Title: THERMAL WAVE IMAGING OF INDENTATIONS IN WC COATED WITH CVD DIAMOND

Abstract:
Photothermal radiometry has been used to obtain thermal wave images in the vicinity of indentations in WC-6%Ni coated with chemical vapor deposited (CVD) diamond. The magnitude and phase profiles of the thermal wave signal are consistent with a one dimensional thermal wave theory that assumes: 1 ) an air gap extending well beyond the visibly observable indented region; 2) a thermal resistance interface between the diamond film and the substrate over the entire coated surface. The theory estimates that the air gap decreases as the distance from the indented region increases. Air gap variations of tens of nanometers appear to be easily detectable.
(Ref. SXVIII-046-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
Buying the Symposium Proceedings from the American Ceramic Society.