Extraction of Properties of Condensed Outgassed Species by Thermogravimetric Analysis

摘要

This paper describes progress in the development of a new contamination prediction code, The Aerospace Satellite Contamination Model Evaluator (ASCME). This paper provides fitted parameters for Langmuir evaporation models of contaminants from 15 materials based upon kinetic testing according to the ASTM E1559-93 procedure. It is shown that the evaporation rate parameters, p_1 and P_2, derived from the E1559 TGA testing do not always agree with corresponding parameters calculated from published vapor pressure data~(10). The uncertainty in extracting p_1 and p_2 parameters due to experimental scatter is estimated to be about +- 5.6 % and +-4 %, respectively. It is demonstrated that m desorption profiles can vary significantly, depending upon the originating source material. It is shown that evaporation rate parameters depend strongly on the test method, static vs. kinetic.