Coating of a stainless steel tube-wall catalytic reactor with thermally treated polysiloxane thick films

Laure Guillou (1, 2) , P. Supiot (3) , V. Le Courtois (1, 2)

1 LCL - Laboratoire de catalyse de Lille - UMR 8010
2 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
3 GéPIFRéM - Laboratoire de Génie des Procédés d'Interactions Fluides Réactifs-Matériaux - EA 3571

Organosilicon films were grafted over stainless steel substrates thanks to a plasma assisted chemical vapor deposition process. Thicknesses up to 10μm were developed. The organosilicon films were then thermally treated under air and the influence of calcinations conditions was investigated by infrared spectroscopy, Raman microscopy and XPS. On all films, it appears that the structure varies according to the thermal treatment parameters. Indeed the surface composition appears to be SiO1.8 which might represent a structure close to amorphous silica whereas the deepest layers retain a variable organic nature. Under the severer treatments, the nature of the deposit evolves toward a low reticulated glass-like silicon oxide but cannot be related to an amorphous silica structure. At 1273K the steel remains coated and hidden despite visible but non penetrating cracks of the upper layer of the physical barrier.

Mots clés: PACVD; TDMS; stainless steel; surface passivity

Domaines: Matériaux; Plasmas

Laure Guillou, P. Supiot, V. Le Courtois. Coating of a stainless steel tube-wall catalytic reactor with thermally treated polysiloxane thick films. 7th World Congress of Chemical Engineering, Jul 2005, Glasgow, France. pp.CD-Rom of Extended Abstracts. ⟨hal-00141636⟩