EFFECTS OF COATINGS AND HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF COATED CARBON FIBRE

Systematic study has been made on the effect of heat treatment on the mechanical properties of carbon fibre with Ni coating,SiC coatingand SiC-Ni duplex coating.It is shown that tensile strength of the fibre increases with the increasing of thickness of SiC coating.The fracture way of the fibre coated with SiC is pull-out.The strength of SiGcoated fibre does not decrease after heat treatment.The strength of SiC-Ni-coated fibre decreases slowly during heat treatment.The strength of Ni-coated fibre decreases quickly.The reason that the strength of the fibre decreases and fracture mechanism of the coated fibre are analysed.