying technique at the temperature of 570℃.The nitrided layers with different thicknesses and components were obtained by changing nitriding *** microstructure and composition of the nitrided layers were evaluated by optical microscopy(OM)and X-ray diffraction(XRD).The wear properties of the nitrided layer against Al2O3 ball at room temperature using a ball-on-disc tribometer and against Si3N4 ball at elevated temperature using a HT-2001 abrasive wear test machine were *** results show that the nitrided layers are composed of compound layer and diffusion layer at the pressure of 100 and 450 *** obvious compound layer appears at pressure of 200 and 300 *** analysis shows the nitrided layers are mainly composed ofε-Fe2-3N,γ'-Fe4N,α-Fe,Fe2O3 and Fe3O4 *** surface hardness of plasma nitrided H13 steel is about 1100HV0.050 doubled that of *** room temperature friction coefficient of H13 steel is reduced and wear rate is decreased by nitriding at 200 and 300 *** temperature wear test indicates the nitrided H13 steel at the pressure of 100 Pa shows lower friction coefficient and wear rate which are reduced more than 6 times compared with that of H13 substrate.

关键词： plasma nitriding H13 steel elevated temperature wear

Fractal Microstructure of Fracture Surfaces and Fracture Energy of Metals

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Journal of materials Science & Technology 1997年第6期13卷 495-498页

作者： Shi, DW Jiang, J Lung, CW Liu, HZ Lou, TP Liu, HB Chinese Acad Sci Inst Met Res Int Ctr Mat Phys Shenyang 110015 Peoples R China Chinese Acad Sci Inst Met Res State Key Lab RSA Shenyang 110015 Peoples R China

Using a fractal model, we give a new interpretation of the reversed sigmoidal curves of fracture surface profile length obtained in some experiments. It is pointed out that a single parameter (fractal dimension D) is not sufficient to characterize a fractal curve completely. It is shown that the initiator length L-0 is also important to characterize a fractal curve. We have derived a formula which correlate the fracture energy with the fractal parameters of the fracture surfaces and analyzed some experimental data.

关键词： Fracture

Surface Modification of NiW Alloy Substrates

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稀有金属材料与工程 2011年第S3期40卷 380-382页

作者： Wang Xue1, 2, Li Chengshan2, Yu Zeming2, Zheng Huiling2, Ji Yongbin2, Chen Zewen 1, 2, Fan Zhanguo 1 1Northeastern University, Shenyang 110004, China 2Northwest institute for Non-ferrous Metal research, Xi’an 710016, China NW inst Nonferrous Met res Superconducting Mat Res Ctr Xian 710016 Peoples R China Northeastern Univ Shenyang 110004 Peoples R China

We have studied the adsorption of elemental S on the surfaces of NiW alloy substrates where elementary sulfur was used as sulfur source. Compared with those previous investigations which used H2S as the sulfur source and operated in an ultra-high vacuum chamber, we used elemental sulfur as the sulfur source which does not need an ultra-high vacuum chamber but Ar-H protection atmosphere in the process of sulfuration. After sulfuration, epitaxial LZO buffer layers were deposited on these substrates directly. The samples were investigated by means of AFM, XPS, SEM and XRD in this study. The results show that after sulfuration, S forms a c (2×2) structure at a coverage of 0.5 ML, in agreement with previous results, representing the effectiveness of elemental sulfur during the sulfuration process. The c (2×2)-S superstructure on the surface of the NiW substrates has optimized the La2Zr2O7(LZO) buffer layer texture.

关键词： NiW substrates sulfuration c (2×2) structure buffer layer

Kinetics of hydroxylation of phenol with SiC foam supported TS-1 structured catalyst

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第11期18卷 129页

作者： Sun, Yanzhao Lv, Zhitao Zhang, Siyu Wen, Guodong Jiao, Yilai Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China Univ Sci & Technol China Sch Mat Sci & Engn Shenyang 110016 Peoples R China

In light of the challenges associated with catalyst separation and recovery, as well as the low production efficiency resulting from intermittent operation for titanium silicalite-1 (TS-1) catalyzed phenol hydroxylation to dihydroxybenzene in the slurry bed, researchers keep on exploring the use of a continuous fixed bed to replace the slurry bed process in recent years. This study focuses on preparing a TS-1 coated structured catalyst on SiC foam, which exhibits significant process intensification in performance. We investigated the kinetics of this structured catalyst and compared it with those of extruded TS-1 catalyst;the dynamic equations of the two catalysts were obtained. It was observed that both catalysts followed E-R adsorption mechanism model, with an effective internal diffusion factor ratio between structured and extruded TS-1 of approximately 7.71. It was confirmed that the foamed SiC-based structured TS-1 catalyst exhibited significant improvements in phenol hydroxylation in fixed-bed reactor due to its well-developed pore structure, good thermal conductivity, excellent internal mass transfer performance, and short reactant diffusion distance, leading to higher utilization efficiency of active components. This finding also provides a foundation for designing and developing phenol hydroxylation processes in fixed-bed using structured catalysts through computational fluid dynamics calculations.

关键词： titanium silicalite-1 phenol hydroxylation SiC foam structured catalyst coating

Agar coating in multicellular spheroids culture of rat hepatocytes

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Chinese Science Bulletin 1999年第24期44卷 2246-2249页

作者： Shaolin Li Jilun Pan Tao Xu Yaoting Yu Nankai Univ Inst Mol Biol Bioact Mat Res Lab Tianjin 300071 Peoples R China

Aggregation of freshly isolated adult rat hepatocytes in vitro is important for the construction of artificial liver support system. In the experiment, agar has been used as an extracellular matrix substrate and resul... 详细信息

关键词： agar hepatocyte multicellular spheroids.

A Novel Deflection Method for Measuring the Growth Stress of Thermally Growing Oxide Scales

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Journal of materials Science & Technology 2003年第3期19卷 231-234页

作者： Yuhai QIAN MeishuanShenyang National Laboratory for materials Science, institute of Metal research, Chinese Academy of Sciences, Shenyang 110016, China Lab. for mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

A kind of new deflection technique has been developed for measuring the growth stress of thermally growing oxide scales during high temperature oxidation of alloys. The average growth stresses in oxide scales such as Al2O3, NiO and Cr2O3 formed on the surface of the superalloys can be investigated by this technique. Unlike the comventional deflection method, the novel method does not need to apply a coating for preventing one main face of thin strip specimen from oxidizing and can be used under the condition of longer time and higher temperature.

关键词： Oxide film Growth stress Deflection method

First-Principles Study of the Polar TiC/Ti Interface

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Journal of materials Science & Technology 2003年第6期19卷 540-544页

作者： Limin LIU, Shaoqing WANG and Hengqiang YEShenyang National Laboratory for materials Science, institute of Metal research, Chinese Academy of Sciences, Shenyang 110016, China Lab. for mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The interface structure, work of adhesion, and bonding character of the polar TiC/Ti interface have been examined by the first-principles density functional plane-wave pseudopotential calculations. Both Ti- and C-terminated interfaces including six different interface structures were calculated, which present quite different features. For the Ti-terminated interface, the interfacial Ti-Ti bond has a strong metallic and weak covalent character; while for the C-terminated interface, the interfacial bond is a strong polar covalent interaction between the Ti-3d and C-2p orbital. The work of adhesion of C-terminated interface is nearly 9 J/m2 stronger than that of the Ti-terminated. It is found that each termination has relatively large work of adhesion, which is consistent with other polar interfaces.

关键词： First-principles Metal/ceramic interface Adhesion Carbides

Segregation of Liquid Phase in the Extruded Semisolid Metal

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Journal of materials Science & Technology 2003年第3期19卷 209-212页

作者： Zhao YANG,Haifeng ZHANG,Aiming WANG,Bingzhe DING Zhuangqi HU Shenyang National Lab.for materials Science,institute of Metal research,Chinese Academy of Sciences, Shenyang 110016,China Lab. for mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The influence of stress and strain on the solid/liquid segregation formed in deformed semisolid metal was ***compression experiment at a low constant strain rate was conducted on a Gleeble 1500 thermo-mechanical sireulator.The stress and strain fields of the samples were calculated by finite element *** experiment results and themodeling results prove that the hydrostatic pressure gradient is the driving force for solid/liquid ***segregated liquid phase usually agglomerates in the micropores and shear bands are created by sliding of equiaxeddendrite *** sliding among the grains is influenced by the solid fraction and grain size of the semisolid slurry,so as the solid fraction and grain size change,the morphology of the segregated liquid changes.

关键词： Semisolid metal Solid/liquid segregation Hydrostatic pressure Sliding of grains