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Short carbon fibre; mechanical properties; fracture behaviour; geopolymer; fibre content; composite.

Geopolymer matrix composites reinforced with different volume fractions of short carbon fibres (C_f/geopolymer composites) were prepared and the mechanical properties, fracture behaviour and microstructure of as-prepared composites were studied and correlated with fibre content. The results show that short carbon fibres have a great strengthening and toughening effect at low volume percentages of fibres (3.5 and 4.5 vol.%). With the increase of fibre content, the strengthening and toughening effect of short carbon fibres reduce, possibly due to fibre damage, formation of high shear stresses at intersect between fibres and strong interface cohesion of fibre/matrix under higher forming pressure. The property improvements are primarily based on the network structure of short carbon fibre preform and the predominant strengthening and toughening mechanisms are attributed to the apparent fibre bridging and pulling-out effect.

Tiesong Lin¹ Dechang Jia¹ Meirong Wang¹ Peigang He¹ Defu Liang¹

1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China

Published

February 2009

Manuscript received

2 June 2008