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The multi-scale flow behaviors of sisal fiber reinforced composites during resin transfer molding process

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Science China(Technological Sciences) 2018年第12期61卷 1925-1934页

作者： YIN Tao LI Yan YUAN BingYan School of Aerospace Engineering and Applied Mechanical Tongji University Key Laboratory of Advanced Civil Engineering Materials Ministry of Education Tongji University

The flow behaviors of the resin during the resin transfer molding(RTM) process of sisal fiber reinforced composites was studied at different scales with the consideration of the unique hierarchical and lumen structures of sisal fibers compared to those of manmade fibers. The work mainly focused on the development of the multi-scale flow models which include the resin flow inside lumens, intra-bundles and inter-bundles. The models not only quantified the lumen flow based on the Hagen-Poiseuille equation,but also ensured the continuity of the velocity and stress on the boundaries between intra-bundle and inter-bundle regions by applying Brinkman equation. Three dedicated experiments were designed and implemented to validate the effectiveness of the proposed models. The absorbed resin mass over the infiltration time obtained from the single sisal fiber and sisal fiber bundle infiltration experiments showed good agreement with the calculated curves. In terms of the RTM process, the dynamic flow front of the resin was perfectly predicted by the proposed model at macro-scale.

关键词： sisal lumen structure resin transfer molding multi-scale flow

Rheological properties of feedstocks for powder extrusion molding

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中国有色金属学会会刊：英文版 2000年第5期10卷 639-641页

作者：周继承黄伯云吴恩熙 Cent S Univ Powder Met Res Inst State Key Lab Powder Met Changsha 410083 Peoples R China

The rheological behaviors of feedstocks for powder extrusion molding, in the temperature range of 40～80 ℃ and the Newton shear rate of 3～800 s -1 , were studied. The effects of feedstock constitution, shear rate and temperature on apparent viscosity, shear stress and active energy were investigated. The viscose flow active energy of PEM feedstocks is 15.89～90.77 kJ/mol. Based on this research, the PEM technical parameters have optimized. [

关键词： powder extrusion molding feedstock rheological property apparent viscosity

NUMERICAL SIMULATION OF FEEDSTOCK MELT FILLING IN A CYLINDRICAL CAVITY WITH SOLIDIFICATION IN POWDER INJECTION molding

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中国有色金属学会会刊：英文版 1998年第4期8卷 13-18页

作者： Qu Xuanhui, Li Yimin, Yue Hongsheng, Mao Jinying, Zhu Lei and Huang Baiyun State Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China State Key Laboratory for Poiuder Metallurgy Central South University of Technology Changsha 410083 China

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关键词： powder injection molding numerical simulation solidification

A strategy to obtain a high-density and high-strength zirconia ceramic via ceramic injection molding by the modification of oleic acid

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 718-725页

作者： Jia-xin Wen Tian-bin Zhu Zhi-peng Xie Wen-bin Cao Wei Liu School of Materials Science and Engineering University of Science and Technology Beijing Sate Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University School of Electromechanical Engineering Guangdong University of Technology

Despite its unique high efficiency and good environmental compatibility, the water-soluble binder system still encounters problems achieving a desired sintered part via ceramic injection molding because of the poor compatibility and the powder-binder segregation between ceramic powders and binders. The objective of this study was to obtain a sintered part with excellent properties by introducing a small quantity of oleic acid to the surface of zirconia powders before the mixing process. As opposed to many previous investigations that focused only on the rheological behavior and modification mechanism, the sintering behavior and densification process were systematically investigated in this study. With the modified powders, debound parts with a more homogeneous and smaller pore size distribution were fabricated. Also, a higher density and greater flexural strength were achieved in the sintered parts fabricated using the modified powders.

关键词： ceramic materials zirconia injection molding oleic acid sintering

molding of Molecular Sieve Residues and Their Application in Cleaning Oily Wastewater

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Transactions of Tianjin University 2019年第6期25卷 631-640页

作者： Zilu Jin Yuqing Zhang Song Wei Shuai Sun School of Chemical Engineering and Technology Tianjin University

To deeply clean oily wastewater,molecular sieve residues(MSRs)were sufficiently recycled and utilized due to their high specific surface area,porous structure,and outstanding adsorption *** MSRs(MMSRs)were prepared by adding additives(starch,citric acid,and soluble glass)to MSRs and were then filled into a fixed bed for adsorbing and separating the oil in *** dodecylbenzenesulfonate was used to modify the MMSRs,and their adsorption property was also *** addition,the MSRs were characterized by scanning electron microscopy,energy-dispersive X-ray spectroscopy,Brunauer–Emmett–Teller analysis,and Fourier transform infrared *** results indicated that MMSRs satisfied the filling requirement of fixed bed,and their dynamic adsorption capacity could reach 0.1854 mg g^?***,the static adsorption capacity of MMSRs achieved 1.7346 mg g^?1 in the optimum conditions,and the oil adsorption performance of modified MMSRs was further ***,this work suggests that MSRs are promising alternatives in cleaning oily wastewater.

关键词： Molecular sieve residues molding Oily wastewater Adsorption Cleaning

Development of wax-oil-polyethylene binder for Fe-2Ni powder injection molding

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中国有色金属学会会刊：英文版 2000年第4期10卷 473-476页

作者：李松林黄伯云李益民曲选辉 Cent S Univ Technol State Key Lab Powder Met Changsha 410083 Peoples R China

A new wax oil polyethylene binder was developed for Fe 2Ni powder injection molding. The advantages of both wax based and oil based binders were acquired. Moreover, the debinding solvent could be recycled. The miscibility of the binder ingredients and the characteristics were evaluated. The results show that the maximum powder loading can reach 60%(volume fraction), and the two direction debinding rate is over 2 mm/h. The drying time for 6.37 mm thick samples is less than 20 min. The recycle ratio of the debinding solvent is over 95%.

关键词： metal injection molding binders solvents

Injection molding of nano structured 90W-7Ni-3Fe alloy powder prepared by high energy ball milling

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中国有色金属学会会刊：英文版 2000年第6期10卷 794-797页

作者：范景莲曲选辉黄伯云 Cent S Univ State Key Lab Powder Met Changsha 410083 Peoples R China

Blended elemental 90W 7Ni 3Fe (mass fraction, %) powder was mechanically alloyed in a planetary ball mill. Nano crystalline grains were obtained after 10 h milling. The nano structured powder was processed to full density by metal injection molding approach. Compacts from the optimal powder binder mixture were studied for molding and sintering behaviors. Milling significantly increases the maximum powder loading and homogeneity of the feedstock, and enhances the sintering densification process. When solid state sintered at 1 350～1 450 ℃, the alloy shows very fine grains (～3 μm), high tensile strength (>1 130 MPa) and almost no distortion. [

关键词： tungsten heavy alloy nano structured powder injection molding

Interfacial microstructure and mechanical properties of Ti-6Al-4V/Al7050 joints fabricated using the insert molding method

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1412-1423页

作者： Hong-xiang Li Xin-yu Nie Zan-bing He Kang-ning Zhao Qiang Du Ji-shan Zhang Lin-zhong Zhuang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China SINTEF Materials and Chemistry Pb.124 BlindernNO-0314 OsloNorway IJmuiden Technology Centre Tata Steel Research&Development1970 CA IJmuidenThe Netherlands

Ti-6Al-4V/Al7050 joints were fabricated by a method of insert molding and corresponding interfacial microstructure and mechanical properties were investigated. The interfacial thickness was sensitive to holding temperature during the first stage, and a good metallurgical bonding interface with a thickness of about 90 μm can be obtained at 750°C. X-ray diffraction, transmission electron microscopy, and thermodynamic analyses showed that the interface mainly contained intermetallic compound TiAl_3 and Al matrix. The joints featured good mechanical properties, i.e., shear strength of 154 MPa, tensile strength of 215 MPa, and compressive strength of 283 MPa, which are superior to those of joints fabricated by other methods. Coherent boundaries between Al/TiAl_3 and TiAl_3/Ti were confirmed to contribute to outstanding interfacial mechanical properties and also explained constant fracture occurrence in the Al matrix. Follow-up studies should focus on improving mechanical properties of the Al matrix by deformation and heat treatment.

关键词： interfacial microstructure interfacial bonding mechanism mechanical properties insert molding method coherent boundaries Ti/Al joints

RHEOLOGICAL PROPERTIES OF METAL INVECTION molding BINDER AND FEEDSTOCK

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中国有色金属学会会刊：英文版 1997年第3期7卷 104-108页

作者： Li, YM Qu, XH Huang, BY Qiu, GH CENT S UNIV TECHNOL NATL KEY LAB POWDER METCHANGSHA 410083PEOPLES R CHINA

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关键词： metal injection molding feedstock binder viscosity