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Effect of copper addition on the thermal contraction of indium melt clusters

Rare Metals 2003年第3期22卷 215-220页

作者： CHENGSujuan WANGZhonghua QINXubo BIANXiufang KeyLaboratoryofLiquidStructureandHeredityofMaterials MinistlyofEducationShandongUniversityJinan250061China ShandongDacahengPesticideCo.Ltd. Zibo255000.China

The structure of In-1 %Cu and In-5%Cu (mass fraction) alloy melts werestudied at different temperatures above liquidus by using a high-temperature X-ray diffractometerand were compared with that of pure In melt. Experimental results show that with the addition of 1%Cu or 5% Cu, the thermal contraction phenomenon of atom clusters occurs in melts with thetemperature increasing like pure In melt. With the addition of 1% Cu, the thermal contraction ofatom clusters increases and the contraction is not homogeneous in the whole measurement temperaturerange. The sudden change and noticeable contraction can be found in the range of 280-390 ℃. Thetemperature range of the sudden change is lower than that of pure In melt. With the addition of 5%Cu, the thermal contraction of atom clusters decreases and the contraction is not consistent in thewhole measurement temperature range. The anomalous change can be measured at about 600 ℃. At thesame superheating temperature, the nearest interatomic distance r_1 of the melts containing copperis smaller than that of pure In melt, implying that the cluster structure of melts containing copperis more compact.

关键词： liquid structure thermal contraction X-ray diffraction cluster copperaddition in melt

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Studies on thermal contraction of Crankshaft Bearings under Extreme Low Temperatures

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Journal of thermal Science 2015年第5期24卷 496-501页

作者： Sever-Alexandru Haba Gheorghe Oancea Manufacturing Engineering Department Transilvania University of Brasov

This paper presents how the contractions of the main components of a V6 motor with low engine displacement are determined for the cold-start phase under extreme low temperature. Internal combustion engine components have complex geometries and to obtain the thermal contractions, in the research, used the method of finite element analysis. The phenomena of thermal contractions are studied for the cold-start situations at extreme low temperature, knowing that the cold-start phase of an internal combustion engine is the main factor that determines moving rotational and translational parts wear life. Checking the proper choice of clearance is particularly important, as the use of inappropriate values of it leads to rapid operation destruction of the engine group components. The results obtained for the thermal clearances of crankshaft bearings are mathematically modeled and the relations can be used for calculating the clearances. The mathematical models are also useful for implementing in different software tools.

关键词： Engine Engine block Crankshaft bearings thermal contraction FEA

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Precursor route synthesis and thermal contraction of compounds ZrW_(2-x)Mo_xO_8 (x=0, 0.4, 0.6, 0.8, 1.2, 1.6)

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Chinese Journal of Chemistry 2000年第4期18卷 571-575页

作者：张山鹰赵新华马辉吴辛友 Department of Chemistry Beijing Normal University Beijing 100875 China Analyzing and Testing Center Beijing Normal University Beijing 100875 China National Center of Analysis ( Testing for Non-ferrous Metals & Electronic Materials Beijing General Research Institute for Non-ferrous Metals Beijing 100088 China

A series of title compounds as well as their precursors were synthesized by precursor route. Their PXRD patterns were characterized with ZrW2O8 or ZrMo2O8 model by Rietveld method. The thermal contractions of the compounds were determined according to the variable-temperature PXRD data and NTE coefficients were presented. The two-phase mixture of ZrW0.4Mo1.6O8 was also analyzed individually.

关键词： thermal contraction precursor route,ZrW2-x- MoxO8

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