Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Chen, W.R.; Wu, Xijia; Marple, Basil R.; Patnaik, P. C.

doi:10.1016/j.surfcoat.2004.06.027

Cited by 164 publications

(67 citation statements)

References 26 publications

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“…5D), quite clearly consisting in NiCr 2 O 4 and NiO grains ( Fig. 5D and Table 5), which are not protective and grow at a fast rate [30].…”

Section: Microstructure and Thermal Behaviourmentioning

confidence: 99%

Microstructural and tribological comparison of HVOF-sprayed and post-treated M–Mo–Cr–Si (M=Co, Ni) alloy coatings

Bolelli¹,

Cannillo²,

Lusvarghi³

et al. 2007

Wear

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High velocity oxygen-fuel (HVOF)-sprayed wear resistant Co-28%Mo-17%Cr-3%Si and Ni-32%Mo-15%Cr-3%Si coatings, both as-sprayed and after heat treatments at 600• C for 1 h, have been studied. Particularly, their dry sliding wear behaviour has been compared by ball-on-disk tests against different counterbodies (100Cr6 steel and sintered alumina), and differences were discussed based on microstructural characteristics and micromechanical properties (Vickers microindentation and scratch test responses). As-sprayed coatings contain oxide stringers, are mostly amorphous and display rather low Vickers microhardness (about 7.4 GPa for the Co-based and 6.2 GPa for the Ni-based), toughness and elastic modulus. Heat-treated ones display sub-micrometric crystalline intermetallics, improving hardness (9.6 GPa and 7.4 GPa, respectively) and elastic modulus. Scratch tests indicate greater brittleness of the Ni-based alloy (higher tendency to cracking). Due to low hardness and toughness, both as-sprayed coatings undergo wear loss against steel and alumina counterparts. The more plastic Co-based alloy undergoes higher adhesive wear against steel and lower abrasive wear against alumina; the situation is reversed for the Ni-based alloy. After heat treatment, the wear loss against steel is very low for both coatings; abrasive wear still occurs against alumina.

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“…5D), quite clearly consisting in NiCr 2 O 4 and NiO grains ( Fig. 5D and Table 5), which are not protective and grow at a fast rate [30].…”

Section: Microstructure and Thermal Behaviourmentioning

confidence: 99%

Microstructural and tribological comparison of HVOF-sprayed and post-treated M–Mo–Cr–Si (M=Co, Ni) alloy coatings

Bolelli¹,

Cannillo²,

Lusvarghi³

et al. 2007

Wear

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“…High-pressure and high-power inductively coupled thermal plasmas (ICTPs) have become effective heat and chemical species sources for various material processes such as syntheses of diamond films [1,2], thermal barrier coatings [3,4], syntheses of fullerene [5,6], and materials surface modifications [7]. This has occurred because ICTPs can provide advantages of remarkably higher enthalpy and higher radical density than cold plasmas.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle synthesis using high-powered pulse-modulated induction thermal plasma

Tanaka¹,

Nagumo²,

Sakai³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. Nanoparticle synthesis was performed using high-powered pulsemodulated induction thermal plasma (PMITP) technique to study the effect of coil current modulation on synthesized nanoparticles. This is the first paper to present a summary of results of TiO 2 nanoparticle synthesis using high-power Ar-O 2 PMITP at 20 kW. The synthesized particles were analyzed using a field emission scanning electron microscope (FE-SEM), and X-ray diffractometry (XRD). In addition, optical emission spectroscopy (OES) was used during nanoparticle synthesis experiments to measure TiO spectra and to determine the time-averaged vibrational and rotational temperatures of TiO in the reaction chamber. Results showed that the PMITP produced smaller nanoparticles and a narrower size distribution of particles. Moreover, PMITP provided a lower-temperature region in the reaction chamber downstream of the plasma torch than such regions in non-modulated thermal plasmas.

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“…This stresses the importance of also including non-alumina oxides in the TGO thickness measurements when oxidation kinetics is to be established. Many researchers have pointed out the role of TGO growth in limiting the TBC life [8,14,24]; the concept of a critical TGO thickness can even be used as a life prediction model of TBCs. Here, the specimens were observed to fail at similar TGO thickness, 16.5 µm for HX and 14.4 µm for H230, provided that the TGO thickness measurements included all formed TGOs.…”

Section: Oxidation and Interdiffusionmentioning

confidence: 99%

“…When the aluminium reservoir in the bond coat is depleted, through oxidation and interdiffusion, voluminous non-protective oxides, such as chromia, mixed-element spinels and NiO, may form. Voluminous non-protective oxides may introduce cracking due to growth stresses, thereby causing failure of the TBC [8,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate material on the life of atmospheric plasma sprayed thermal barrier coatings

Eriksson

Johansson

Brodin

et al. 2013

Surface and Coatings Technology

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Thermal barrier coatings (TBCs) are used in gas turbines to prolong the life of the underlying substrates and to increase the efficiency of the turbines by enabling higher combustion temperatures. TBCs may fail during service due to thermal fatigue or through the formation of non-protective thermally grown oxides (TGOs). This study compares two atmospheric plasma sprayed (APS) TBC systems comprising of two identical TBCs deposited on two different substrates (Haynes 230 and Hastelloy X). The thermal fatigue life was found to differ between the two TBC systems. The interdiffusion of substrate elements into the coating was more pronounced in the TBC system with shorter life, however, very few of the substrate elements (only Mn and to some extent Fe) formed oxides in the bond coat/top coat interface. Fractography revealed no differences in the fracture behaviour of the TBCs; the fracture occurred, in both cases, to about 60 % in the top coat close to the interface and the remainder in the interface. Nanoindentation revealed only small differences in mechanical properties between the TBC systems and a finite element crack growth analysis showed that such small differences did not cause any significant change in the crack driving force. The oxidation kinetics was found to be similar for both TBC systems for the formation * Corresponding author.

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Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Cited by 164 publications

References 26 publications

Microstructural and tribological comparison of HVOF-sprayed and post-treated M–Mo–Cr–Si (M=Co, Ni) alloy coatings

Microstructural and tribological comparison of HVOF-sprayed and post-treated M–Mo–Cr–Si (M=Co, Ni) alloy coatings

Nanoparticle synthesis using high-powered pulse-modulated induction thermal plasma

Influence of substrate material on the life of atmospheric plasma sprayed thermal barrier coatings

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