Wear-resistant ceramic coatings (epoxy resin adhesive coatings) have excellent wear resistance and are widely used in material protection and part repair, such as repairing scratches, casting defects, external cracks, part wear, part leakage, etc. Due to its simple and efficient repair process and economic feasibility, this technology has received increasing attention from people. So what factors affect the wear resistance of wear-resistant ceramic coatings?
The main component of the wear-resistant function in the coating is aluminum oxide ceramic powder. When the powder addition is small, there are fewer support points for wear resistance, and the coating cannot be effectively protected.
As the amount of powder added increases, the area of ceramics that can withstand wear increases, and the coating is protected, resulting in a decrease in weight loss due to wear. When the powder content reaches a certain level, the wear rate becomes quite low. When the powder exceeds a certain amount, the bonding between the adhesive and the ceramic powder is incomplete. Under the action of frictional force, some ceramic powders fall off as a whole due to insufficient shear strength, which does not play an anti-wear role, resulting in a significant increase in weight loss due to wear, and a decrease in the wear resistance of the coating.
2、The effect of powder particle size on wear resistance
When the powder particles are small, the contact area between the particles and the adhesive is small, and the bonding force is not strong enough, making it easy for particles to fall off during the wear process. As the powder particle size increases, the bonding area also increases. The tendency for the bonding surface to detach or the adhesive to deform or crack decreases.
When the powder particle size reaches a certain amount, the wear rate gradually decreases. However, when the particle size exceeds a certain limit, bonding defects such as pores increase, and the bonding force instead decreases. During the wear process, large ceramic particles fall off, resulting in a significant increase in wear rate. The exposed adhesive layer cannot be protected and does not play a wear-resistant role.
Therefore, the size of ceramic particles also has a significant impact on wear resistance, and both too large or too small particle sizes are not suitable.