Ceramic alloy coating and coating layer

Abstract

The invention discloses a ceramic alloy coating and a coating layer, wherein the coating includes a ceramic solid phase component, a metal solid phase component and a liquid phase component; the ceramic alloy coating is characterized in that the ceramic solid phase component includes high-hardness oxide ceramic powder, high-emissivity non-metallic oxide ceramic powder and lamellar structural silicate powder; the metal solid phase component includes high-toughness metal fibers and high-thermal-conductivity metal powder; the liquid phase component is one of a liquid silicate inorganic binder, aliquid phosphate inorganic binder and a liquid sol inorganic binder, the strength and toughness of the ceramic coating layer can be effectively improved. Moreover, the preparation method is simple andis prone to promotion and application.

Description

Technical field [0001] The invention relates to the field of ceramic alloy coatings and coatings, and is suitable for long-term heat-resistant and corrosion-resistant protection of metal materials in high-temperature environments. Background technique [0002] As the industry has higher and higher requirements for materials and structures that work in high-temperature environments, people have developed a variety of high-temperature protective coatings for metal anti-corrosion, from single-layer coatings to multi-layers in the traditional sense Composite gradient coating, the coating material is from pure metal material to current ceramic coating and composite coating of metal material and ceramic material, and gives the coating material anti-corrosion, anti-oxidation protection and some special functions. [0003] The coating materials have developed from pure aluminide coatings to the current ceramic thermal barrier coating technology, and the construction methods also range from...

AI Technical Summary

Problems solved by technology

Although the coatings prepared by these materials and processes are excellent in high temperature resistance, oxidation resistance, and corrosion resistance, due to the intrinsic brittleness of ceramic materials, the coatings prepared by them are easily damaged under extreme conditions such as high temperature and thermal shock. Cracking and peeling occurs, leading to coating failure, and in severe cases, damage to equipment and shutdown

[0004] Some people have proposed a toughening scheme for ceramic coatings. For example, CN201710839455 uses carbon nanotubes to toughen SiBCN ceramics, but the method is complicated and uses a large amount of organic gas raw materials, which is costly and pollutes heavily; CN201710604226 discloses a multi-metal hybrid ceramic Matrix composite material, a sandwich structure composed of C / SiC ceramic matrix composite material and metal sheet, however, due to the anisotropy of the sandwich structure, the physical properties of the coating in each scheme are very different, which increases the difficulty of construction; CN201610241996 provides nano Alumina ceramic coating is used to modify the existing ceramic coating. By adding nano-sized particles to the components, the grains, grain boundaries and the combination between them can reach the nano-level, which greatly improves the strength and toughness of the coating. , but the toughening principle of nano-scale particles is mainly based on the point pinning effect, while nano-scale particles are easy to grow during the heating process, and the toughening effect is limited

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