Coatings for High-Temperature Structural Materials Trends and Opportunities (1996) / Chapter Skim
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C SURVEY OF NONDESTRUCTIVE EVALUATION METHODS
C SURVEY OF NONDESTRUCTIVE EVALUATION METHODS
Pages 67-71
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From page 67... ...
NDE methods form families of techniques classified by either source-detection method or source/specimen interaction. Table 6-1 lists some of the primary NDE methods that have been used for coating inspection grouped primarily by detection method.
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From page 68... ...
THERMAL METHODS Thermal imaging methods use a source of energy to create a temperature field in a specimen and a detection method to monitor the temperature changes. The information obtained depends on the initial source distribution, the subsequent thermal diffusion, and the detection method used.
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From page 69... ...
As in the case of thermal imaging, the depth sampling provided by the skin depth, and especially its frequency dependence, allows buried regions of a specimen to be examined in a single-sided measurement. Eddycurrent methods can determine the electrical properties of individual layers in multilayer conducting materials and the 69 properties of conducting regions below a dielectric layer.
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From page 70... ...
The energy absorbed from an X-ray source of variable energy increases near the characteristic wavelength of specific elements. This increased heat flux into the sample changes the volume and COATINGS FOR HIGH-TEMPERATURE STRUCTURAL MATERIALS surface temperature of the sample.
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From page 71... ...
1991. Temperature evolution of plasma sprayed niobium particles impacting on a substrate.
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