Graphite Ablation in High-Pressure Environments

Abstract

A performance analysis of the thermochemical/thermomechanical behavior of graphite is made extending present analysis procedures to include the allotropic features of bulk graphite. The analysis comprises a complete definition of graphite sublimation, and formulates a model for mechanical erosion based on erosion of individual grains. Newly computed thermodynamic functions for the polyatomic ring and chain carbon-molecules are used to define the sublimation regime; the probable uncertainty in these functions on computed vapor pressure and mass transfer is evaluated. Removal of graphite filler grains owing to preferential erosion of the binder matrix is described; numerical results are presented for the fraction of solid material mechanically eroded from the surface. Models fabricated from graphites encompassing fine-to coarse-grain filler particles were tested over a wide environmental spectrum.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1969
Accession Number
AD0719722

Entities

People

  • F. I. Clayton
  • J. E. Wuerer
  • K. M. Kratsch
  • M. R. Martinez
  • R. B. Greene

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ablation
  • Ablative Materials
  • Boundary Layer
  • Chemical Elements
  • Chemical Reactions
  • Chemistry
  • Energy Transfer
  • Graphitic Materials
  • Heat Energy
  • Heat Of Formation
  • Heat Transfer
  • Mass Transfer
  • Measurement
  • Test Facilities
  • Thermodynamic Properties
  • Thermodynamics
  • Vapor Pressure

Readers

  • Combustion science or combustion engineering.
  • Computational Fluid Dynamics (CFD)
  • Surface Engineering/Surface Coating Technology.