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The Preparation, Microstructure and Propertities of the New Type 3D-Meshy SiC/Cu-Fe Composite Material

Author: WeiWenZuo
Tutor: RuHongQiang
School: Northeastern University
Course: Materials Science
Keywords: Friction materials 3D-Meshy SiC/Cu-Fe composite material Sol-gel method Metal oxide film Interfacial microstructure Mechanical property Friction and wear propertiy
Type: Master's thesis
Year: 2009
Downloads: 64
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Along with the direction of large-scale, high speed, the heavy load, and the high security of equipments, so the standard of the operational-performance of the friction material is being set higher and higher. A new type of braking material which has high hardness, good wear resistance and good friction and wear properties- the 3D-Meshy silicon carbide ceramic/metal composite has attracted people’s attention. But the interface between Skeleton and matrix has strongly affected physical and mechanical properties. In order to prevent or redue the interface reaction effectively between Skeleton and matrix, in this paper, metal oxide films have been prepared by Sol-gel method, at the same time, Cu-Fe alloy was to be used as the basal body of this complex material, Some researches of this material on the preparation, mechanical property, the interface organizational structure, and the friction and wear property were done.The results are as follows:(1) Well-proportioned Fe2O3, Al2O3, ZrO2 and MgO membrane can be prepared on the 3D-Meshy using different raw materials and processing methods. (2) The sintering process of this new type 3D-Meshy SiC/Cu-Fe Composite Material si that:Firstly,3D-Meshy SiC with different metal oxide films was imbedded inoreducing ferrous powder, which has the mixture ratio, holding 2 hours at 1200℃in hydrogen. Then, hold the presintering test samble 1.5 hours at 1125℃under vacuum, being pre-sintered with powder metallurgy method and infiltrating copper by vacuum infiltration method. (3) Bending strength of the 3D-Meshy SiC/Cu-Fe composite material on Fe2O3 membrane reached 426. 1MPa, compression strength reached 410.2MPa, which were better than the 3D-Meshy SiC/Cu-Fe composite material on Al2O3, ZrO2 or MgO membrane. (4) Interface reaction existed during the sintering procedure of the new type 3D-Meshy SiC/Cu-Fe Composite Material, however, the new type 3D-Meshy SiC/Cu-Fe Composite Material on different metal oxide films have the different size of interface reaction. The 3D-Meshy SiC/Cu-Fe composite material on Fe2O3 membrane, which size of interface reaction was narrower. (5) The results of friction test for the moment of inertia showed that: with the increase of the rotational speed, the average friction coefficient reduced while the braeking time increased. With the increase of the pressure, the average friction coefficient, braking time both reduced. In addition, Fe2O3 membrane influenced more than ZrO2 membrane to the 3D-Meshy SiC/Cu-Fe composite material in some ways, just like the average friction coefficient, the braeking tim and wearing capacity and so on.

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