A State-of-the-ART Survey of Methods Being Used for the Evaluation of Coatings for Super Alloys and Refractory Metals

摘要

The report is based on a survey conducted in 1964 in the NATO countries on behalf of the Structures and Materials Panel of AGARD. The Report describes evaluation methods that came to the author's attention during the survey, and gives some typical results by the methods. As much as possible, the report excludes reference to reports that normally are given restricted distribution, and includes references to literature that is freely available. The survey indicated that methods for the determination of physical and mechanical properties were relatively well defined, after provision was made for testing at high temperatures. By contrast, widely different methods were being used to determine resistance to corrosion, to erosion, to thermal shock and to thermal fatigue: the various methods are described in some detail. Usually one or more of oxidation resistance, resistance to erosion by hot gases and the effect of stress were evaluated simultaneously with resistance to thermal fatigue. The differences in evaluation procedures appeared to reflect differences in opinion concerning what was wanted from a test. This Report is the result of a NATO Survey of Techniques in several nations. (Author)