Erosion wear is one of the most common forms of wear, accounting for 8% of the total number of wear failures. It widely exists in modern industrial production, such as abrasion of turbine blades, mud pumps, 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 to prevent and repair the wear of parts. The composite material, which is made of modified epoxy resin as adhesive and added with ceramic particles, has excellent erosion wear resistance after curing. It is applied to the surface of various flow passage parts as an abrasion resistant coating material. The coating process is simple, the cost is low, and there is no heat affected zone and deformation. This composite material can be used not only for the corrosion resistant and wear-resistant pre coating of the part surface and the repair of the corrosion worn surface of the part, but also widely for the repair of various defects on the workpiece, such as cracks, scratches, size out of tolerance and casting defects. This blend system can show good properties only when the organic phases, inorganic fillers, and the surface of the skeleton material are firmly bonded with the organic phases in contact with each other. In order to improve the adhesion between interfaces, an interface crosslinking agent, called coupling agent, is needed. Among the epoxy adhesion promoter, the most mature and practical is the organic silane coupling agent. CFS-302 used in this test belongs to this kind of coupling agent. Its surface energy γ C Surface energy of epoxy resin adhesive γ Meet the necessary conditions for good coupling effect between: γ ≥ γ。
Common methods of using organic silane coupling agents are as follows:

1. Surface treatment method. The coupling agent with mass fraction of 0.5%~1.0% is prepared into 95% ethanol solution, which is added to the filler and stirred evenly during use. After drying, it is baked at 120~160 ° C for 30min, and then cooled to room temperature. This method is beneficial to the uniform dispersion of coupling agent and can realize the organic treatment of filler surface in a short time.

2. Directly treat the filler.

3. Migration method. The selected silane coupling agent is calculated as 1%~5% of the dry adhesive content and directly added to the adhesive component. During the curing process, due to the diffusion of molecules, 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 they are not conducive to the uniform dispersion of coupling agent. Therefore, in this experiment, the author chooses the first two methods to treat silicon carbide particles and disperse them with ultrasonic wave.

5. The effect of adding coupling agent CFS-302 to the epoxysilane adhesive coating on the adhesive strength (including shear strength, tensile strength and bending strength) and wear resistance of the blend system was emphatically studied, so as to determine a better use method and the best addition amount in the adhesive coating.