A Poulon Quintin
Université de Bordeaux, France
Title: Tantalum nitride structure selection and carbon diffusion
Biography
Biography: A Poulon Quintin
Abstract
Because of their unique electrical, mechanical and chemical properties, transition metal nitride thin films have attracted considerable attention in recent years. In particular, tantalum nitride (TaN) thin films are very promising materials due to their high thermal stability, hardness, chemical inertness and conductivity. TaN exhibits two crystallographic structures: Hexagonal and cubic. An accurate control of reactive magnetron sputtering deposition conditions allows us to isolate both phases. TaN thin films can be used as buffer layers and diffusion barriers against cobalt diffusion during diamond deposition on sintered WC-Co cutting tools. Its function is also supposed to control carbon diffusion phenomenon during the process in order to enhance diamond nucleation. In this study, we gauge the potentiality of the metastable face-centered-cubic and the stable hexagonal TaN phases on diamond nucleation. The potentiality of TaN to be carburized during the CVD diamond deposit process is discussed as the carbon diffusion phenomenon. The understanding of the specific responses of each TaN phase during the CVD process opens up new horizons for diamond coating performances.
Figure 1: Evolution of the hexagonal TaN weight ratio as a function of target power density (reactive magnetron sputtering).
Recent Publications
1. B Le Gloannec, O Doyen, C Pouvreau, A Doghri, A Poulon Quintin (2016) Numerical simulation of upset resistance welding in rod to tube configuration: Required conditions and contact resistances determination. Journal of material processing technology 238:409–422.
2. M Cheviot, M Gouné, A Poulon Quintin (2015) Monitoring tantalum nitride thin film structure by reactive RF magnetron sputtering: Influence of processing parameters. Surface Coating and Technology 284:192–197.
3. A Poulon Quintin, C Faure, L Teulé Gay and J P Manaud (2015) Innovative solution to improve multilayer nano crystalline diamond coating adhesion. Applied Surface Science 331:27-34.
4. D Sidane, E Bousquet, O Devos, M Puiggali, M Touzet, V Vivier, A Poulon Quintin (2015) Local electrochemical study of friction stir welded aluminum alloy assembly. Journal of Electroanalytical Chemistry 737:206-211.
5. C Faure, A Hodroj, L Teulé Gay, J P Manaud and A Poulon Quintin (2013) Mechanisms of time-modulated polarized NCD growth. Surface and Coating Technology 222:97-103.
