A simple method for the preparation of plasma-sprayable powders based on ZrO2
PARVATI RAMASWAMY, S. SEETHARAMU, K. B. R. VARMA
JOURNAL OF MATERIALS SCIENCE
abstract:Plasma-sprayable powders of calcia, magnesia and yttria-stabilized zirconia have been prepared by using polyvinyl alcohol binders. The powders have been characterized for sprayability by spray coating on steel plates previously coated with an NiAI bond coat. The suitability of these coatings for thermal barrier applications have been examined. Thermal barrier and related properties, along with phase stability and mechanical properties, have been found to be good. Failure of the thermal barrier coating has been observed to occur at the interface between the bond coat and the substrate, due to the formation of a pile-up layer consisting of Fe Zr AI-O compound.
keyword:grade; bond coat; binders; thermal barrier; pile-up; Plasma spraying
|
