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Size effect of sandstone after high temperature under uniaxial compressionSU Hai-jian(苏海健)1, JING Hong-wen(靖洪文)1, MAO Xian-biao(茅献彪)1, ZHAO Hong-hui(赵洪辉)1, YIN Qian(尹乾)1, WANG Chen(王辰)2(1. State Key... of Mining & Technology, Beijing 100083, China)Abstract:Uniaxial compression tests on sandstone samples with five different sizes after high temperature processes were performed in order to investigate......
27Al MAS-NMR study of inorganic polymer formation at ambient temperature Sang-Wook AHN1, Hee-Soo LEE2, Wan-Hee YANG3, Jung-Woo LEE3, Young-Keun JEONG1 1. National Core Research Center for Hybrid... such as aluminosilicate. A study of 27Al MAS-NMR was carried out in an attempt to understand the reaction mechanism of the inorganic polymerization at ambient temperature. Scanning electron microscopy (SEM) and X-ray......
Received 28 July 2006; accepted 15 September 2006 Abstract: Magnesium alloy AZ91 was prepared by powder metallurgy method, and the effect of sintering temperature on the densities and microstructures of the alloys was investigated. The results show that tight control of the sintering temperature within a narrow range around the liquidus level generates structures with high integrity and reduces......
simulated. In the solidification process, the temperature history data of ingot and mold were recorded with a data acquirement system. Based on the experimental data, nonlinear estimation method and finite... indicate that the heat flow in the interface of ingot and mold can be described by exponential function. The heat transfer coefficient related with boundary temperature is better reflecting the true......
Temperature gradients in concrete box girder bridge under effect of cold waveGU Bin(顾斌)1, CHEN Zhi-jian(陈志坚)2, CHEN Xin-di(陈欣迪)3(1. College of Civil and Transportation Engineering, Hohai University..., China)Abstract:The temperature distributions of a prestressed concrete box girder bridge under the effect of cold wave processes were analyzed. The distributions were found different from those under......
Microstructure Development of Directionally Solidified Nb-Ti-Si Based Ultrahigh Temperature Alloy () 摘要:Integrally directional solidification of an Nb-Ti-Si based ultrahigh temperature alloy was performed in an ultrahigh temperature and high thermal gradient furnace with the use of ceramic crucibles. The microstructural evolution with the withdrawing rate increasing during directional......
Research on Mediate Temperature Decomposition of High Nitrogen Austenite HU Ming-juan1,LI Xiao-ling1,BEI Duo-hui1,ZHU Zu-chang1 (1.School of Material Science and Engineering, Shanghai Jiao Tong... are composed of highly dispersed α-Fe and γ-Fe4N, with both of them maintaining nanometer scale. The micro-hardness of them can be as high as900HV. 关键词:high nitrogen austenite; mediate temperature......
fluctuations of the free surface of liquid steel in the mold,two different models with the same casting conditions but different thicknesses were employed to analyze the hydrodynamic behavior at the top... to observe four three-dimensional vortexes that interact with the submerged entry nozzle(SEN)and mold walls.By using a biphasic model to simulate the interface between the liquid and air inside the mold......
and this machined pattern core was installed in a mold for injection molding of prism patterned plate. Polymethyl methacrylate (PMMA) was used as a molding material. The pressure and temperature of the melt... pattern depends on the processing conditions including mold temperature, injection rate, packing pressure and time or melt temperature, etc, but the replication will vary significantly according......
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