Effect of heat treatment on crystal structure and wear performance of carbon-carbon composites

Dale E. Wittmer, Soydan Ozcan, Milan Krkroska, Peter Filip

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The processing temperature of a carbon-carbon (C/C) composite controls the extent of graphitization and crystal size. Often times the processing temperatures in industrial furnaces with graphite hot zones are not known with great accuracy because of the changes in emissivity with increasing temperature. Temperatures are controlled by pyrometers and the pyrometers are calibrated to be accurate only for a very narrow temperature range. The wear of graphite is also known to be dependent on many factors, of which crystallize size and extend of graphitization are two of those factors. In order to study the effect of heat treatment on the crystal structure and wear performance of commercial C/C composites, composite samples were heat treated at temperatures ranging from 1800°C to 2400°C in Ar. Following heat treating, a sample was ground from the surface of each sample and mixed with 99.99% pure Ni powder as an internal standard. X-ray diffraction was performed using the major peaks for graphite (the (002) for 2H) and Ni (111). The full-width half maximum for each diffraction peak was used to determine the crystal size, and the peak shift for the graphite (002) was determined based on the Ni internal standard. The corrected d spacing for the (002) plane were then determined. The sub-scale dynamometer at the Center for Advanced Friction (CAFS) studies was used to perform wear testing of each of the carbon-carbon composites, following heat treatment. The results were then compared with the crystallographic information obtained from X-ray diffraction and TEM.

Original languageEnglish
Title of host publicationMechanical Properties and Performance of Engineering Ceramics and Composites II - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
Pages665-675
Number of pages11
Edition2
StatePublished - 2006
Externally publishedYes
EventMechanical Properties and Performance of Engineering Ceramics and Composites Symposium - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: Jan 22 2006Jan 27 2006

Publication series

NameCeramic Engineering and Science Proceedings
Number2
Volume27
ISSN (Print)0196-6219

Conference

ConferenceMechanical Properties and Performance of Engineering Ceramics and Composites Symposium - 30th International Conference on Advanced Ceramics and Composites
Country/TerritoryUnited States
CityCocoa Beach, FL
Period01/22/0601/27/06

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