Thermal Stability Assessment by Acoustic Emission on Ceramic Thin Film
The growing attention to new materials for industrial cutting tools and new coating techniques aims to improve and optimize productivity of tool machines and reliability of production processes. Physical vapour deposition (PVD) and chemical vapour deposition (CVD) coating technologies are favoured for their technological performances. The thinness of the films excludes the most common nondestructive characterization techniques and brings together the need to reproduce in a believable way the service conditions. The first aim of the thin film is to improve the tribological property of the tool during use and thus increasing its life. The film adhesion loss, due to the different thermal coefficients and to the thermal shock, lead to a reduction of the tool efficiency. A first attempt to evaluate the quality of the thin film is to detect its progressive deterioration under thermal stress conditions. In this work acoustic emission (AE) technique is applied to evaluate the thermal stability of the coatings. AE shows that crack propagation can occur even at low temperature if coating quality is very poor and can help the quality controller to isolate and discard the defective piece.
Bibliographic Reference: Paper presented: Twenty-Second European Conference on Acoustic Testing Emission, Aberdeen (GB), May 29-31, 1996
Availability: Available from (1) as Paper EN 39756 ORA
Record Number: 199610673 / Last updated on: 1996-06-21
Original language: en
Available languages: en