检索结果-内蒙古大学图书馆

Laser Cladding of fluoridated hydroxyapatite coatings on Titanium alloy for bone replacement structures

2013 International Conference on Material Science and Engineering, ICMSE 2013

作者： Huang, An-Guo Liu, Yuan Hu, Shu-Hui Wang, Qing-Hua Zhen, Li-Ling State Key Laboratory of Material Forming and Mould and Die Designing Huazhong University of Science and Technology Wuhan 430074 China Key Lab of Shenzhen Information Functional Ceramics Shenzhen 518118 China Huazhong University of Science and Technology Wuhan 430074 China Dongfeng Peugeot Citroen Automobile Company Ltd 165# ShenLong Road Wuhan Hubei China Ningbo branch of china academy of ordance science Zhejiang Ningbo 315103 China

ISBN: (纸本)9783037858707

Bone-like fluoridated hydroxyapatite (FHA) coatings were prepared on Ti-6Al-4V substrates (TC4) by using laser cladding. This bioceramic coating was fabricated by adding CaF2 micron-particles into the hydroxyapatite before presetted on the Ti alloy substrate and radiated by laser beam which aimed at obtaining lower solubility, fine thermostability and maintaining the comparable bioactivity and biocompatibility. Coatings, which were processed using a Nd:YAG laser cladding, presented FHA crystallization on the surface with a uniform morphology along the coating cross-section and no significant dilution of the titanium alloy was observed. Phase analysis by X-ray diffraction indicated the generation of fluoridated hydroxyapatite phase in the laser cladded coatings. The coatings showed the formation of a metallurgically sound and diffused substrate-coating interface, which significantly increased bonding strength between the coatings and subtrate. The bioactive coatings afforded favourable bone bioactivity by inducing the rapid precipitation of apatite on their surface when immersed in a simulated body fluid (SBF). The work demonstrated the potential of using laser cladding for fabricating fluoridated hydroxyapatite bioceramic coatings on Ti alloy. © (2013) Trans Tech Publications, Switzerland.

关键词： Laser cladding

来源：评论

学校读者我要写书评

暂无评论

The Optimization Design Study of Selective Laser Sintering Process Parameters on the Pro-Coated Sand Mold

The Optimization Design Study of Selective Laser Sintering P...

引用

The International Conference on Recent Trends in materials and Mechanical Engineering (ICRTMME 2011)

作者： Rong Cheng Xiaoyu Wu Jianping Zheng College of Mechatronics and Control Engineering Shenzhen University State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology School of Material Science and EngineeringHuazhong University of Science and Technology

This paper presents experimental investigations on influence of important process parameters viz.,laser power,scan speed,layer thickness,hatching space along with their interactions on dimensional accuracy of Selective Laser Sintering(SLS) processed pro-coated sand *** is observed that dimensional error is dominant along length and width direction of built *** parameters setting to minimize percentage change in length and width of standard test specimen have been found out using Taguchi's parameter *** process conditions are obtained by analysis of variance(ANOVA) is used to understand the significance of process variables affecting dimension *** speed and hatching space are found to be most significant process variables influencing the dimension accuracy in length and *** laser power and layer thickness are less influence on the dimension *** optimum processing parameters are attained in this paper: laser power 11 W;scan speed 1200 mm/s;layer thickness 0.5 mm and hatching space 0.25 *** has been shown that,on average,the dimensional accuracy under this processing parameters combination could be improved by approximately up to 25% compared to other processing parameters combinations.

关键词： Selective Laser Sintering(SLS) casting sand mould dimension accuracy Taguchi method

来源：评论

学校读者我要写书评

暂无评论

Microstructure and shear strength of the brazed joint of Ti(C,N)-based cermet to steel

引用

Rare Metals 2010年第1期29卷 72-77页

作者： YE Dameng, XIONG Weihao, Zhang Xiuhai, QU Jun, and YAO Zhenghua state key laboratory of Plastic forming simulation and die & mould technology, Huazhong University of Science and technology, Wuhan 430074, China State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science and Technology

Firm joins were obtained between Ti（C,N）-based cermet and steel with Ag-Cu-Zn-Ni filler metal by vacuum brazing. The effects of technological parameters such as brazing temperature, holding time, and filler thickness on the shear strength of the joints were investigated. The microstructure of welded area and the reaction products of the filler metal were examined by scanning electron microscopy （SEM）, metallographic microscope （OM）, energy-dispersive X-ray analysis （EDS）, and X-ray diffraction （XRD）. The brazing temperature of 870℃, holding time of 15 min, and filler thickness of 0.4 mm are a set of optimum technological parameters, under which the maximum shear strength of the joints, 176.5 MPa, is achieved. The results of microstructure show that the wettability of the filler metal on Ti（C,N）-based cermet and steel is well. A mutual solution layer and a diffusion layer exist between the welding base materials and the filler metal.

关键词： Ti（C,N）-based cermet vacuum brazing filler metal shear strength interface structure

来源：评论

学校读者我要写书评

暂无评论

The Properties of an UV Curable Support Material Pre-polymer for Three Dimensional Printing

引用

Journal of Wuhan University of technology(materials Science) 2010年第2期25卷 278-281页

作者：黄兵莫健华 State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science & Technology

An ultraviolet（UV） curable support material pre-polymer for three dimensional printing was prepared based on the synergistic effect between PEO-PPO-PEO tri-block copolymer（F127） and polyethylene glycol （400） di-acrylate（SR344）. The effects of jetting conditions, thermal stability, curing time, mechanical properties and shrinking rate on printing models were studied. The situation of removing support material from build model was investigated after building progress was completed. The experimental result shows that when F127 is 6.0wt%, SR344 is 20.0wt%, 4-Methoxy phenol is 0.15wt% and Irgacure 2959 is 1.5wt%, the support material pre-polymer could be jetted out from the nozzles smoothly during building up of three dimensional printing models at 50-55 ℃. In addition, the support material could be removed easily from building model without spoiling the model; furthermore, the forming precision of building model is improved.

关键词： three dimensional printing support material synergistic effect forming precision

来源：评论

学校读者我要写书评

暂无评论

Synthesis and photo-responsive behaviors of hollow polyazobenzene micro-spheres

引用

Chinese Science Bulletin 2010年第30期55卷 3441-3447页

作者： WANG XiaoTao YANG YingKui YANG ZhiFang LIAO YongGui ZHANG Wei XIE XiaoLin State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Faculty of Materials Science and Engineering Hubei University Wuhan 430062 China

By means of distillation precipitation polymerization,the silica-hybrid particles with polyazobenzene shell (PAzo@SiO2) microspheres were prepared with 6-(4-methoxy-4'-oxy-azobenzene) hexyl methacrylate (Azo-M) as monomer,divinylbenzene (DVB) as cross-linker,and ～250 nm vinylated sol-gel silica particles as template. Hollow polyazobenzene microspheres were further developed after selective removal of the silica cores with HF solution. When the content of DVB related to Azo-M is 20 wt%,the acetonitrile is 200 mL,and the polymerization time is 4.5 h,the hollow PAzo microspheres with about 20 nm shell are successfully fabricated. These hollow PAzo microspheres have excellent reversible photoisomerization,and their first-order rate constant of trans-cis isomerization only decreases 11.8% compared with homopolymer of azobenzene (Homo-PAzo).

关键词：空心微球光响应甲基丙烯酸甲酯行为合成二乙烯基苯顺反异构化偶氮苯

来源：评论

学校读者我要写书评

暂无评论

Automatic intelligent casting process design coupled numerical simulation with artificial intelligence

Automatic intelligent casting process design coupled numeric...

引用

69th World Foundry Congress 2010, WFC 2010

作者： Chen, Liliang Zhou, Jianxin Liao, Dunming Hao, Jing Shen, Xu Wei, Pengcheng State Key Lab of Materials Process and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781622762866

The goal of the research focuses on automatic intelligent casting process design technology. Namely, satisfied casting process scheme will be designed automatically without any manual acting completely. In this paper, a new framework is set up coupled numerical simulation(CAE) with artificial intelligence (AI) to realize the goal. In detail, casting process is optimized by artificial intelligence and evaluated by numerical simulation respectively. Some key techniques are developed such as automatic simulation, quantitative casting defect prediction, artificial intelligent optimization, automatic 3D geometry modeling, data transfer between CAE and CAD and so on. Among them, quantitative casting defect prediction and artificial intelligent optimization are the footstones. Accurate quantitative casting defect prediction provides the precondition for the optimization, and reliable optimization ensures the performance of casting process design. Therefore, quantitative shrinkage defect is predicted based on dynamic feeding analysis technology, air entrapment and slag inclusion are forecasted quantitatively by multi-phase fluid field simulation technology. Finally, as a testing object, the riser system of a simple steel casting is designed by the technology automatically. The casting is poured and the result proves the new technology can be used to optimize the foundry process with high efficiency. It also shows the bright future of the new technology.

关键词： Computer aided design

来源：评论

学校读者我要写书评

暂无评论

RETRACTED ARTICLE: forming analysis of aluminium alloy workpiece

RETRACTED ARTICLE: Forming analysis of aluminium alloy workp...

引用

作者： Ning, Deng Xia, Ju-Chen Wang, Xin-Yun Hu, Guo-An State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical and Materials Engineering Jiujiang University jiujiang 332005 China

The influencing factors on the workpiece quality of aluminium alloy sheet forming, such as material properties, forming condition, stress status and lubrication types were concluded. And how to improve the performance... 详细信息

ISBN: (纸本)9781424463503

关键词： Engineering

来源：评论

学校读者我要写书评

暂无评论

Influence of friction and lubrication on the formability of aluminium alloy plate

Influence of friction and lubrication on the formability of ...

引用

2010 International Conference on Mechanic Automation and Control Engineering, MACE2010

作者： Deng, Ning Xia, Ju-Chen Wang, Xin-Yun Hu, Guo-An State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology wuhan 430074 China School of Mechanical and Materials Engineering Jiujiang University Jiujiang332005 China

Analyzed the friction mechanism and lubrication characteristics during the aluminium alloy forming process. Influence of it on the workpiece quality of aluminium alloy sheet forming was concluded. And how to improve t... 详细信息

ISBN: (纸本)9781424477388

关键词： Friction

来源：评论

学校读者我要写书评

暂无评论

Notice of Retraction: forming analysis of aluminium alloy workpiece

Notice of Retraction: Forming analysis of aluminium alloy wo...

引用

International Conference on Computer Engineering and technology, ICCET

作者： ning Deng ju-chen Xia xin-yun Wang guo-an Hu School of mechanical and materials engineering jiujiang university 332005China State key lab of material processing and die and mould technology huazhong university of science and technology wuhan China State key Laboratory of material processing and die Mould Technology Huazhong University of Science and Technology Wuhan China School of mechanical and materials engineering jiujiang university jiujiang China

This article has been retracted by the publisher.

关键词：

来源：评论

学校读者我要写书评

暂无评论

New method of improving parts accuracy by adding heat balance support in selective laser sintering

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 361-369页

作者： Bing LIU Li-chao ZHANG Jian-hua MO Bo QIAN State Key Laboratory of Plastic Forming Simulation and Die and Mould Technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

In order to improve parts accuracy, a method of adding heat balance support （HBS） was proposed, and the detailed algorithm for generating HBS was developed. A number of experiments and a comparison between similar softwares, showed that the algorithm is efficient and feasible. Moreover, different features of riBS were studied for different kinds of materials, such as PS and nylon. The research findings indicate that automatically adding HBS can significantly improve the accuracy of the parts, and that the algorithm for generating HBS is efficient and precise.

关键词： Selective laser sintering （SLS） Accuracy Heat balance support （HBS） Triangular facet 3D rings

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：