The main purpose of coating technology is to deposit one or more thin films on the surface of a substrate to alter or enhance its physical, chemical, optical, or mechanical properties, or to endow the substrate with new functions. The purpose of coating technology can be specifically divided into the following aspects:

Improve surface performance:

Enhance wear resistance: such as coating tools or mechanical components with a layer of hard alloy or ceramic film to extend their service life.

Improve corrosion resistance: such as coating metal surfaces with a layer of anti-corrosion coating to prevent rusting.

Optical characteristics:

Enhanced reflectivity or transmittance: such as coating multiple layers of thin films on optical components to achieve specific optical effects, such as mirrors, filters, etc.

Adjusting refractive index: such as coating lenses or optical fibers to control the propagation path of light.

Electrical characteristics:

Changing conductivity: For example, coating a conductive film on a circuit board to improve its conductivity.

Provide insulation layer: such as coating electronic components with insulation to prevent short circuits.

Thermal characteristics:

Improve heat dissipation: For example, coating the radiator with a thermal conductive layer to enhance heat dissipation.

Provide insulation layer: such as coating building glass with insulation film to reduce heat transfer.

Decorative:

Provide a beautiful appearance, such as coating jewelry or decorations with metal film to increase luster and aesthetics.

Functionality:

Give new functions, such as coating medical devices with biocompatible coatings to reduce biological rejection.

environmental protection:

Improving energy efficiency: such as coating solar panels with selective absorption coatings to enhance photoelectric conversion efficiency.

Reduce environmental pollution: such as coating the exhaust system of automobiles with catalytic coatings to reduce the emission of harmful gases.

Coating technology can be achieved through different methods, such as physical vapor deposition (PVD), chemical vapor deposition (CVD), electroplating, painting, etc. The choice of suitable coating technology depends on the required film characteristics, substrate type, cost, and production requirements.