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B. Denkena D. Boehnke J. Dege N. Hajibeik 《Materialwissenschaft und Werkstofftechnik》2008,39(9):604-609
Influence of the process variables on the workpiece form accuracy in the machining of parallel compounds out of AlSi9Cu3 ‐ GJS400 To guarantee excellent work piece quality for the machining of compound materials characteristic interactions between the components have to be considered in the process design. Especially by parallel compounds, where the different components are processed in an alternating manner, the machinability of the compound differs considerably from the machinability of each homogeneous component. Depending on the compound partner the surface topography of a component can vary considerably. Rotationally symmetric compound work pieces primary hold radius and transition deviations. In addition to unequal tool and workpiece deflection the radius deviations results from the different topographies in each component. The surface topography and its measurement methods as well as the process parameters and their influence on the process forces have to be considered for a proper process design. 相似文献
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与锂元素相比,钠元素在地壳中储量丰富、分布均匀又价格低廉,继锂离子电池研究受限后,钠离子电池又重新引起了研究者们的关注。在众多钠离子电池电极材料中,锡基金属氧化物因具有较高的理论比容量(1378 mA·h/g),近年来备受青睐。据文献可知,不同纳米结构的锡基氧化物材料表现出不同的电化学性能。本文从钠离子电池锡基金属氧化物亟待解决的问题出发,系统地总结了特殊形貌的锡基金属氧化物、低维度纳米结构的锡基氧化物材料的复合化、三维结构的锡基氧化物材料复合化、核壳结构的锡基氧化物材料的复合化、特殊结构的锡基氧化物材料的复合化的纳米结构特征及其电化学性能,并展望了锡基氧化物材料的面临的挑战。 相似文献
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Hakan Erer Okan Zafer Ye?ilel Necmi Dege Yelda Bing?l Alpaslan 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(2):411-415
A novel 1D coordination polymer {[Ni(μ-sq)(H2O)2(tmen)]·H2O}n (H2sq = squaric acid and tmen = N,N,N′,N′
-tetramethylethylenediamine) has been synthesized and structurally characterized by X-ray crystallography. The spectral (IR
and UV-vis.) and magnetic susceptibility are reported. The structure of the complex consists of the bidentate tmen ligand
bound to Ni(II) center and a bridging squarate in the 1,3-bonding mode. The distorted octahedral geometry of Ni(II) is completed
by two aqua ligands. The structure contains chains of squarato-O
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,O
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-bridged polynuclear nickel(II) units held together by intermolecular hydrogen bonds interactions between water molecules
and oxygen atoms of squarate ligand forming a novel R6 motif. 相似文献