Cr-Ti-C-N-O polybasic composite ceramic membrane on surface of steel-based material and preparation method thereof

• Main Authors: LI SONGXIA, ZHANG JIN, XUE QI, YAO LONGKUI, CHENG XIAOWEI, XU ZHUHUA
• Format: Patent
• Language: Chinese; English
• Published: 27.04.2011
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to a Cr-Ti-C-N-O polybasic composite ceramic membrane on the surface of a steel-based material and a preparation method thereof. The composite ceramic membrane layer sequentially comprises a TiCrC layer, a TiCrCN layer, a TiCrN layer, a CrN layer and a Cr2O3 layer from the surface of the steel-based material to outside and has the total thickness of 12-18 microns. The preparation method comprises the following steps of: arranging a steel-based part in a closed container to and heating to 700-1000 DEG C, mixing and introducing high-purity TiCl4 vapor, CrCl4 vapor, CH4 and H2 in a mol ratio of 3 to 1 to 10 to 100 for 40-60 min; mixing and introducing the high-purity TiCl4 vapor, the CrCl4 vapor, the CH4, the N2 and the H2 in a mol ratio of 3 to 1 to 5 to 60 to 100 for 20-40 min; mixing and introducing the high-purity CrCl4 vapor, the N2 and the H2 in a mol ratio of 3 to 60 to 100 for 30-50 min; and mixing and introducing the high-purity CrCl4 vapor, the CO2 and the H2 in a mol ratio of 3 t