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Preparation and Properties of Cf-TiB2-Cu-Graphite Composites Shaofan XU1,a, Shaoping XU2,b, Chengnan ZHU1,c, Chuanyong YUAN1,d 1School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 China; 2School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei 230009 China a teacherxu1955@yahoo.com.cn ,b xushaoping2006@hotmail.com , c chengnan0519@163.com ,d wsycy@hotmail.com Keywords: carbon fiber; conductive ceramic; composites; resistivity; bending strength; wear resistance Abstract.
Copper-graphite composite material, the most popular metal-graphite brush material can no longer meet the requirement of the time as the development of motor industry calls for better performed brush material.
I Material preparation and experiment methods 1.1 Preparation of composite materials The materials used in the experiment are as follows: a) carbon fibers, produced by Shanghai Carbon Works, the tensile strength of which is 2580MPa, density 1.77g/cm3, single wire diameter less than 7μm; b) conductive ceramic particles TiB2, produced by Hunan Changsha Hengchang Chemical Industry Ltd., which were prepared after 320 mesh; c) copper powder, produced by Beijing Youyan Powder Company, Ltd., which was electrolytic copper powder of 320 mesh; d) graphite powder, produced by Shangdong Nanshu Graphite Mine, which was 300-mesh flake graphite powder.
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Materials and Methods Materials.
Acknowledgement The authors are grateful to the Chinese national natural science fund for its financial support for this research. 
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With the development of more than 30 years, the fractal theory is now widely applied in both natural science and social science [2-3].
When machining some hard and crisp materials, such as semiconductor, ceramic and optical glass, the incising processes are usually executed by using a thin dicing blade or grinding wheel.
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.% SiCp/Al) Using Al-15Cu-8.5Si-4Ni-1.5Mg Filler Metal Juan Li1, a, Kehong Wang1, b 1School of Material Science and Engneering, Nanjing University of Science and Technology, Nanjing, China alijuanaishenghuo@163.com, bwkh1602@126.com Keywords: SiCp/Al composites, Vacuum brazing, Tempurature, Holding time Abstract.
(With a special technological process to improve the wettability between aluminum and SiC during the preparation of materials, only Si can be detected from the surface of SiC particles.)
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Material and Methods 2.1 Materials Multiwalled Carbon Nanotubes (CNTs) were supplied by Graphene supermarket with specifications of carbon content, > 94%; outer diameter, 50-85 nm; length, 10-15 μm; nitrogen specific surface area, 75 m2/g.
Specific surface area and pore volume of CNTs and CNTs/chemical agents Materials Surface area(m2/g) Pore volume(cm3/g) CNTs 75 N.A.
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In micro-EDM machining process, the debris of materials is difficult to be removed form the discharging gap.
Using this technique, the success of a micro-axis machining, tool steel and processed materials in a tiny hole milling, processing effect is good, indicating that the technique has a good application value.
Acknowledgements This work was financially supported by the Natural Science Foundation (50775128, 51075239), Reference [1] Zhang Yong, Wang Zhenlong, Li Zhiyong, Yang Yang, et.
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Zhang, Molecular Dynamics Simulation of Shock Wave Propagation in Aluminum Single Crystal, Journal of Metastable and Nanocrystalline Materials 36 (2023) 1-6
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Коval’, Yu.F.Ivanov, Nanostructuring of surfaces of metalloceramic and ceramic materials by electron-beams.
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Experiment Experimental materials.
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