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Zhao G.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Peng X.,Key Laboratory of Polymer Processing Engineering
Polymer Composites | Year: 2015

It is essential to examine the mechanisms of plastic deformation of polymer composites under external loads and large strains, especially if the material is intended to be used in a dynamic environment. This work investigated the variation of structure as well as the properties of poly(e{open}-caprolactone) (PCL) deformed under different tensile draw ratios and strain rates. The PCL/HA composites were prepared by melt mixing the PCL with up to 10 wt% HA in a twin-screw extruder. The deformation behavior of the PCL/HA composites revealed a strong correlation between the mechanical response and the accompanying structural transformations. It was found that the strain rate and stretching ratio played important roles in modulating the molecular orientation and crystallization of the PCL/HA composites. The increase in strain rate from 0.2 to 100mm/min led to the variation of crystallinity from 56.81 to 67.50%. With an increase of the strain rate, the chain extension rate along the stretching direction increased faster than the chain relaxation, which improved the orientation of the polymer chains. The crystallinity and orientation of the deformed PCL/HA composites increased with an increase in draw ratio. The composites also possessed enhanced yield strength resulting from an increased strain rate. © 2015 Society of Plastics Engineers. Source


Zhao H.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Zhao G.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education
Polymer Engineering and Science | Year: 2016

A systematic study on the rheological properties helps to identify suitable processing and compositional windows for foaming polylactic Acid (PLA)/poly ε-Caprolactone)(PCL) blends. In this article, the correlation between the rheological behavior, the blend morphology, as well as the resultant cellular structure of microcellular injection molded PLA/PCL blends was investigated. The addition of PCL had a significant effect on the storage modulus of PLA melts. With increasing the PCL content (less than 30%), the storage modulus increased due to the entanglement of polymer chains. The enhancement on their complex viscosities led to a better foaming behavior and pore microstructure. Porous structures with enhanced pore uniformity, decreased cell size, and higher cell density were observed in the PLA/PCL (70:30) specimens. © 2016 Society of Plastics Engineers. Source


Li F.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Zhang J.D.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Zhang J.D.,Shandong University | Luan J.P.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Liu Y.L.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education
Materials Science Forum | Year: 2016

The graphite was used as pore-forming agent to prepare porous NiO-Yttria-stabilized zirconia(YSZ) anode material. The influence of the content of pore-forming agent of the anode material, and the change of the anode material before and after the reduction of NiO were investigated. It was found that the porosity and shrinkage rate of the anode increased with the addition of the pore-forming agent, and the thermal shock resistance also improved. We chose Y(NO3)3·6H2O and ZrOCl2·8H2O as raw materials, ethylene glycol monomethyl ether as solvents to make collosol. And electrolyte membrane on the Si piece was prepared by spin-coating. The electrolyte membrane would be thinner if it spined faster and longer. Then we chose the anode material as support to prepare electrolyte membrane. The thickness of the electrolyte membrane increased with the increase of the number of layers. Two layers were the most appropriate. © 2016 Trans Tech Publications, Switzerland. Source


Zhang J.-D.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Zhang J.-D.,Shandong University | Li H.-Y.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Gou J.-Y.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Composite powder of Fe (as shell) and Al (as nuclear) (Fe-Al) was produced by electroless plating. Using Q235 steel as substrate, Fe-Al and Al2O3 composite powders as coating materials, the Fe-Al intermetallic coatings were fabricated by plasma spraying. Fe-Al intermetalic compounds were formed under thermal spray process from Fe-Al coated powders. Coating composition gradient was achieved by real-time control of mixing ratio of Fe-Al coated powders and Al2O3 powders during the deposition processes. The phase and microstructure of the coatings were studied by SEM and XRD. Adhesive strength and thermal-shock resistance of coatings were also tested. The results indicate that the coatings are composed of Al2O3, Al, Fe3Al and FeO. The intermetallic is in-situ synthesized from Fe-Al. When Fe-Al as bottom combines steel substrate, the bonding strength and thermal shock resistance of FeAl/Al2O3 graded coatings is remarkably higher than Al2O3 coating. The gradient change distribution and the in-situ synthesis of composition improve the combining state and increase the bonding strength and thermal shock resistance of coatings. ©, 2015, Rengong Jingti Xuebao/Journal of Synthetic Crystals. All right reserved. Source


Shen Z.-Q.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Tian X.-L.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Zheng H.-L.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | Li T.-T.,Key Laboratory for Liquid Solid Structural Evolution and Processing of Materials Ministry of Education | And 3 more authors.
Zhuzao/Foundry | Year: 2012

The morphology, size and composition of spheroidal graphite(SG) nuclei were researched by casting a series of different samples which were treated by the same nodulizer and different inoculants. Wedge and chill test pieces used for chemical analysis were cast. The observation of the SG nucleus was done by using of FE-SEM. The results indicate that the morphologies of SG nuclei are different, including spherical, conical, polygonal and so on. The SG nucleus consist of sulfide, oxide and carbide, and the size is about 0.6-7 μm. Not only single core but also double and multiple cores are found in SG nuclei. The mismatch between most nuclei compounds and graphite is small, so compounds are good nucleating sites for SG. For the δ between the SiO 2 and graphite is large, SiO 2 can act as spherical graphite substrate only after the combination with SiC. Source

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