Project: THEMPO2

THEMPO 2 (Traitements HybridEs de substrats Métalliques élaborés par voie classique et par métallurgie des POudres 2)

Project accepted for funding by the Bourgogne Franche-Comté Régional Council
Call for Proposals 2022 (Envergure)



In order to improve wear and oxidation resistance, protective layers could be deposited on parts. In the case of mechanical applications, theses layers have to strongly adhere to the surface to ensure their protective function.
The coatings used in mechanical applications are mostly nitride compounds (TiN, CrN, …), or carbides (TiC, TiCN, …), PVD deposited. For many applications, coating adhesion could be improved.
THEMPO2 (Traitements HybridEs de substrats Métalliques élaborés par voie classique et par métallurgie de POudres 2) is next to THEMPO project, which consists in the combination of two surface treatment processes. This kind of hybrid treatment involves first a metallic PVD coating (Ti, Cr, …) and then a thermochemical treatment. The aim of the thermochemical treatment is: (i) the conversion of the metallic PVD layer into a nitride or a carbide compound, and (ii): the interdiffusion between the PVD layer and the underlying substrate (Pure iron and 316L stainless steel in this project), in order to ensure the adhesion of the coating. During the thermochemical treatment, intermetallic phases could appear at the PVD layer/substrate interface. Their influence on the adhesion of the final compound layer will be analysed. Besides, it will be interesting to compare Tic or CrN PVD layers’ properties with those of pure cemented Ti coating and of pure nitrided Cr coating. Indeed, we expect a gradient of the layers properties thanks to the intermettalic obtained after the thermochemical treatment of pure metallic layers.
Another aspect of the project is the influence of the microstructure (especially the grain size) of the substrate on the adhesion of the surface layer. Powder metallurgy by SPS (Spark Plasma Sintering) allows an easy control of the microstructure. This process is the most convenient way to analyse its influence, and compare with “classical” forged steel substrates.
During the THEMPO project, Interdiffusion between substrates and PVD layer have been highly explored through diffusion couple experiments between Ti and pure iron/316L. The THEMPO2 project will mainly focus on thermochemical treatments of the metallic PVD layers and the influence of the substrate microstructure on diffusion phenomena.
THEMPO 2 is the result of the collaboration between the LaBoMaP (Arts et Métiers Cluny, thermochemical treatments and PVD coatings) and ICB (University of Burgundy, powder metallurgy)


Project Coordinator:
Corinne NOUVEAU, Associate Professor at Arts et Métiers, LaBoMaP

Project Partners:
Maria Rosa ARDIGO-BESNARD, Associate Professor at University of Burgundy, ICB
Frédéric BERNARD, Full Professor at Arts et Métiers, University of Burgundy, ICB
Aurélien BESNARD, Associate Professor at Arts et Métiers, LaBoMaP - Arts et Métiers
Florian BUSSIERE, Engineer at University of Burgundy, ICB
Dominique COTTON, Associate Professor at Arts et Métiers, LaBoMaP - Arts et Métiers

PhD student:
Loïc CHOSSEMIER,  October 1st 2022 - ...



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