Indentations on Air Plasma Sprayed Thermal Barrier Coatings Prepared by Different Starting Granules

Figure 8

Typical Hertzian indentation damage and cracks on the surface of YSZ coatings deposited by APS, using WC sphere radius  mm; (a), (b) ring crack damage is found in YZ-WH or YZ-AH and (c) radial crack damage is found in YZ-WD.

(a)

(b)

(c)