EFFECT OF HEAT TREATMENT ON THERMAL PROPERTIES OF PITCH-BASED AND PAN-BASED CARBON-CARBON COMPOSITES
- Southern Illinois University
- ORNL
Thermal properties of two directional (2D) pitch-based carbon fiber with charred resin and three directional (3D) PAN-based carbon fiber with CVI carbon matrix C/C composite were investigated for non-heat treated (NHT) and heat treated (HT) materials through the thickness (z-direction). Heat treatment was performed at 1800, 2100 and 2400 oC for 1-hr in inert argon atmosphere. Thermal diffusivity, heat capacity and bulk density were measured to calculate thermal conductivity. Thermal diffusivity and conductivity was the highest for 3D C/C heat treated at maximum temperature with non-heat treated one exhibiting the lowest one. Similarly, 2D C/C heat treated at maximum temperature exhibited the highest thermal diffusivity and thermal conductivity. Polarized light microscopy (PLM) images of HTT C/C show a progressive improvement in microstructure when compared to NHT C/C. However, HTT 2D and 3D C/C composites exhibited extensive shrinkage of charred resin and CVI carbon matrix, respectively, from fibers resulting in intra and inter-bundles cracking when compared to NHT one. Raman spectroscopy and XRD results of NHT and HTT C/C indicated increased ordering of structure. A progressive improvement in thermal properties was observed with increased heat treatment temperatures.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1025405
- Resource Relation:
- Conference: 35th International Conference and Exposition on Advanced Ceramics and Composites (ICACC 11), Daytona Beach, FL, USA, 20110123, 20110128
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON
BULK DENSITY
CARBON
CARBON FIBERS
CERAMICS
FIBERS
HEAT TREATMENTS
MICROSCOPY
MICROSTRUCTURE
RAMAN SPECTROSCOPY
RESINS
SHRINKAGE
SPECIFIC HEAT
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
THICKNESS
X-RAY DIFFRACTION
Thermal Diffusivity
Thermal Conductivity
Thermal Expansion
Carbon-carbon composites