Accession Number : ADA308235

Title :   High Thermal Conductivity Carbon/Carbon Composites.

Descriptive Note : Rept. for 1 Oct 94-30 Sep 95,

Corporate Author : CLEMSON UNIV SC DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Edie, Dan D.

PDF Url : ADA308235

Report Date : 30 SEP 1995

Pagination or Media Count : 9

Abstract : The objective of this project was to develop a lowcost, high thermal conductivity carbon/carbon composite with a mesophase pitch-based matrix. A low-cost, continuous powder coating process was developed which can produce a flexible pre-impregnated pitch-based towpreg. A combination of a pressure-carbonization technique and heat treatment of the mesophase pitch was utilized to enhance composite properties by increasing the composite density. Three different fibers, T300 PAN-based, P55 pitch-based, and an experimental high thermal conductivity mesophase pitch-based, were incorporated as the filler phase in the composites. The thermal conductivity of the graphitized T300/AR-120 and the P55/AR-120 composites was 80.5 and 135.5 W/m-K, respectively. The composites reinforced with the experimental ribbon fibers exhibited 3-D anisotropy, with a thermal conductivity, transverse to the fibers, of 213.5 W/m-K, higher than that parallel to the fibers, 145 W/m-K. These results indicate that fiber shape can affect matrix properties in carbon/carbon composites. Using finite element methods, a model was developed to predict the effect of specific material variables, such as fiber fraction, fiber structure, matrix structure, fiber/matrix interface, and void fraction, on the thermal conductivity of the composite. p2

Descriptors :   *CARBON CARBON COMPOSITES, *THERMAL CONDUCTIVITY, DENSITY, FIBERS, MATERIALS, POWDERS, FINITE ELEMENT ANALYSIS, ACRYLONITRILE POLYMERS, PHASE, HEAT TREATMENT, VARIABLES, COATINGS, PARALLEL ORIENTATION, GRAPHITED MATERIALS, CONTINUOUS PROCESSING, TRANSVERSE, FILLERS.

Subject Categories : Laminates and Composite Materials
      Organic Chemistry
      Polymer Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE