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硅硼玻璃在可伐合金表面的润湿规律 沈卓身1,罗大为2 (1.北京科技大学材料科学与工程学院,北京,100083;2.北京科技大学材料科学与工程学院,北京100083;3.深圳职业技术学院应用化学与生物技术学院,广东深圳518055) 摘要:采用座滴法研究硅硼玻璃在分别具有FeO和FeO+Fe_3O_4氧化膜的可伐合金表面1000℃保温不同时间的润湿规律.用数码显微镜测量硅硼玻璃在可伐合金表面的接触角和润湿直径,用SEM研究晕圈的表面形貌以及玻璃和金属的截面形貌,并用能谱分析不同晕圈处的化学成分.结果表明:随着润湿时间的延长,玻璃在具有FeO和FeO+Fe_3O_4氧化膜的可伐合金表面的接......
Associated rules between microstructure characterization parameters and contact characteristic parameters of two cylindersZHOU Wei(周炜)1, 2, TANG Jin-yuan(唐进元)1, 2, HE Yan-fei(何艳飞)1, 2, LIAO Dong-ri(廖..., Changsha 410083, China)Abstract:The contact strength calculation of two curved rough surfaces is a forefront issue of Hertz contact theory and method. Associated rules between rough surface......
Processing, Properties and Microstructures of Ag-ZnO Electrical Contact Composites周继扣,马福康,孙秀霞,刘茂林摘 要:1IntroductionSeveralsilvermatrixcompositeshavebeendevelopedtosubstitutetoxicAgCdOinrecentyears.AgZnOisoneofthemostexpected...关键词:......
,接触电阻随着列车速度的增加呈现出先增大再减少又增大的趋势,接触电阻随速度变化出现2个极值,说明接触压力与列车运行速度和牵引电流存在着最佳匹配关系.关键词:弓网系统;电接触;接触电阻;接触压力Characterization of contact resistance between pantograph and catenary systemWANG Wan-gang1, 2, WU..., Chengdu 611731, China)Abstract:The static and dynamic contact resistance was studied with different contact pressures and traction currents. The results show that the static contact resistance of pantograph......
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Tribological properties of electroless Ni-P-SiC composite coatings in rolling/sliding contact under boundary lubricationShu-Hue Hsieh,Shen-Jenn Hwang,Ting-Kan Tsai,Wen-Jauh Chen摘 要:contact under boundary lubrication condition using a two-roller tribometer. The measurement contained friction coefficient......
. The lamellar cohesion, oxide inclusions and porosity were critical factors that controlled the fretting wear resistance. In the view of contact mechanics, the fretting wear behavior of plasma spraying coatings was characterized. 关键词:Plasma spraying; Coating; Fretting wear; Fatigue delamination; Contact mechanics; [全文内容正在添加中] ......
Morphology and electrical contact properties of electrical connection materials in corrosive atmosphereZhi-Gang Kong,Liang-Jun XuResearch Laboratory of Electrical Contacts,Beijing University of Posts... by stereoscopic microscope and scanning electron microscope. Chemical constitution was examined by X-ray energy spectrum. The contact resistances were measured by four-point method. The experiment results show......
Contact Resistance and Arc Erosion of Tungsten-copper Contacts in Direct Currents马窦琴1,2,XIE Jingpei1,2,LI Jiwen1,WANG Aiqin1,WANG Wenyan1,21. School of Materials Science and Engineering, Henan.... The contact resistance, arcing energy, and arcing time were continuously measured by JF04C contact materials test system. Changes in tungsten-copper contact surface were observed by SEM. The test results......
滚角与侧滚角系数,等效锥度和轮径差的影响. 2.1 轨距 当窄轨距为1 432 mm,标准轨距为1 435 mm,宽轨距为1 440 mm时,3种车轮踏面与该钢轨断面匹配时的接触几何参数如图9所示. 图9 轮轨接触几何参数随轮对横移量的分布 Fig. 9 Distributions of wheel-rail contact geometric parameters with wheelset...随横移量变化规律基本相反.轮背内侧距取为1 350,1 353和1 356 mm时的轮轨接触几何参数随横移量的分布如图10所示. 图10 轮轨接触几何参数随轮对横移量的分布 Fig. 10 Distributions of wheel-rail contact geometric parameters with wheelset lateral displacement 由图10可见:当轮背内侧......