Volume 10, Issue 6 (November 1982)
High Temperature Cyclic Oxidation Furnace Testing at NASA Lewis Research Center
A standardized method of testing the cyclic oxidation resistance of various alloys in static air up to 1200°C has been developed and routinely used at the National Aeronautics and Space Administration (NASA) Lewis Research Center. Test specimens are automatically raised and lowered into a resistance wound furnace for a series of fixed-interval heating and cooling cycles. Spall catchers collect the accumulated spall from each specimen. The specimens are weighed intermittently to generate specific weight change with time data. At various test times the specimens and the accumulated spall are analyzed by X-ray diffraction. A computer program is used to print out the specific weight change versus time data and the X-ray data in tabular form and to plot the specific weight change versus time data in a publishable format. The data are also organized and indexed. So far several hundred iron-, nickel-, and cobalt-base alloys have been tested using this basic procedure and will form the basis of a series of cyclic oxidation handbooks to be published by NASA. Such specific weight change/time data have been used to estimate the oxidative metal consumption by several computer modeling techniques both to rank alloys and to estimate life.