THE EVALUATION OF HIGH TEMPERATURE MATERIALS SYSTEMS WITH AN ARC-PLASMA-JET.
Rept. for Feb 61-Jan 62,
DAYTON UNIV OHIO RESEARCH INST
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A small arc-plasma-jet was suitably modified and utilized for the evaluation and screening of high temperature materials at heat flux levels ranging from 10 to 500 Btusq. ft-sec. A standard evaluation procedure was employedto characterize a number of systems representing ablating, insulating, and heat sink type materials. Results of these tests are presented in terms of weight loss, density change, depth and volume of erosion, and front and back surface temperatures. A metallographic analysis of coating failures in the XLR-99 thrust chamber of the X-15 research aircraft and the subsequent development of a thermal shock test with the plasma-jet for sprayed ceramic coatings are discussed. The results of an extensive evaluation of protective coatings and the field test verification of these results are presented. Preliminary tests leading to the development of a dynamic oxidation test are discussed and the results of arc-plasma-jet tests of five silicide coatings on Mo-12 Ti are presented. Author