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Processing research.on Shaping Porous 316L stainless steel via SLS

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稀有金属材料与工程 2011年第S3期40卷 206-210页

作者： Yang Lijun 1, Dang xinan1, Zhou Lian 1,2. Chen Qiaofu 1, Wang Lili 1 1Shaanxi University of Science & Technology, xi’an 71002., china 2.1} {2. for nonferrous metal research. xi’an 710016, china Shaanxi Univ Sci & Technol Dept Mechanoelect Engn Xian 710021 Peoples R China nW Inst nonferrous Met Res Xian 710016 Peoples R China

The principles of selective laser sintering (SLS) were applied in this experiment .The influence of laser power, scan distance, scan speed and other processing parameters of fiber laser on the pore properties, elastic modulus, and micro morphology, etc were investigated in this paper. Tests were conducted on 316L stainless steel powder. The results showed that porous metal material that meets the requirements of porous bionic human bone material (porosity of 33.4%-37.8%, average pore radius of 94.2.178 μm, elastic modulus of 7.43-12.76 GPa, nearly spherical regular pore) can be produced when sintered at 90-100 W laser power, with a scan speed of 2.-2. mm/s and scan distance of 0.165 mm.

关键词： selective laser sintering material power processing parameters porosity

Preparation of YBCO Superconducting Film by Chemical Solution Deposition Using a novel Copper Precursor Derived from PEG_(2.0) and Sucrose

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稀有金属材料与工程 2011年第S3期40卷 346-349页

作者： Yan Wuwei1, Zhang Chengxiao1, Zhang Guofang1, Jin Lihua2. Li Chengshan2. Yan Guo2. Lu Yafeng2.1 Shaanxi normal University, xi’an 710062. china 2.northw.st {2. for nonferrous metal research. xi’an 710016, china Shaanxi normal Univ Xian 710062 Peoples R China nW Inst nonferrous Met Res Xian 710016 Peoples R China

Preparation and characterization of the YBCO superconducting films by chemical solution route with polyethylene glycol (PEG2.0) and Cu(nO3)2.as precursors are presented. It was found that PEG2.0 and sucrose were novel chelates and Cu (nO3)2.was an alternative precursor for the preparation of YBCO superconducting film by chemical solution route. The precursor solution was prepared by mixing yttrium trifluoroacetate, barium trifluoroacetate, and copper nitrate in solvent of methanol with chelates including PEG2.0 and sucrose. YBCO films were prepared by coating the precursor solution on LaAlO3 single crystal substrate, following vacuum drying, rapid calcining, firing and oxygen annealing. The prepared films were characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that films were crack-free and homogeneous, stronger tendency of (00l) texture, uniform with less pore, pure c-axis orientation. The films showed good superconducting properties, with Tc of 90 K and critical current density (Jc) of 1 MA/cm2.(77 K, 0 T). This work demonstrates that the developed method is a promising method for preparation of YBCO superconducting film which has a fine superconducting characterization with advantages of simple and rapid.

关键词： coated conductor YBCO chemical solution deposition PEG2.0 copper nitrate sucrose

Effect of HT on the Interface Diffusion and Microstructure of Cu-nb Micro-composites

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稀有金属材料与工程 2011年第S3期40卷 376-379页

作者： Liang Ming, Lu Yafeng, Sun Lufei, Li Chengshan, Yan Guo northw.st institute for {2. metal research. xi’an 710016, china nW Inst nonferrous Met Res Superconducting Mat Res Ctr Xian 710016 Peoples R China

We have fabricated high strength and conductivity Cu-nb micro-composites by bundling and drawing process. The interface diffusion and microstructure of Cu-17vol% nb composites experienced severe plastic deformation at different heat treatment conditions are investigated. Diffusion at Cu/nb interface of nb filaments is observed by scanning electron microscopy and energy dispersive X-ray spectroscopy. The interface characteristic and edge spheroidization of nb filaments are discussed.

关键词： Cu-nb heat treatment microstructure diffusion

Large Ti_3SiC_2.Bulks Fabricated by Infiltration Method

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稀有金属材料与工程 2011年第S3期40卷 372-375页

作者： Shan Di, Yan Guo, Zhou Lian, Li Chengshan, Wang Qingyang, xiong xiaomei northw.st institute for {2. metal research. xi’an 710016, china nW Inst nonferrous Met Res Superconducting Mat Ctr Xian 710016 Peoples R China

T3SiC2.bulks have been synthesized by infiltrating Si liquid into porous precursor pellets composed of solid Ti and C powders. Silicon pellets were placed at the bottom of the precursor pellets as the liquid source. The starting compositions can be represented by the formula 3Ti + 2. + xSi, where x = 1.0, 1.2. 1.4 and 1.6, respectively. The phase formation and microstructure of the bulks were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results demonstrated that the Ti/C precursor pellet could only react with Si completely when the x value is 1.6. Large, a purity of above 95wt% Ti3SiC2.bulk of up to 50 mm in diameter was obtained by this method.

关键词： infiltration method Ti3SiC2 bulks Si content 50 mm in diameter

Impact factors of fractal analysis of porous structure

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Science china(Technological Sciences) 2010年第2期53卷 348-351页

作者： TAnG HuiPing, ZHU JiLei, xi ZhengPing, DI xiaoBo, WAnG JianYong & AO QingBo state Key Laboratory of Porous metal Materials, northw.st {2. for nonferrous metal research. xi’an 710016, china state Key Laboratory of Porous metal Materials Northwest Institute for Nonferrous Metal Research Xi’an China

Characterization of pore structure is one of the key problems for fabrication and application research.on porous materials. But, complexity of pore structure makes it difficult to characterize pore structure by Euclidean geometry and traditional experimental methods. Fractal theory has been proved effective to characterize the complex pore structure. The box dimension method based on fractal theory was applied to characterizing the pore structure of fiber porous materials by analyzing the electronic scanning microscope (SEM) images of the porous materials in this paper. The influences of image resolution, threshold value, and image magnification on fractal analysis were investigated. The results indicate that such factors greatly affect fractal analysis process and results. The appropriate magnification threshold and fractal analysis are necessary for fractal analysis.

关键词： porous materials fractal dimension porous structure

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国内钛合金近几年学术研究进展

钛工业进展 2003年第4期20卷 35-40页

作者：赵永庆西北有色金属研究院西安710016

在钛合金研发受到高度重视的同时,相关钛合金的基础研究国内也较重视,取得了较好的成绩,如发展的近β锻造技术、准β锻造技术、三态组织、阻燃机理、低温变形机理、原子与空位的交互作用等等。本文综述了国内钛合金近几年的学术研究进展。

关键词：钛合金基础研究近β锻造准β锻造三态组织阻燃机理低温变形研究进展

Mechanism of Burn Resistance of Alloy Ti40

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Journal of Materials Science & Technology 2001年第6期17卷 677-678页

作者： Yongqing ZHAO, Lian ZHOU,Kanging ZHU,Henglei QU and Huan WU northw.st institute for {2. metal research. xi’an 710016, china [Manuscript received June 5, 2.00] Inst. for nonferrous metal Res. Xi'an 710016 China

The Ti fire found in high performance engines promotes the development of burn resistant Ti alloys. The burn resistant mechanism of Ti40 alloy is investigated. Ti40 alloy reveals good burn resistance. Its interfacial products between burning products and the matrix are tenacious, which retard the diffusion of oxygen into the matrix. Two burn resistant mechanisms, that is, fast scatter dispersion of heat and suppression of oxygen diffusion, are proposed.

关键词： Ti Mechanism of Burn Resistance of Alloy Ti40

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球磨WC-Co纳米复合粉末的合成和成形

稀有金属与硬质合金 2003年第1期31卷 53-56页

作者：宁阳西北有色金属研究院陕西西安710016

介绍了在室温下利用高能量球磨方法合成WC-Co纳米复合粉末的情况,并对粉末的性能进行了讨论。

关键词：纳米复合材料机构合金化球磨成形

Transition Temperature of Bi_2.r_2.aCu_2._(8+x) Superconducting Films Prepared from Commercial Precursors

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稀有金属材料与工程 2011年第S3期40卷 368-371页

作者： Bi Yue1, Wang Sansheng1, Hao Qingbin2.1 Inertial technology Key Laboratory of Fundamental Science for national Defense, Beihang University, Beijing 100191, china 2.northw.st {2. for nonferrous metal research. xi,an 710016, china Beihang Univ Sch Instrument Sci & Optoelect Engn Inertial Technol Key Lab Fundamental Sci Natl Def Beijing 100191 Peoples R China nW Inst nonferrous Met Res Xian 710016 Peoples R China

This paper have made a systematic study of the superconducting Bi-2.12.phase transition temperature, which has a transition temperature (Tc) around 80-93 K, and depends on precise control of synthesis conditions, mainly including heat treatment parameters, oxygen partial pressure, and annealing temperature. Partial melting of the sample during preparation helps to raise its Tc. To elucidate the origin of this strong effect, the samples were heated with different melting process. The rapid changes in Tc value are associated with small changes in oxygen content, which depends on the annealing temperature and the oxygen partial pressure. We have optimized the above mentioned parameters for Bi-2.12.film, and Tconset was improved to 93 K.

关键词： Bi-2.12 phase partial melt process transition temperature