Effects of Substrate Treated by Dry-Ice Blasting on the Formation of CoNiCrAlY Splats

Dry-ice blasting, as an environmental-friendly method, was used to pretreat the substrate to be coated. In the present paper plasma-sprayed CoNiCrAlY splats were examined on the dry-ice blasted substrate. The cleaning effect of dry-ice blasting was demonstrated accompanying the condensation phenomenon, which is also harmful for the formation of ideal disk-like splat. A solution of ensuring the substrate temperature over dew point temperature was proposed for the proper application of dry-ice blasting during droplet flattening.