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Study on the failure mechanism of Ag-Ce co.tacts in DC level

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 449-452页

作者： MENG Fan-bin LU Jian-guo LU Ning-yi CHEN Zhi-chao CHEN Qi School of Materials Science and Engineering Hebei Univertity of Technology Tianjin 300130 China hongfa electroacoustic co. Ltd Xiamen 361021 China

Nominal co.tact resistance, minimum erosion and material transfer are required with low co.t materials working in a wide currents range for DC relays. Ag-Ni co.tact materials have low co.tact resistance, but the erosion and material transfer are large at high current level. Ag-SnO2 co.tact materials have good anti-welding properties and resistance to arc erosion, but they have large co.tact resistance during working and are easily block SnO2 from flocking together on the surface at low current level. In this paper, the failure mechanisms of Ag-Ce co.tact material were studied. The surface morphologies of the co.tacts after electrical endurance test for Ag-Ce co.tact material were co.pared with that of Ag-Ni and Ag-SnO2 co.tact materials. The effect of Ce on the surface morphologies of the co.tacts after electrical endurance test was analyzed.

关键词： Relays Electric co.tact Failure analysis

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Classifications and Functions of Vitreoretinal Surgery Assisted Robots——A Review of the State of the Art

Classifications and Functions of Vitreoretinal Surgery Assis...

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作者： XIAO Jingjing WU Qiyan SUN Daoheng HE Changyan CHEN Yiqi School of Aerospace Engineering Xiamen University Xiamen hongfa electroacoustic co. Ltd School of Mechanical Engineering and Automation Beihang University The Eye Hospital of Wenzhou Medical University

To overco.e the surgeon’s manual operation limitations in vitreoretinal microsurgery,many kinds of robots are developed to enhance the operation accuracy,including Master-Slave Teleoperation Robot（MSTR）,Hand-Held Robot（HHR）,co.perative Robot（CR） and Micro Robot（MR）.With the introduction of vitreoretinal surgical assisted robots（VRSARs）,the surgeon’s operation skills can be improved through various functions of the robots,such as depth information perception,improvement of the surgical precision,and micro-force perception and *** description and classification of the latest research progress of VRSARs,the current problems of each type of VRSARs were discussed and future works summarized for further research.

关键词： Vitreoretinal Surgery Assisted Robots(VRSARs) Depth Information Perception Improvement of Surgical Precision Micro-force Perception and Feedback

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