Microstructure formation in thermally-sprayed duplex and functionally graded NiCrAlY/Yttria-Stabilized Zirconia coatings

Experiments on life cycle extensions of geothermal turbines by multi composite technology

“…The stability is obtained due to NiCoC coating deposited on steel and in particular mixed to 3-5% ZrO 2 , codoped with the 5% Y 2 O 3 (Matthews et al, 2008;Khaddami et al, 2007). We chose to specifically analyze the relationship between the parameters that define the life extension and structural changes induced in ceramic type layer protection potential used on the geothermal components.…”

Study of microstructure and thermal shock behavior of two types of thermal barrier coatings

“…Figure 16 shows the bond strength of duplex and FGM coatings. The mean strength for duplex coating was measured about 37.9 MPa, while the figure for FGM coating was determined to be about 57.8 MPa (1.5 times of duplex coating) [22]. This improvement in the bond strength is believed to be due to the lower internal tensile stress in FGM coating compared with what is in duplex coating, as Khor and others reported [10,23].…”

Development of graded Ni–YSZ composite coating on Alloy 690 by Pulsed Laser Deposition technique to reduce hazardous metallic nuclear waste inventory

“…), electron beam physical vapor deposition technique, dip coating, sol-gel, aluminizing process, slurry coating, etc. [17][18][19][20][21]. However, available X-Cr 2 O 3 (where X: Al 2 O 3 , ZrO 2 ) phase diagrams ( Fig.…”

“…Available literatures on 'YSZ coating over metallic substrates' reveal that significant number of attempts have been made with nickel based Superalloys such as Inconel TM 718, Hastelloy TM X, Inconel TM 601, Inconel TM 625, and Inconel TM 738 LC [29][30][31]. Among the various techniques tried, plasma spray route [17,18,31] is found to yield the best results in terms of excellent thermal, mechanical and chemical properties of the coating, suitable for specific applications in jet engines, gas turbines, diesel engines, etc.…”

“…Among the various techniques tried, plasma spray route [17,18,31] is found to yield the best results in terms of excellent thermal, mechanical and chemical properties of the coating, suitable for specific applications in jet engines, gas turbines, diesel engines, etc. However, coatings developed through plasma spray route suffer from porosity and permeability (interconnected porosity), and hence cannot be a good choice as far as 'diffusion barrier application' is concerned.…”