Materials Science, Mechanical Engineering and Applied Research

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Authors: Wen Ying Shi, Hong Bin Li, Rong Zhou
Abstract: A novel composite catalytic membrane as heterogeneous acid catalyst for biodiesel production was prepared from zirconium sulfate (Zr (SO4)2) and sulfonated poly (vinyl alcohol) (SPVA) solution supported on/inside PET non-woven fabrics by the phase inversion method. Membrane structure was characterized by Field Emission scanning electron microscope (FESEM). The effect of polymer concentration on membrane morphologies was investigated. The catalytic performance of the composite membrane demonstrated an increasing from 73.04% to 56.72% with the increasing the membranes porosities increased from 37% to 68%. And the optimum molar ratio of methanol/oleic acid to produce methyl esters was 3:1.
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Authors: Xiao Qing Si, Hong Yun Zhao, Yi Xuan Zhao, Xiao Guo Song, Xiao Tian
Abstract: The Q345E lamellar tearing resistant steel with 140mm thickness was welded by submerged arc welding (SAW). The microstructure and properties of the welded joints were investigated. Affected by the long-term welding thermal cycle, microstructure at different thickness has great differences. The hardness in the weld center is higher about 55 HV than the base metal. Due to the grains refinement of the microstructure at 1/2 thickness was more obvious, the microhardness of this zone has a more obvious dispersion degree. The average grain size of ferrite at the 1/4 thickness is about 10 μm, which resulted in two samples at this thickness obtain a higher tensile strength (496.568 MPa and 496.36 MPa). Moreover, part of the pearlite lamellar in the HAZ at 1/4 thickness had been fragmented and spheroidized.
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Authors: Hua Xiang Zhou, Zheng Zhou, Jing Ping Liu
Abstract: Cylinder Liner design innovation goal is energy conservation. As the main friction parts engine cylinder liner, reducing friction energy is energy saving basic requirements. Materials research cylinder sleeve is one of the main cylinder liner saving research. Through the piston ring and cylinder liner surface friction dual material hard phase, self-lubricating phase, toughening phase analysis, select compatibility, high strength, heat resistance, good high temperature performance, ease of manufacture, price rational matrix material and an appropriate proportion of nanoscale hard material, self-lubricating materials, ductile materials, using appropriate methods cladding and processing, design developed high-temperature self-lubricating cylinder sets of advanced materials. The latest international high temperature, wear-resistant, self-lubricating materials research: modern nanoα-Al2O3+Ni-base alloy composite materials, Ti2B/Fe metal-ceramic composites, metals and ceramics NiCr-Cr3C2 particles CaF2 self-lubricating composite alloy powder material, NiCr/Cr3C2-WS2 self-lubricating wear-resistant materials were studied and found to TiC, Al2O3 is hard reinforcing phase, CaF self-lubricating phase, NiCr/TiC eutectic toughening phase, high-temperature self-lubricating wear-resistant nanocomposite, and Cr18Ni9 class alloy as base material, by laser cladding method enables conventional cylinder liners manufacturing technological breakthroughs, has practical value.
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Authors: Hua Xiang Zhou, Zheng Zhou, Jing Ping Liu
Abstract: NO is the product in Cylinder fuel combustion at temperature. With nitrogen oxide emissions worldwide increasingly stringent standards to reduce NO emissions are the main research topics of modern environmental protection. Selective Catalytic Reduction (SCR) technology has been used outside the engine, the catalyst is researched is a more advanced. Because NO is mainly produced in the high temperature, NO is broken down in Cylinder is a more efficient and feasible approach in high temperature Catalytic. NO bonding strength decreased at a high temperature, it is easy to activation with N+ and O-. An effective diverse nanomaterials is being researched in electron transfer Catalytic. Proportion of multiple catalytic material, the microstructure, grain size, the intermediate material is important. Catalytic nanocomponent materials: Co / Al2O3, Ni / Al2O3, Pt / Al2O3, Pt-Co / Al2O3, Pt-Ni/ Al2O3, Pt-Ru, NiO / CNTs, Co3O4/CNTs, SiO2/ Co3O4, Pd / Ru, TiO2 etc. are researched. Catalytic materials: Co3O4, Pd / Ru, Pt-Ni, the matrix material: Al2O3, CNTs, SiO2, TiO2, efficient catalysts: Pt-Ni/ Al2O3, Co3O4/CNTs, SiO2/ Co3O4 be found. All of these research for the design of high temperature catalytic decomposition of NO cylinder provides a theoretical basis.
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Authors: Fwu Hsing Liu, Wen Hsueng Lin, Ruey Tsung Lee, Hsiu Ping Wang, Liang Wang Lee
Abstract: In this work, a hydroxyapatite (HA) bioceramic and a silica binder were used as the raw materials for manufacturing bioceramic bone scaffold after sintering by a laser beam in a home-made 3D Printing (3DP) machine. Results indicate that the bending strength of the scaffold can be improved after heat-treatment. While simultaneously increasing surface roughness conducive to osteoprogenitor cell adhesion. The processing parameters of a 90 mm/s laser scanning speed, 12 W of laser energy and 10 kHz of scanning frequency were used to fabricate a porous scaffold model, which possesses suitable biocompatibility and mechanical properties, allowing adhesion and proliferation of bone cells. Therefore, this process has great potential for manufacturing bone scaffolds.
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Authors: Hong Mei Chen, Jian Mei Chen, Song Wang, Wu Tao Li, Fan Gui Meng, Wen Jie Chen, Liang Li, Shi Jie Yao
Abstract: The B2O3-SiO2 binary system has been thermodynamically reassessed with CALPHAD approach. The substitutional solution model is adopted for liquid. A set of self-consistent parameters capable of reproducing the corresponding experimental phase diagram data and subliquidus immiscibility data has been obtained.
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Authors: Hong Mei Chen, Jian Mei Chen, Song Wang, Wu Tao Li, Fan Gui Meng, Wen Jie Chen, Liang Li, Shi Jie Yao
Abstract: The SiO2-ZrO2 binary system has been thermodynamically assessed with CALPHAD approach. The substitutional solution model is adopted for liquid. A set of self-consistent parameters capable of reproducing the corresponding experimental phase diagram data and liquidus immiscibility data has been obtained.
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Authors: Liang Chen, Jian Guo Tang, Sheng Dan Liu, Xin Ming Zhang, Xiang Li, Bin Chen, Yun Lai Deng
Abstract: The evolution of through-thickness strain gradients during snake rolling (SR), which introduces an horizontal offset between upper and lower rolls, of Al-Mg-Si-Cu sheets was investigated with the inscribed lines in side including rolling and normal direction of sheets. The complete pole figures were used to investigate the influence of such rolling on texture evolution. The results revealed that the SR rolled sheet developed a continuous through-thickness shear strain gradients and shear textures. The surface in contact with the slower roll (the lower roll) developed the largest shear strain and the strongest shear texture. While for the conventional symmetric rolling (CR), the sheet developed a small shear strain gradient which is symmetrical about the centerline of the sheet with nearly negligible shear strain and texture at the center of the sheet.
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Authors: Xiang Bo Suo, Ji Qiu, Shi Ning Ma, Hong Mei Wang
Abstract: In this article, a nano-SiO2/micro-arc oxide composite coating layer was prepared on the surface of 7A52 Aluminum alloy by addition of SiO2 nanoparticles into the micro-arc oxidation electrolyte to enhance the performance of the formed oxidative layer. Then, the composite oxidative layer was characterized by X-ray Photoelectron Spectroscopy (XPS) to investigate its elemental and chemical compositions, as well as their respective distributions. The results revealed that at elevated temperatures resulted from micro-arc discharge, the SiO2 in the composite reacted with Al2O3 (the major content of the micro-arc oxidative layer) to form a new compound known as mullite. In addition, the contents of SiO2 and γ-Al2O3 in the inner layer of the oxidative layer were lower than those in the surface layer. This can be explained by the higher temperature in the inner layer which motivated the formation of mullite and α-Al2O3 from SiO2 and γ-Al2O3 respectively during the micro-arc oxidation process.
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Authors: Bai Wen Zeng, Sheng Shui Wang, Zi Ping Wang, Ming Hua Tang, Ding Lin Xu
Abstract: The heterostructural film combining ferroelectric layer Pb0.8La0.1Ca0.1Ti0.975O3 (PLCT) with semiconductor layer Zn0.99La0.01O (ZLO) was deposited between Pt electrodes by chemical solution deposition (CSD) method. The Pt/PLCT/ZLO/Pt structure device exhibits either memory or threshold resistance switching (RS) by setting the compliance current (ICC) at room temperature. The memory RS with a large ON/OFF ratio (∼104) is triggered by a high ICC, while the threshold RS appears by setting the compliance current to a relatively low value. The physical mechanisms for the memory and threshold RS are discussed and attributed to the formation of an oxygen vacancy conductive filament and the electrical field induced breakdown, respectively.
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