Erosion wear is one of the more common forms of wear, accounting for 8% of the total wear damage that often occurs. It is widely found in modern industrial production, such as water turbine blades, mud pumps, and wear of mixing blades and guard plates in concrete and asphalt mixers. Therefore, it is very important to choose a simple, fast, low-cost and effective process that can prevent and repair the wear of parts. The composite material made of modified epoxy resin as a binder and adding ceramic particles has excellent erosion and wear resistance after curing [1]. It is used as a wear-resistant coating material in various overcurrent parts. The surface, the coating process is simple, the cost is low, and there is no heat-affected zone and deformation. In addition to the corrosion-resistant and wear-resistant prefabricated coatings on the surface of the parts and the repair of the corrosive and worn surfaces of the parts, this composite material is also widely used to repair various defects on the workpiece such as cracks, scratches, and out-of-tolerance dimensions. and casting defects. This blending system can show good performance if and only when the organic phases, the inorganic filler and the surface of the framework material and the organic phases in contact are firmly bonded together. In order to improve the bonding between the interfaces, an interface cross-linking agent, called a coupling agent, is required. Among the epoxy silanes resin adhesives, the most mature and practical is the organic silane coupling agent. The KH-550 used in this test belongs to this type of coupling agent. Its surface energy γc is the same as the surface energy γ of the epoxy resin adhesive. The necessary conditions for good coupling effect are satisfied: γ≥γ.

The commonly used methods of using organosilane coupling agents are as follows:
1) Surface treatment method. The coupling agent with a mass fraction of 0.5% to 1.0% is prepared into a 95% ethanol solution, added to the filler and stirred evenly, dried and then dried at 120 to 160 ° C for 30 minutes, and then cooled to room temperature. . This method is conducive to the uniform dispersion of the coupling agent, and can realize the organic treatment of the filler surface in a short time.

2) Direct treatment of the filler.

3) Migration method. The selected silane coupling agent is directly added to the adhesive component according to 1% to 5% of the dry glue amount of the adhesive. During the curing process, due to molecular diffusion, the coupling agent molecules migrate to the surface of the bonded material.

4) Add the coupling agent to the epoxy/filler mixed system. The disadvantage of the latter two methods is that it is not conducive to the uniform dispersion of the coupling agent, so in this experiment, the author chooses the first two methods to treat the silicon carbide particles and disperse them with ultrasonic waves.
The effect of adding coupling agent KH-550 to the epoxy adhesive coating on the bonding strength (including shear strength, tensile strength and flexural strength) and abrasion resistance of the blending system was emphatically studied in order to determine the The best use method and the best addition amount in the coating.

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