The scratch test - Different critical load determination techniquesDifferent critical load determination techniques such as microscopy, acoustic emission, normal, tangential, and lateral forces used for scratch test evaluation of complex or multilayer coatings are investigated. The applicability of the scratch test to newly developed coating techniques, systems, and applications is discussed. Among the methods based on the use of a physical measurement, acoustic emission detection is the most effective. The dynamics ratio between the signals below and above the critical load for the acoustic emission (much greater than 100) is well above that obtained with the normal, tangential, and lateral forces. The present commercial instruments are limited in load application performance. A scratch tester able to apply accurate loads as low as 0.01 N would probably overcome most of the actual limitations and would be expected to extend the scratch testing technique to different application fields such as optics and microelectronics.
Document ID
19890066907
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sekler, J. (Swiss Center for Electronics and Microtechnology Inc., Neuchatel, Switzerland)
Hintermann, H. E. (Swiss Centre for Electronics and Microtechnology, Inc. Neuchatel, Switzerland)
Steinmann, P. A. (NASA Lewis Research Center Cleveland, OH; Swiss Centre for Electronics and Microtechnology, Inc., Neuchatel, Switzerland)