Microstructure and Performance of the APS Sealing Coating Based on the EB-surfi-texturing Surface

To solve the problem of the coating spallation which happened during the coating’s service life, In this experiment, a new method was studied, and the EB-Surfi-texturing was conducted on the substrate surface to form various modeling structures by EB-surfi equipment before spraying technology. Then the APS technology was utilized to deposit the coating on the structured surface. The coating’s microstructure, porosity, micro-hardness, bonding strength and thermal shocking-resistant performance were tested by the optical microscope, micro-hardness testing equipment, tensile test equipment and high temperature stove. Test results indicated that the appropriate EB-Surfi-texturing structure can increase the coating’s thermal shocking-resist performance and it was effective to protect the coating from spallation and enlarge the coating’s service life. That is because the EB-Surfi-texturing structure can increase the bonding area and improve the bonding strength between the coating and substrate. Therefore, the coating’s stress was released timely, It is effectively to prohibit the coating from spallation and then the coating’s service life was enlarged for these above reasons.