摘要
The effect of pyrocarbon(PyC) concentration on the thermal physical and mechanical properties of quasi 3dimensional carbon fiber fabrics reinforced pitch-based carbon matrix composites was investigated.As the PyC concen-tration increased from 0 to 22.9vol.%,the tensile strength of pitch-based C/C(Carbon/Carbon) composites initially in-creased and then decreased,so was the tensile modulus.The coefficients of thermal expansion(CTE) were in the sequence of 10.2vol.%<0<22.9vol.%in Z direction.Under the same temperature conditions,PyC layer had a positive-going influence on the TC of the C/C composite,the composite with 22.9vol.%PyC concentrations possessed the highest TC value.The thermal shock resistance of the material with 10.2vol.%PyC concentrations showed the highest value.It is logical to conclude that by adding the a suitable PyC concentration into the carbon fabrics,thermo- mechanical properties,the major concerns for the safety design of load-bearing structural parts,can be tailored,which increase the reliability of pitch-based C/C composites as a structure unit.
The effect of pyrocarbon(PyC) concentration on the thermal physical and mechanical properties of quasi 3dimensional carbon fiber fabrics reinforced pitch-based carbon matrix composites was investigated.As the PyC concen-tration increased from 0 to 22.9vol.%,the tensile strength of pitch-based C/C(Carbon/Carbon) composites initially in-creased and then decreased,so was the tensile modulus.The coefficients of thermal expansion(CTE) were in the sequence of 10.2vol.%<0<22.9vol.%in Z direction.Under the same temperature conditions,PyC layer had a positive-going influence on the TC of the C/C composite,the composite with 22.9vol.%PyC concentrations possessed the highest TC value.The thermal shock resistance of the material with 10.2vol.%PyC concentrations showed the highest value.It is logical to conclude that by adding the a suitable PyC concentration into the carbon fabrics,thermo- mechanical properties,the major concerns for the safety design of load-bearing structural parts,can be tailored,which increase the reliability of pitch-based C/C composites as a structure unit.
