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Flow-Tube Oxidation Experiments on the Carbon Preform of a Phenolic-Impregnated Carbon Ablator
Journal of Thermophysics and Heat Transfer (2014)
  • Francesco Panerai, University of Kentucky
  • Alexandre Martin, University of Kentucky
  • Nagi N. Mansour, NASA Ames Research Center
  • Steven A. Sepka
  • Jean Lachaud, University of California, Santa Cruz
Abstract

Oxidation experiments on the carbon preform of a phenolic-impregnated carbon ablator were performed in a flow-tube reactor facility, at temperatures between 700 and 1300 K, under dry air gas at pressures between 1.6×103 and 6.0×104  Pa. Mass loss, volumetric recession and density changes were measured at different test conditions. An analysis of the diffusion/reaction competition within the porous material, based on the Thiele number, allows identification of low temperature and low-pressure conditions to be dominated by in-depth volume oxidation. Experiments above 1000 K were found at transition conditions, where diffusion and reaction occur at similar scales. The microscopic oxidation behavior of the fibers was characterized by scanning electron microscopy and energy dispersive x-ray analysis. The material was found to oxidize at specific sites, forming a pitting pattern distributed over the surface of the fibers. Calcium- and oxygen-rich residues from the oxidation reactions were observed at several locations.

Keywords
  • Flow-Tube Oxidation,
  • Phenolic-Impregnated Carbon Ablator
Disciplines
Publication Date
2014
Citation Information
Francesco Panerai, Alexandre Martin, Nagi N. Mansour, Steven A. Sepka, et al.. "Flow-Tube Oxidation Experiments on the Carbon Preform of a Phenolic-Impregnated Carbon Ablator" Journal of Thermophysics and Heat Transfer Vol. 28 Iss. 2 (2014)
Available at: http://works.bepress.com/alexandre_martin/33/