Deposition and characterization of (Ti, Al)N coatings deposited by thermal LPCVD in an industrial reactor

Florent Uny (1) , Sofiane Achache (1) , Salim Lamri (2) , Jaafar Ghanbaja (3) , Evelyne Fischer (4) , Michel Pons (4) , Elisabeth Blanquet (4) , Frédéric Schuster (1, 5) , Frédéric Sanchette (1)

1 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée
2 Lisi Aerospace
3 IJL - Institut Jean Lamour
4 SIMaP - Science et Ingénierie des Matériaux et Procédés
5 CEA - Commissariat à l'énergie atomique et aux énergies alternatives

The increased need for protecting cutting tools has led to the development of more and more efficient coatings. Ti-Al-N is one of the most studied systems in the hard coating industry due to the high hardness and good oxidation resistance of Ti1−xAlxN coatings. The development of LPCVD processes has led to the discovery of new microstructures and morphologies. In this study, we discuss the microstructural and morphological changes caused by varying the aluminum content in films deposited by low pressure thermal CVD in an industrial reactor at low carrier gas flow and relatively high pressure (>4 kPa). Coatings were characterized using FE-SEM, XRD and TEM analysis, revealing the growth of nanolamellae with modulated Al and Ti contents for the lowest Al containing coatings. The coatings with the highest Al contents were also found to show particular cube-shaped grains with a micromodulation of composition. Experimental Al content values are higher than the calculated one and their evolutions with the AlCl3/(AlCl3 + TiCl4) molar ratio are similar. The hardness and oxidation resistance were characterized and compared with available data in literature. Higher hardness is obtained for coatings having an Al content up to x = 0.65 and a hardness drop is found for higher Al contents. The oxidation resistance of the coatings rises continuously with an increasing Al content.

Mots clés: PCVD; Ti1−xAlxN; Oxidation resistance; Hardness; Morphology; Nanolamellae

Domaines: Matériaux

Florent Uny, Sofiane Achache, Salim Lamri, Jaafar Ghanbaja, Evelyne Fischer, et al.. Deposition and characterization of (Ti, Al)N coatings deposited by thermal LPCVD in an industrial reactor. Surface and Coatings Technology, 2019, 358, pp.923-933. ⟨10.1016/j.surfcoat.2018.12.014⟩. ⟨hal-02119534⟩