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Hafnium carbide structural foams synthesized from polymer precursors FAN Hai-bo, YANG Hong, N. K. RAVALA, H. C. WIKLE III, R. H. ZEE, B. A. CHIN 275 Wilmore Labs Auburn University, Auburn, AL 36849-5341, USA Received 20 April 2006; accepted 30 June 2006 Abstract: Hafnium carbide (HfC) was applied in space and aerospace due to its ultra high melting temperature, high specific strength......
="ChDivSummary" name="ChDivSummary">By employing zinc acetate and sodium hydroxide as raw materials, ultrafine ZnO powders with different morphologies were successfully synthesized through hydrothermal method. The influences of the reaction temperature, the OH-/Zn2+ mol ratio and the reaction time on the morphologies of the ZnO powders were discussed. The reaction conditions were obtained, under......
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Microstructure Morphologies of Asphalt Binders using Atomic Force Microscopy李波1,2,YANG Jinyu2,CHEN Zhanquan1,LI Hailian1,21. Key Laboratory of Road & Bridge and Underground Engineering of Gansu...="ChDivSummary">We investigated microstructure morphologies of three asphalts(SK, Karamay, and Esso) used in China using atomic force microscopy(AFM). The topography and phase contrast images were obtained......
Study on Processing Conditions of Aluminum Matrix Composites Reinforced with Boron Carbide Particles YI XiaoSu1,Fu Xueying2,XI Huizhi2,Zhang Hong1 (1.National Key Laboratory of Advanced Composites,Beijing Institute of Aeronautical Materials,Beijing 100095,China;2.Material Department,Harbin Engineering University,Harbin 150001,China) Abstract:Different pre-heating of boron carbide particles......
Electrocatalytic Activity of Tungsten Trioxide Microspheres, Tungsten Carbide Microspheres and Multi-walled Carbon Nanotube-tungsten Carbide Composites陆洪智Faculty of Engineering, China University of Geosciences摘 要:Tungsten trioxide micropheres were prepared by spray pyrolysis, and tungsten carbide microspheres were produced by spray pyrolysis-low......
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,仅有少量粉末出现空心现象,由图1(d)观察到粉末内部组织主要为胞状组织,以及少量树枝状组织.表1所列为雾化粉末成分分析结果,粉末主要成分在气雾化前后无明显变化,N,O含量较低,分别为0.0073%和0.011%(质量分数). 图1 Rene104合金雾化粉末形貌及显微组织 Fig. 1 Morphologies and microstructures... Morphologies of defects in SLM-processed Rene104 samples 图8所示为选区激光熔化成形Rene104样品显微组织的透射电镜观察结果.从图8(a)的X-Y面和图8(b)的X-Z面显微组织中,均观察到了高密度的位错.由于晶内碳化物的存在,位错运动遇到阻碍,形成了位错塞积.如图8(c)所示,在晶界处发现了大量的位错缠结,以及碳化物钉扎位......
Adsorption of boron and its relationship with morphologies of TiCHai-Min Ding,Xiao-Liang Fan,Xin-Chun Zhang,Ze-You ZhengSchool of Energy Power and Mechanical Engineering,North China Electric Power University摘 要:First-principle calculations were performed to study the adsorption of boron and its relationship with the morphologies of Ti C.It is found......