Effect of alumina coating and extrusion deformation on microstructures and thermal properties of short carbon fibre–Al composites

Bulletin of Materials Science

关键词: Carbon fibre;    aluminium composite;    alumina coating;    extrusion;    thermal properties.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Short carbon fibres were coated with alumina by sol–gel process. Uncoated and alumina-coated short carbonfibre–Al composites were fabricated by gas pressure infiltration process. The effects of alumina coating and extrusiondeformation on microstructures and thermal properties of the composites were studied. The results showthat alumina coatingis effective to improve the quality of the short carbon fibre preform as well as act as diffusion barrier to impede interfacialharmful chemical reactions between aluminium and short carbon fibres, which would increase the thermal properties ofthe composites. Extrusion deformation can orient the carbon fibres to the extrusion direction to improve their degree oforientation, meanwhile decreasing their aspect ratio. Extrusion deformation has a beneficial effect on the thermal conductivityof the composites. However, its effect on coefficient of thermal expansion of the composites is small because the effects ofthe improvement in degree of orientation and the decrease of aspect ratio tend to cancel each other somewhat.

【 授权许可】

CC BY