Thermal fatigue on ceramic coated cutting tips by acoustic emission
The nondestructive evaluation of the structural integrity of ceramic coatings presents a relevant importance as it characterizes the behaviour and durability of the cutting tip. A method is proposed for evaluating the quality by means of acoustic emission on WC-Co tips (1x1 cm) over which a thin film (8 µm) of titanium nitride (TiN) and carbon nitride (CN) was acquired using a physical vapour deposition (PVD) technique. The tips with and without defects have been subjected to thermal shock and their dynamic response has been investigated through acoustic emission. The response given by the tips presenting a good coating and the one presenting different kinds of imperfections can be utilized as a first attempt to discriminate, in a semi-quantitative way, the quality of the coating itself.
Bibliographic Reference: Paper presented: Colloque International L'evolution des Materiaux pour Outils de Coupe, Saint Etienne (FR), November 13-14, 1996
Availability: Available from (1) as Paper EN 40227 ORA
Record Number: 199710010 / Last updated on: 1997-02-03
Original language: en
Available languages: en