Mesophase Behavior Fundamental to the Processing of Carbon-Carbon Composites.
Abstract
The behavior of the carbonaceous mesophase under conditions of composite fabrication has been investigated to understand (1) the formation of microstructure within the fiber matrix, (2) the mechanisms that determine process efficiency, and (3) how the properties of the matrix are affected by carbonizing and graphitizing heat treatments. Experimental work in FY 85 focused on two concepts to introduce new approaches to fabrication: pressure cycling, while the mesophase is still plastic, to attain more complete impregnation; and oxidation stabilization, to circumvent the inefficiencies of thermal hardening caused by blowout of the mesophase matrix by gaseous pyrolysis products. Other experimental work included observations of the microstructural mechanisms operating in the mesophase matrix during heat treatment beyond the point of mesophase hardening. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 03, 1986
- Accession Number
- ADA301814
Entities
People
- J. L. White
- P. M. Sheaffer
Organizations
- The Aerospace Corporation