Effects of coating treatment on mechanical properties of carbon fibres and reinforced silicon carbide composites

Abstract

Three-dimensionally braided carbon fibre reinforced SiC matrix composites have been fabricated and the effects of coating treatment on the mechanical properties have been investigated. It has been found that pyrocarbon coating can improve the strength of the heat treated carbon fibres. When the coating thickness was y0 . 5 mm, the composites had better mechanical properties: a flexural strength of 643 MPa and a fracture toughness of 17 . 9 MPa m 1/2 . The composites also exhibited a toughening fracture mode.MST/4837