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Sheng S.X.,Xijing University | Guo Y.L.,Yongcheng Vocational College | Liu S.F.,Xijing University | Wu S.L.,Xijing University
Advanced Materials Research | Year: 2014

In this research, one solid state processing technique, friction stir processing, is applied to modify the AZ61 magnesium alloy billet. The FSP modified AZ61 alloy could be refined to 3-8 μm via the dynamic recrystallization during processing. The AZ61 magnesium alloy billet with 75μm grain size could be refined to about 7.5μm by four-pass friction stir processing. The hardness of the stirred zone could increase to around 70-80 after friction stir processing, and after a further compressive strain of about 3% could raise the hardness to 81. The ductility of the weld direction specimens of the modified alloy could have a 235% elongation at 300°C and 1×10-4 s-1. The grain boundary sliding (GBS) might be the dominant deformation mechanism during superplastic deformation. © (2014) Trans Tech Publications, Switzerland. Source

Yan Z.,Henan University of Science and Technology | Wang D.,Yongcheng Vocational College | Huang J.,Henan University of Science and Technology | Gu Y.,Henan University of Science and Technology | Zhang Y.,Henan University of Science and Technology
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2013

The sintering characteristics, microwave dielectric properties, phases and microstructure of Cu-doped ZnTiNb2O8 ceramics prepared by solid-state reaction method have been investigated systematically. It was found that the addition of Cu powder lowered the sintering temperature of ZnTiNb2O8 ceramics to 950°C. The results showed that the microwave dielectric properties of Cu-doped ZnTiNb2O8 ceramics were strongly dependent on densification, crystalline phases and grain size. The specimen with 3.0wt% of Cu powder additive sintered at 950°C for 3 h possessed an excellent combination of microwave dielectric properties: εr=30.2, Q×f=27537 GHz (f=6.7743 GHz), τf=-57.1 μ°C-1. Due to their good dielectric properties, the Cu-doped ZnTiNb2O8 ceramics are very promising candidate for LTCC dielectric materials. Source

Zhao Q.-L.,North China University of Water Conservancy and Electric Power | Chen F.-J.,Yongcheng Vocational College | Wang Y.-Y.,North China University of Water Conservancy and Electric Power | Zhang B.-L.,Henan Agricultural University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

The low bulk density of straw is one of the major barriers, which blocks the collection, handling, transportation and storage. Densification of biomass into briquettes/pellets is a suitable method of increasing the bulk density of biomass. Yet in the process, a tremendous amount of air is ejected from biomass grind, which brings substantial specific variation including combustion property. Among them, combustion property is critical for proper design and operation of burning facilities. Therefore, a series of tests about combustion properties of 75mm diameter corn briquettes were done. First, the combustion process (ignition, full flaming and glowing phases.), precipitation oftar were investigated by a heating stove, then, Some ash sample from the muffle burner was subjected to an ash melting characteristic test.The results show the combustion of briquettes takes more time than that of raw straw from ignition to complete combustion; in order to meet complete combustion in a short time, the raw straw needs more supply air volume than briquettes under the same α value; the temperatureof furnace chamber should been controlled under 900°C, which help to reduce the dark smoke, tar and slag. © Maxwell Scientific Organization, 2013. Source

Liu S.-F.,Xijing University | Xue F.,Yongcheng Vocational College | Wu S.-L.,Xijing University
Advanced Materials Research | Year: 2014

This study is aimed to investigate the spring-back angle of clad metal sheet in bending process by using finite element simulation and experiment to meet the growing requires in the application of clad metals. In this study, the clad metals processed into 1mm thick from CU11000 and AL1050 were bent 90°C over a die with a bend radius of 1mm. The results show that there is not any relative sliding, crushing or peeling occurred in the junction of the clad material during the bending process, the spring-back angle of the clad metal is always smaller than each single metal and the CU content increasing also caused spring-back angle become small. The configuration of a harder material (CU11000) in tensile side also has a smaller spring-back angle. © (2014) Trans Tech Publications, Switzerland. Source

Wang T.,Henan Institute of Science and Technology | Zhang Y.,Yangzhou University | Ding T.,Yongcheng Vocational College
Materials Letters | Year: 2014

A one-step in situ solvothermal method was proposed for the synthesis of SnIn4S8/TiO2 nanocomposite with 6.5 mol% SnIn4S8, using SnCl4·5H2O, InCl3·4H2O, thiourea, tetrabutyl titanate and absolute ethanol as the source materials. The structure, composition, BET specific surface area and optical property of the as-synthesized SnIn 4S8/TiO2 nanocomposite were characterized by powder X-ray diffraction, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy, N2 adsorption and UV-vis diffuse reflectance spectra. The photocatalytic activity of the as-synthesized SnIn 4S8/TiO2 nanocomposite was tested in the reduction of aqueous Cr(VI) under visible-light (λ>420 nm) irradiation, and compared with those of nanostructured SnIn4S 8 and TiO2. The photocatalytic results demonstrated that the as-synthesized SnIn4S8/TiO2 nanocomposite exhibited much higher visible-light-activated photocatalytic activity than SnIn4S8 and TiO2 nanoparticles. The reasons accounting for the photocatalytic results were also discussed. © 2014 Elsevier B.V. Source

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