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Views: 14 Author: Site Editor Publish Time: 2021-12-07 Origin: Site
Alumina ceramic powder is one of the raw materials used in ceramic coating, ceramic coating has excellent wear resistance, corrosion resistance, high temperature resistance and high thermal resistance, and in the process of working basically does not affect the mechanical properties of the matrix, so it is widely used in aerospace, weapons equipment, mechanical engineering and other fields.
Classification of ceramic coatings:
There are many kinds of ceramic coatings, which can be roughly divided into wear-resistant ceramic coatings, corrosion resistant ceramic coatings and thermal barrier ceramic coatings according to different functional properties.
Wear-resistant ceramic coatings mainly include oxides, carbides, silicides, nitrides and borides. Features: stable chemical properties, high hardness, good resistance to high temperature oxidation and excellent wear resistance. Application: cutting tools, hard tools, wear-resistant parts, etc.
Corrosion resistant ceramic coating is mainly used to protect matrix parts from various environmental corrosion. Application: Marine environment of offshore equipment, cutting fluid environment of cutting tools, molten zinc liquid environment of galvanized sunken roller, etc.
Thermal barrier ceramic coating is a coating system composed of metal-bonded ceramic bottom layer and ceramic heat insulation surface layer, characterized by high hardness, high chemical stability, and can significantly reduce the temperature of the substrate. Application: Aeroengine, steam turbine, turbine blade.
Preparation of ceramic coating:
1. Thermal spraying method
2. Sol-gel method
3. Vapor deposition
4. Self-propagating high temperature synthesis method
5. Laser cladding technology
With the continuous research and development of alumina ceramic powder in various fields of application and preparation methods are more and more widely, the high purity and low impurity of alumina powder determines the quality parameters of ceramic powder.
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