Publisher's Synopsis
Devitrification (nucleation and growth of cristobalite) were investigated in the LI-0042 coating used for the space shuttle surface insulation. Excessive devitrification was found to be associated with the silicon carbide (SiC) constituent in the coating. Test results show that significant devitrification occurred only when SiC was present in the coating and when the thermal-exposure atmosphere was oxidizing. Ransone, P. O. Langley Research Center NASA-TM-78755, L-12069 RTOP 506-16-43-11
