Influence of the intermixed interfacial layers on the thermal cycling behaviour of atmospheric plasma sprayed lanthanum zirconate based coatings

摘要: Abstract In application as a thermal barrier coating (TBC), yttria stabilised zirconia (YSZ) approaches some limits of performance. To further enhance the efficiency gas turbines, higher temperature capability and longer lifetime are needed for next generation TBCs. Pyrochlore oxides general composition, A 2 B O 7 , where is 3 + cation (La to Lu) 4 (Zr, Hf, Ti, etc.) have high melting point, fair coefficient expansion, low conductivity which make them suitable applications coatings. Among those oxide materials lanthanum zirconate (LZ/La Zr ) offers very attractive properties. This work describes fabrication, microstructure (1280 °C) cycling behaviour coatings with five different architectures, deposited using atmospheric plasma spray process. The architecture had layers two intermixed interlayers much life time than other considered architectures. were characterised X-ray diffraction, energy dispersive spectrometry, optical scanning electron microscopy, before after tests, study failure mechanisms.