<p>In this paper, the erosion behavior of Functionally Graded Material (FGM) and layered coatings of Gd₂Zr₂O₇/Yttria stabilized Zirconia (YSZ/GZ) were compared with usual YSZ TBCs. The coatings were prepared by Atmospheric Plasma Spraying (APS). The room temperature erosion tests were conducted in accordance with ASTM G 76–13. The microstructure of the coating was investigated using scanning electron microscopy and energy-dispersive spectroscopy (EDS) before and after the erosion tests. The results demonstrated that the FGM TBC had higher erosion resistance than the other coatings. It was reported that Gd-containing coatings were much less resistant to erosion than the YSZ TBC system. An important innovation of this study is the use of a GZ layer at the top of the coating without any reduction in erosion resistance. So, the advantages of GZ coating can be achieved without any decrease in the coating’s erosion resistance. It is found that using the FGM structure of GZ TBC can increase the coating’s erosion resistance, even slightly better than a typical YSZ coating. Also, the weight loss of the FGM sample during the initial stages of the erosion test, compared to others, was low and nearly equal to that in the subsequent stages of the test. In the research process, the causes of the mentioned result are studied, and the erosion mechanisms and behaviors of the different coatings are compared and evaluated.</p>