Preparation and characterization of oxidation-resistant black glass (SiCO) coatings obtained by hydrosilylation of polysiloxanes

Two SiCO coatings deposited on AISI 301 type austenitic stainless steel have been prepared by pyrolysis (at 900 °C) from polysiloxane precursors. These precursors have been obtained by hydrosilylation of polymethylvinylsiloxane (V3) with 2,4,6,8-tetramethylcyclotetrasiloxane (D4H), and polymethylhydrosiloxane (PMHS) with 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi). Polymer coatings and coatings after pyrolysis have been studied using IR spectroscopy to determine the efficiency of the hydrosilylation process, as well as examine the degree of transformation to ceramic layers after pyrolysis. The presence of a free carbon phase in the layers after pyrolysis has been investigated by Raman spectroscopy. Oxidation-resistant properties of SiCO layers have been investigated in air atmosphere under isothermal conditions. In order to determine the physicochemical properties of SiCO layers (before and after corrosion tests), SEM, XRD, AFM and nanoindentation methods have been used. •The polysiloxane-derived layers are well cross-linked.•SiCO coatings obtained from cross-linked polisiloxanes are uniform and show good adhesion to steel substrates.•The deposition of SiCO layers on the steel increases its resistance against high-temperature oxidation.