Graphite Ablation in High-Pressure Environments
MDDONNELL DOUGLAS ASTRONAUTICS CO-WEST SANTA MONICA CA
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A performance analysis of the thermochemicalthermomechanical 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.
- Ceramics, Refractories and Glass