Investigation of Plasma‐Sprayed Dysprosia Coatings

Plasma‐sprayed coatings of dysprosia were made and characterized. The coatings consisted mostly of the metastable, monoclinic phase and minor amounts of the cubic phase. Grinding did not transform the high‐temperature monoclinic phase, but, on annealing in air at 800° for 5 h, 50% reversion to the cubic phase occurred. Commercial yttria‐stabilized zirconia thermal barrier coatings out‐performed unannealed plasma‐sprayed dysprosia coatings in terms of wear resistance.