The Factors Affecting Thermal Spray Bonding Strength of Boiler Tube

The main influencing factors of the bonding strength of the boiler tube surfaces are related to the state of the substrate and the sprayed particles. The way to improve the bonding strength of the coating include the following points:

A Selecting the appropriate process to keep the sprayed particles in a good melting before combining with the substrate.

B Improving the instantaneous kinetic energy as much as possible, when spraying particles collide to the substrate.

C Preheating the substrate before spraying, and the preheating temperature is typically less than 150 ° C.

D Removing the oil and rust on the surface of the substrate to make the substrate surface as clean as possible.

E Sandblasting coarsening with the substrate surface to increase the contact area of coating with the substrate.

F Taking away the dust promptly in the environment to keep the spray surface cleaning during spraying; Also need to cool the substrate to prevent the matrix overheating.

G Using remelting treatment after spraying for some coatings, which can make the coating and the matrix to form a combination of micro-metallurgy.

The thermal spraying of boiler tube surface is the main anti-wear method. And every year there are 500,000 square meters of spraying in China. We should focus on the bonding strength, which is the main factor to influence the boiler anti-wear function.