What are the common thermal spraying technical problems

       

Recently, there have been many consultation calls from all walks of life. Facing the questions and concerns of customers, I will make a summary here. Most of the customers don't know much about the thermal spraying process, thinking that the thicker the better. Anything is too much. For different products and different requirements, the thickness varies from 0.05 to 0.5. I sprayed 1.5 mm thick, but it is only a special situation. I suggest that the thickness should not exceed 0.3.

The separation strength of thermal spray is not high. This separation strength is only relative, not an absolute concept. Using high-performance supersonic spraying equipment, the separation strength is less than 60MPa. What is this concept? 1MPa=10kg/cm2, which means that each square centimeter can withstand a pulling force of 600 kg, so under normal conditions, such a separation strength is sufficient.

 

The big problem is that the thermal spray coating is brittle. For the same nickel-based alloy, the toughness of the coating made by spray welding and spraying is very different, which is determined by the process itself. Therefore, the thermal spray coating cannot be impacted, not a problem of hardness, nor a problem of separation strength, but a problem of the process itself.

 

Thermal spray is too expensive. The reason for the high price is: the price of the original material is high. The price of raw materials with the same ingredients in the market will be very different. We use domestic brand products, strict control of ingredients, stable quality and high price. When powder spraying, the powder rate is low. Some people say that you are not using imported equipment, why is the accumulation rate low? Due to the high speed of the flame flow of the spray gun of the imported equipment and the serious rebound, the accumulation rate is lower than that of the domestic equipment.