Mechanical Engineering Commons^™

Understanding The Heat Transfer And Solidification Plasma-Sprayed Yttria-Stabilized Zirconia Coatings, Guo-Xiang Wang, R. Goswami, S. Sampath, V. Prasad

Dr. Guo-Xiang Wang

A variety of microstructures have been observed in plasma-sprayed yttria-partially stabilized zirconia (YSZ) thermal barrier coatings. Control of the coating microstructures requires a good understanding of the heat transfer and solidification during the process. This article presents a quantitative analysis of heat transfer and solidification of plasma-sprayed YSZ splats. The analysis is based on a simple heat transfer and solidification model that solves a one-dimensional moving boundary problem with consideration of melt undercooling prior to solidification and nonequilibrium crystalline growth kinetics at the moving interface. The solidification morphology is first assumed to be planar, and the stability of the planar …