Erosive Effects of Various Pure and Combustion Generated Gases on Metals

摘要

The erosive effect of nitrogen-oxygen mixtures on 4340 steel nozzles has been studied using gas pressure transients produced by a ballistic compressor. Attention has been directed at threshold phenomena on both uncoated and coated specimens. Samples have been studied using scanning electron microscopy, Auger spectroscopy, mass loss and light microscopic methods. In all cases mass loss was associated with a melting of the nozzle material and material removal by ablation. An attempt has been made to produce some resistive thin film gauges to study the time-temperature history of a simulated eroding surface. Preliminary experimental data is presented. (Author)