Thermal resistance of Al2O3 coating produced by electrostatic spray deposition method. (July 2016)

• Record Type: Journal Article
• Authors: Krella, A.K.; Sobczyk, A.T.; Krupa, A.; Jaworek, A.
• Is Part Of: Mechanics of materials. Volume 98(2016:Jul.)
• Page Start: 120
• Page End: 133
• Publication Date: 2016-07
• Subjects: Al2O3 coating -- Nanoparticle -- Thermal resistance -- Electrostatic spray deposition, EHDA; Strength of materials -- Periodicals; Mechanics, Applied -- Periodicals; Résistance des matériaux -- Périodiques; Mécanique appliquée -- Périodiques; Mechanics, Applied; Strength of materials; Periodicals; Electronic journals; 620.11
• DOI: 10.1016/j.mechmat.2016.05.002
• Languages: English
• ISSNs: 0167-6636

Abstract

Highlights: Al2 O3 coating has been produced by electrostatic spray deposition technique. Thermal resistance of Al2 O3 -based coating on X10CrAlSi18 steel substrate are presented. Microscopic observations showed that all coatings were porous and built from agglomerates, whose size was depended on the size of primary Al2 O3 nanoparticles. Thermal cycles caused many cracks in the coating located around the agglomerates. Delamination of the coating has not been noted after all thermal cycles. Abstract: Results of experimental investigation of effect of Al2 O3 nanoparticle sizes on morphology and thermal resistance of Al2 O3 -based coating deposited by means of electrostatic spray deposition technique on X10CrAlSi18 steel substrate are presented in this paper. Microscopic observations showed that all coatings were porous and built from agglomerates, whose size was depended on the size of primary Al2 O3 nanoparticles. It was noticed that surface roughness was lower for primary Al2 O3 nanoparticles of larger size. Thermal cycles caused many cracks in the coating, which were located around the agglomerates. Larger number of cracks was formed in the coating produced from smaller Al2 O3 particles, and it was observed that the number of cracks decreased with an increase of Al2 O3 particle size, but at the same time, the depth of these cracks increased. With an increase of the number of thermal cycles, the surface roughness and the number of cracks slightly decreased. No delamination of the coating was noted at any specimen after all thermal cycles.