|
2536 |
|
Effect of the grit blasting exposure time on the adhesion of Al2O3 and 316L coatings |
|
Monika Vilemova* / Institute of Plasma Physics AS CR, v.v.i.
, Czech Republic Michal Kazda / Czech Technical University in Prague, Czech Republic Jan Siegl/ Czech Technical University in Prague, Czech Republic Jiri Matejicek/ Institute of Plasma Physics AS CR, v. v. i., Czech Republic |
|
The reliability of the interface in the coating-substrate system is an important coating quality. Previous works dealing with coating adhesion proved that substrate treatment is a critical factor influencing the strength of the coating-substrate interface. In this study, the effect of grit blasting exposure time on the adhesion of plasma sprayed Al2O3 and 316L coatings was studied. The coatings were deposited using WSP torch on steel substrates. The substrates were grit blasted prior to the coating deposition, one set of substrates with exposure time of 1 s and another set of substrates with exposure time of 4 s. Adhesion was evaluated using standardized pull-off test. The results showed a slight improvement in the adhesion strength for the exposure time of 4s. Detailed fractografic analysis of the fractured area was carried out to identify the mechanisms of adhesive and cohesive failure. |