Accession Number : AD0427346


Title :   STRUCTURAL CHANGES IN PYROLYTIC GRAPHITE AT ELEVATED TEMPERATURES


Corporate Author : AEROSPACE CORP EL SEGUNDO CA


Personal Author(s) : Richardson, J H ; Zehms, E H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/427346.pdf


Report Date : 01 Dec 1963


Pagination or Media Count : 34


Abstract : Gross and unit cell dimensional changes of pyrolytic graphite were measured as a function of heat-treatment times between 15 seconds and 10 minutes at temperatures from 2600 to 3000 C. These changes were also measured for 4-hour heat treatments in the same temperature range. No incubation period for these changes was noted above 2600 C. The effects of these changes in rocket nozzle and reentry configurations are discussed.


Descriptors :   *GRAPHITE , *HEAT SHIELDS , ABLATION , CREEP , EMISSIVITY , EROSION , IRREVERSIBLE PROCESSES , PYROMETERS , ROCKET NOZZLES , X RAY DIFFRACTION


Subject Categories : Geology, Geochemistry and Mineralogy


Distribution Statement : APPROVED FOR PUBLIC RELEASE