The effect of alloying additions on MCrAlY systems—An experimental study

The influence of sulfur pressure on Sulfidation behaviour of NiCoCrAl(Y) alloys at high temperature

“…1 the concentration profiles of elements across the scale/alloy lV7 and IWx, at sulfur pressure of lo5, I (Ni, Co)S + ( li, co)3 s4 ]r (Co,Ni)A12S4 (Cr, Ni,Co)A12S4 I ENERGY Fracture section of sulfide scale formed on NiCoCrAlY alloy at I173 K and ps2 = 10s Pa with EDX spectra from marked points Abb. This observation is supported b .…”

Design of novel thermal barrier coatings with reduced thermal conduction and thermal radiation

“…In a conventional MCrAlY bond coat, Cr provides hot-corrosion resistance, A1 forms OC-AI2 O 3 , and the role of Y is to improve the bond adhesion to the substrate. Based on one theory, the Y was found to combine with sulfur and prevent its segregation to the oxide layer, which is detrimental to its adhesion [8,9].…”

“…The EB-PVD coating generally has lower modulus of elasticity than the counterpart of plasma sprayed coating. For example, the Young's moduli of 8 YSZ obtained by sintering, EB-PVD and plasma spraying were measured by laser ultrasonic and resonant techniques. As shown in Figure 19, the modulus of plasma sprayed 8 YSZ is almost the same as that of bulk material at low temperatures, whereas the young's modulus o f EB-PVD coatings is less than half that o f plasma sprayed coatings [41].…”

“…The process of powder consolidation is used to form a homogeneous green body with high packing density. The effect of compact pressure on green density and sintering density for microsized 8 YSZ powders has been examined [110]. The results indicated that increasing the compaction pressure beyond 150MPa did not result in higher sintered density.…”

“…To incorporate more scattering centers without affecting the crystal structure and phase stability, transition metal oxides and rare earth oxides have been used either singly or together as dopants for YSZ. For example, Tamarin et al [85] added five types of metal oxides with total amounts less than 5% to ZrC>2 - 8 These experimental results might be skewed by the pores existing in the EB-PVD coatings. Thus, fully densed co-doped materials may give more accurate results with regard to the intrinsic properties of the doped oxides.…”