The ceramic surface coating is used to form a ceramic coating on the surface of the substrate, which can be used as anti-corrosion. It is a mixture of oxygen and acetylene, which melts the ceramic rods, atomizing the melted ceramic rods from the compressed air into tiny droplets that are sprayed onto the substrate to form ceramic coatings. So what is the coating process for zirconia ceramic rods?
Substrate surface pretreatment
In order to make the coating and substrate with good bonding strength, the coating substrate surface must be pretreated, the methods are as follows: purification treatment, solvent cleaning, alkali cleaning, ultrasonic cleaning, heat treatment, etc.
After the purification, the surface of the substrate is treated with sandblasting to form a rough rough surface, so as to form a good cohesive force with the coating. The main methods of surface roughening are sandblast roughening, spraying self-bonded metal layer, car groove, embossing roller, plane groove and other machining methods.
Ceramic spraying is performed on the roughened substrate. The thickness of the ceramic coating can be controlled according to actual requirement, and the optimum thickness of the ceramic coating is 0.3mm~1.0mm. For the complex shape of the workpiece, it can be sandwiched on the lathe and other fixtures for ceramic spraying.
The finishing process
If the surface of the workpiece needs fine coordination, the grinding process will be required after spraying. If corrosion-resistant parts, such as acid-proof pump shell, also need to be “sealed”. Because the ceramic coating has a certain gap, the porosity of which is about 4~12%, and the pores are interconnected and extend from the surface to the matrix. In order to prevent the corrosive media from infiltrating the matrix through pores, the micropores need to be closed.
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