Al/NiCrAlY/Al2O3 compound coating, preparing method and application thereof

• Main Authors: LI JINLONG, DONG MINPENG, QIU JIALIN, DUAN JIANI, REN XUERU, MA FULIANG, XU LUFENG, SU ZIKUAN
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2020
• 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 discloses an Al/NiCrAlY/Al2O3 compound coating which comprises an Al layer, a NiCrAlY layer and an Al2O3 coating. The NiCrAlY layer and the Al2O3 coating are sequentially formed on the Al layer. The invention further discloses a preparing method of the Al/NiCrAlY/Al2O3 compound coating. The preparing method includes the steps that the Al layer and the NiCrAlY layer are sequentially deposited on a workpiece through a multi-arc ion plating technology, and an Al/NiCrAlY layer is formed; and heat treatment is conducted, an Al2O3 coating is formed on the surface of the Al/NiCrAlY layer, and the Al/NiCrAlY/Al2O3 compound coating is obtained. The prepared Al/NiCrAlY/Al2O3 compound coating has the good high-temperature oxidation resisting performance, damp and heat resisting performance and salt spray resisting performance and is suitable for surface protection of high-temperature and ocean environment key parts. In addition, the preparing method of the Al/NiCrAlY/Al2O3 compoundcoating is simple and eas