TiN-SiO2 double layer composite coating with enhanced oxidation resistance and reusability in anti-coking applications

•TiN/SiO2 double-layer coating owns the excellent oxidation resistance.•Durability is evaluated from three aspects: surface roughness, bonding force and coking inhibition performance.•TiN/SiO2 coating maintains great reusability and anti-coking ratio being up to 92% during repeated use.•The superiority of TiN/SiO2 coating results from the isolation of outer layer and the buffering of inner layer.