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EPMA Study of the Interface of β-Tricalcium Phosphate Ceramies in Vivo

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Journal of materials Science & Technology 2004年第6期20卷 657-661页

作者： Honglian DAI, Xianying CAO, Haichen SHAO, Chunhua SHEN and Shipu LIbiomed.caI materials and eng.neering Center, Wuhan University of Technology, Wuhan 430070, China biomed. Mat. and eng. ctr. Wuhan Univ. of Technol. Wuhan 430070 China

Electr.n probe and X-ray energy spectr.m were used to investigate the chemical composition of the interface between material and new bone after porous tricalcium phosphate ceramie implanted in tibia of rabbits. The element changes of the interface, the materials transformation and the situation of new bone formation at different implantation period were observed. The res.lts showed that the carbon element content decreased gradually in new bone tissue, and the content of calcium and phosphor element increased by degrees with the implantation time. At the same time, calcium-phosphor ratio in the new bone kept a higher Ievel. New bone grew into the materials interior, material dispersed and degraded simultaneously. Both composition of materials and new bone tended to be consentient. Finally, the materials were substituted by new bone. After implantation, not only the materials itself dissolved and degraded partially, but also new bone formed on the outer and pore surface of β-TCP porous bioceramics, which shovved that the degradation products of lifeless calcium phosphate inorganic materials took part in constituting of new bone tissue.

关键词： Calcium phosphate Electr.n probe Interface Chemical composition

THE SYNTHESES OF BENZOFURAN DERIVATIVES

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Journal of Wuhan University of Technology(materials Science) 2000年第4期15卷 33-37页

作者：陈连喜 biomed.cal materials/eng. res. ctr. Wuhan University of Technology Wuhan 430070 China

Two benzofuran derivatives were synthesized from 3,4-bis(trimethylsilyl) furan after a series of reactions. Their structures.were identified by 1H NMR, 13C NMR, MS and EA.

关键词： benzofuran synthesis 3,4-bis(trimethylsilyl)furan

Study on Fine Structure of Gas Atomized LaNi_5-based Alloys

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Journal of materials Science & Technology 2003年第5期19卷 425-427页

作者： Hai JING, Hong GUO, Shuguang ZHANG, Zili MA and Shaoming ZHANGNational eng.neering res.arch Center for Non-ferrous Metals Composites, General res.arch Institute for Non-ferrous Metals, Beijing 100088, China Natl. eng. res. ctr. Res. Inst. of Non-Ferrous Metals Beijing 100088 China

The fine structure of hydrogen storage alloy powders MiNi4.3-xCoxMr0.4AI0.3(x=0.75, 0.45, 0.10; Ml: La-rich misch metal) prepared by rapidly solidifying gas atomization was investigated using a Rietveld analysis method. Two sets of CaCu5-type crystal constants were observed in the studied alloys and one set was larger than the other. With decreasing powder radius the solidification rate of powder increased, and so did the percentage of a particle part with larger crystal constants. The reason why there were two sets of crystal constants might be the difference of solidification rate between the outside and inside of a particle.

关键词： Hydrogen storage alloys Gas atomization Rietveld analysis Crystal structure

Microsegregation and Improved Methods of Squeeze Casting 2024 Aluminium Alloy

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Journal of materials Science & Technology 2003年第5期19卷 413-416页

作者： Yong ZHONG, Guoyue SU and Ke YANGThe National eng.neering res.arch Center, the Institute of Metal res.arch, Chinese Academy of Sciences, Shenyang 110016, China Natl. eng. res. ctr. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The squeeze casting of a 2024 Al alloy was carried out to investigate the effect on microsegregation in the alloy of the application of pres.ure followed by diffusion annealing. The experimental res.lts indicate that an optimum applied pres.ure followed by an optimum diffusion annealing process can markedly reduce the degree of microsegregation and improve the mechanical properties to a degree that can approach the level of forged 2024 Al alloy.

关键词： 2024 Al alloy Squeeze casting Microsegregation Diffusion annealing

Preparation and Characterization of Collagen-GAGs Bioactive Matrices for Tissue eng.neering

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Journal of materials Science & Technology 2001年第5期17卷 495-500页

作者： Hongyi YANG and Qiqing ZHANG Institute of biomed.cal eng.neering, Chinese Academy of Medical Science, Tianjin 300192, China Inst. of biomed. eng. Chinese Acad. of Med. Sci. Tianjin 300192 China

Collagen materials were crosslinked by 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC) in the pres.nce of chondroitin sulfate (CS), one of glycosaminoglycans (GAGS). PVA and chitosan were also blended with collagen. The physical and chemical properties of the matrices were characterized by SEM, DSC, and ESCA. L929 cells were implanted on the matrices to show the cytotoxic and the biological characters of the materials. The res.lts indicate that EDC is an effective and non-cytotoxic cross-link reagent, which can replace the common dialdehyde reagent. The attachment of CS can improve the stability of collagen and accelerate cell growth. The addition of PVA can prepare porous matrices with smaller bore size. There are reactions between the chitosan and collagen, and the composite has good biological character. The pres.nce of chitosan can also increase the amount of incorporated CS.

关键词： Preparation and Characterization of Collagen-GAGs Bioactive Matrices for Tissue eng.neering PVA EDC CS

Strain Softening and Hardening Behavior in AZ61 Magnesium Alloy

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Journal of materials Science & Technology 2004年第6期20卷 691-693页

作者： Haitao ZHOU, Liufa LIU, Qudong WANG, Da LU, Xiaoqin Zeng.and Wenjiang DINGNational eng.neering res.arch Center of Light Alloys Net Forming, School of materials Science and eng.neering, Shanghai Jiao Tong University, Shanghai 200030, China ctr. of Light Alloys Net Forming Sch. of Mat. Sci. and Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

The deformation behavior of AZ61 Mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compres.ion in the temperature range of 523-673 K and at strain rates of 0.001-1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stres. decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features.such as subgrain formation, the criticai stres., the peak stres. and steady stres.. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves.

关键词： AZ61 Mg alloy Recrystallization Strain hardening and softening

The Synthesis and Electr.nic Characteristics of Poly(p-Phenylene Vinylene) Derivatives

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Chinese Chemical Letters 1998年第1期9卷 75-77页

作者： Jian Ying WANG Yin Kui LI Wen Xiang HU Sheng.Jian TAN Yong Fu LONG (The Centre of res.arch and Development of Medicine Pharmaceuticals Commission of Science & Technology and Industry for National Defence. Beijing 100101 materials eng.neering and Appl ctr. R. and D. of Med. Pharmaceut. Commn. Sci./Technol./Indust. N.D. Beijing 100101 China Mat. eng. and Applied Chemistry Natl. Univ. of Defence Technology Changsha 410073 China

A series of soluble poly(p-phenylene vinylene) (PPV) derivatives were synthesized through dehydrochlorination with the p-metaoxy phenol as starting materials. The electr.nic characteristics of PPV derivatives were stu... 详细信息

关键词： poly(p-phenylene vinylene) dehydrochlorination electr.nic characteristic

A Review of Ion Beam Assisted Deposition of Thermal Barrier Coatings

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稀有金属材料与工程 2011年第S4期40卷 215-217页

作者： Liu Liang1,2,Gao Wei2,Zhang Huafang2,Lei Xingen2,Cui Xiangzhong2,Zheng.Yufeng. 1Centre for biomed.cal materials and eng.neering,Harbin eng.neering University,Harbin 150001,China2Science and Technology on Power Beam Processes Laboratory,AVIC Beijing Aeronautical Manufacturing Technology res.arch Institute,Beijing 100024,China Harbin eng. Univ Ctr Biomed Mat & Engn Harbin 150001 Peoples R China AVIC Beijing Aeronaut Mfg Technol res.Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

Ion beam assisted deposition (IBAD) technology has been employed more and more in the fabrication of films and/or coatings,especially in the composite *** the pres.nt work,after the introduction about IBAD,the latest development of IBAD in thermal barrier coatings (TBCs) is briefly summarized and the future trend is also concluded.

关键词： ion beam assisted deposition ion source thermal barrier coatings thermal conductivity

Preparation and properties of CdSiO3:Mn2+,Er3+phosphor

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Preparation and properties of CdSiO3:Mn2+,Er3+phosphor