Effect of TGO evolution and element diffusion on the life span of YSZ/Pt–Al and YSZ/NiCrAlY coatings at high temperature

Chen, Hongfei; Zhang, Chi; Xuan, Jihang; Liu, Bin; Yang, Guang; Gao, Yanfeng; Luo, Hongjie

doi:10.1016/j.ceramint.2019.09.037

Cited by 27 publications

(6 citation statements)

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“…However, the above research mainly considers the growth of α-Al2O3, which serves as the resistance to oxidation. Moreover, the induced stress can be almost released by creep Nowadays, many researchers focus on continuous TGO growth and the induced stress evolution in TBCs [54][55][56][57][58][59][60]. Evans et al [61] utilized Eshelby's elastic inclusion method to make TGO growth equivalent to the self-assembly process of the free expansive TGO shell, and then established a sphere model of TGO growth.…”

Section: Research Advance On Tgo Growthmentioning

confidence: 99%

Long-Term Failure Mechanisms of Thermal Barrier Coatings in Heavy-Duty Gas Turbines

Xie

Zhang

2020

Coatings

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Thermal barrier coatings serve as thermal insulation and antioxidants on the surfaces of hot components. Different from the frequent thermal cycles of aero-engines, a heavy-duty gas turbine experiences few thermal cycles and continuously operates with high-temperature gas over 8000 h. Correspondingly, their failure mechanisms are different. The long-term failure mechanisms of the thermal barrier coatings in heavy-duty gas turbines are much more important. In this work, two long-term failure mechanisms are reviewed, i.e., oxidation and diffusion. It is illustrated that the growth of a uniform mixed oxide layer and element diffusion in thermal barrier coatings are responsible for the changes in mechanical performance and failures. Moreover, the oxidation of bond coat and the interdiffusion of alloy elements can affect the distribution of elements in thermal barrier coatings and then change the phase component. In addition, according to the results, it is suggested that suppressing the growth rate of uniform mixed oxide and oxygen diffusion can further prolong the service life of thermal barrier coatings.

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Section: Research Advance On Tgo Growthmentioning

confidence: 99%

Long-Term Failure Mechanisms of Thermal Barrier Coatings in Heavy-Duty Gas Turbines

Xie

Zhang

2020

Coatings

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“…Therefore, the use of plasma torches, plasma spray, and jets demands an indispensable consideration to generate highly efficient materials and overwhelming technology for developing nations. The plasma jet plants can implement a circular economy framework for the rising needs [68][69][70][71][72][73].…”

Section: Plasma Technologymentioning

confidence: 99%

Technologies to Manage Used Automotive Oil Filters in Iran: A Review Study

Hassanpour¹

2021

Arch Hyg Sci

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Background & Aims of the Study: Given that modern society is a rapidly moving civilization, the production of automobiles resulted in a massive quantity of Used Automotive Oil Filters (UAOFs). So handling the waste stream secures value-added to the national assets and underpins the demands in other sectors. The steel request is highly rising with the population growth, and dismantling and recycling UAOFs produces enough scrap steel to be retrieved in similar applications. Experts of this sector have forgotten this resource. The present review sought the UAOF recycling technologies from the initial step of the project to the recent developments in this area. Also, plasma technology application was addressed as the new technology posed and noticed its modern procedure in the UAOF recycling operation based on the existing technologies. Materials and Methods:In this review, the related articles were searched and studied using key relevant words. Also, we used valuable existing references in this regard. The industrial data employed in the present review refers to the project identification steps expressed and investigated by evaluator teams in the Environmental Impact Assessment (EIA) plan. Results:The collected results and concepts emphasized the redesign and reproduction of UAOF and employing frequently recycled scrap parts in the steel manufacturing operation. Conclusion:The plasma technology enhances the adhesion, wettability, electro-conductivity, and many other characteristics of adsorbents within AOF and generates value-added products and nano-metal oxides from scrap metals of UAOF.

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“…8,9 During hightemperature service, there will be a thermally grown oxide (TGO) layer formed between the TC layer and the BC layer, which consists of mixed oxide clusters of chromium (Cr, Al) 2 O 3 , spinel Ni(Cr, Al) 2 O 4 , and nickel oxide NiO (CSN). [10][11][12] However, the hot components covered with TBCs serve in the harsh environment of high temperature, high pressure, and high thermal stress during the takeoff, cruise, and landing of the aircraft, which will accelerate the premature spallation failure of TBCs. Therefore, it is important to prolong the thermal cycling lifetimes and improve the thermal shock resistance of TBCs.…”

Section: Introductionmentioning

confidence: 99%

“…The common BC material is MCrAlY (M: Ni, Co, and Ni + Co), which is necessary to accommodate the thermal expansion misfit between the ceramic coating and the substrate 8,9 . During high‐temperature service, there will be a thermally grown oxide (TGO) layer formed between the TC layer and the BC layer, which consists of mixed oxide clusters of chromium (Cr, Al) 2 O 3 , spinel Ni(Cr, Al) 2 O 4 , and nickel oxide NiO (CSN) 10–12 . However, the hot components covered with TBCs serve in the harsh environment of high temperature, high pressure, and high thermal stress during the takeoff, cruise, and landing of the aircraft, which will accelerate the premature spallation failure of TBCs.…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of thermal barrier coatings modified by selective laser remelting and alloying techniques

et al. 2022

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Aiming to improve the thermal shock resistance of thermal barrier coatings (TBCs), the plasma-sprayed 7YSZ TBCs were modified by selective laser remelting and selective laser alloying, respectively, in this study. A self-healing agent TiAl 3 was introduced into the 7YSZ TBCs by selective laser alloying to fill cracks during thermal cycling. The thermal shock experiments of the plasma-sprayed, laser-remelted, and laser-alloyed TBCs were conducted by a means of heating and water-quenching method. Results revealed that some segmented microcracks were distributed on the surface of the laser-remelted and the laser-alloyed zones, showing a dense columnar crystal structure. After thermal shock tests, the numbers of segmented microcracks on the laser-remelted coating increased, whereas, in the laser-alloyed condition, some irregular particles formed, leading to the decreased numbers of segmented microcracks. The laser-alloyed coating exhibited the best thermal shock resistance, followed by the laser-remelted condition, with the thermal shock lifetime 3.3 and 2.7 times higher than that of the as-sprayed coating, respectively. On the one hand, both columnar grains and segmented microcracks in the laser-treated zone could effectively improve the strain tolerance of coatings. On the other hand, the oxidation products of TiAl 3 under high-temperature condition could seal the microcracks to postpone the crack connection. Thus, the thermal shock resistance of the laser-treated coatings was significantly improved.

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Effect of TGO evolution and element diffusion on the life span of YSZ/Pt–Al and YSZ/NiCrAlY coatings at high temperature

Cited by 27 publications

References 50 publications

Long-Term Failure Mechanisms of Thermal Barrier Coatings in Heavy-Duty Gas Turbines

Long-Term Failure Mechanisms of Thermal Barrier Coatings in Heavy-Duty Gas Turbines

Technologies to Manage Used Automotive Oil Filters in Iran: A Review Study

Thermal shock resistance of thermal barrier coatings modified by selective laser remelting and alloying techniques

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