Microstructure of friction surface developed on carbon fibre reinforced carbon-silicon carbide (C_f/C-SiC)

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• 作者：Yuan Wang ; Houzheng Wu ; ^{h.wu2@lboro.ac.uk}
• 关键词：Composites ; Electron microscopy ; Surfaces ; SiC ; Carbon fibre
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：32
• 期：12
• 页码：3509-3519
• 全文大小：2789 K

文摘

We have used TEM to study the microstructure of friction surface of carbon fibre/carbon-silicon carbide composites brake discs after multi braking stop by using organic pads. A friction surface layer was developed consistently on the top of Si regions of the composites, but inconsistently on that of SiC and C. Inside the layer, amorphous silicon/silicon oxides appeared extensively with various non-metallic and metallic crystallites dispersed inside with sizes ranging from a few nanometers to several microns. A coherent interface between the friction layer and the composite surface was established under the braking conditions, whilst its sustainability varied notably in SiC and C regions. Microcracking near the friction surface appeared in SiC and C_f/C regions largely due to the extensive ductile deformation of SiC and weak interfaces between C and C_f. Material joining mechanisms were discussed to enlighten the friction transfer layer development on the surface of the composite discs.