Flow-tube oxidation experiments on the carbon preform of PICA

Francesco Panerai, Alexandre Martin, Nagi N. Mansour, Steven A. Sepka, Jean Lachaud

Research output: Contribution to conferencePaper

Abstract

Oxidation experiments on the carbon preform of a phenolic-impregnated carbon ablator were performed in the NASA Ames flow-tube reactor facility, at temperatures between 700 and 1300 K, under dry air gas at pressures between 103 and 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, allowed us to identify 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 fibers' surface. Calcium- and oxygen-rich residues from the oxidation reactions were observed at several locations.

Original languageEnglish (US)
DOIs
StatePublished - 2013
Event44th AIAA Thermophysics Conference - San Diego, CA, United States
Duration: Jun 24 2013Jun 27 2013

Other

Other44th AIAA Thermophysics Conference
CountryUnited States
CitySan Diego, CA
Period6/24/136/27/13

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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    Panerai, F., Martin, A., Mansour, N. N., Sepka, S. A., & Lachaud, J. (2013). Flow-tube oxidation experiments on the carbon preform of PICA. Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States. https://doi.org/10.2514/6.2013-2769