Atmospheric plasma sprayed thick thermal barrier coatings: Microstructure, thermal shock behaviors and failure mechanism

Tao, Shiqian; Yang, Jianli; Shao, Fang; Zhao, Hao; Zhong, Xinghua; Zhuang, Yin; Sheng, Jing; Ni, Jie; Li, Qinghui; Tao, Shunyan

doi:10.1016/j.engfailanal.2021.105819

Cited by 26 publications

(4 citation statements)

References 46 publications

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“…In fact, the columnar grains in the laser‐remelted TBCs can expand and contract during thermal cycling to accommodate tensile stresses 21 . Besides, the vertical cracks in the laser‐remelted TBCs can open during tensile loading, which are beneficial to alleviating the accumulated thermal stress 14 . Finally, the thermal shock lifetimes of the laser‐remelted TBCs are prolonged.…”

Section: Resultsmentioning

confidence: 99%

“…21 Besides, the vertical cracks in the laser-remelted TBCs can open during tensile loading, which are beneficial to alleviating the accumulated thermal stress. 14 Finally, the thermal shock lifetimes of the laser-remelted TBCs are prolonged.…”

Section: Thermal Shock Resistance Of Tbcsmentioning

confidence: 99%

“…Recently, many studies have been developed in the improvement of thermal shock resistance of TBCs, including cracked coatings, 13,14 gradient or multilayer coatings, [15][16][17] laser surface modification, [18][19][20] and so forth, by optimizing the spraying parameters or changing the coating composition and microstructure. Recently, the research on laser surface modification to prolonging thermal cycling lifetime of TBCs has received much attention.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Thermal Shock Resistance Of Tbcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Furthermore, the singularity of the stress at the coating-free edge also influences the failure of the coatings [118]. The broken regions usually occur at the horizontal and vertical cracks within the TC and TC/BC interfaces [17,[119][120][121][122][123].…”

Section: Enhanced Durability Of Ttbcsmentioning

confidence: 99%

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

et al. 2023

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Thermal barrier coatings (TBCs) are a fundamental technology used in high-temperature applications to protect superalloy substrate components. However, extreme high-temperature environments present many challenges for TBCs, such as the degradation of their thermal and mechanical properties. Hence, highly insulating, long-life TBCs must be developed to meet higher industrial efficiency. This paper reviews the main factors influencing the thermal insulation performance of TBCs, such as material, coating thickness, and structure. The heat transfer mechanism of the coating is summarized, and the degradation mechanism of the thermal insulation is analyzed from the perspective of the coating structure. Finally, the recent advances in improving the thermal insulation and lifetime of coatings are reviewed in terms of advanced materials and structural design, which will benefit advanced TBCs in future engineering applications and provide guidance for the next generation of high thermal insulating TBCs.

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Research progress of surface modification and solid–liquid lubrication synergistic friction reduction and wear resistance

Chen

Yang

et al. 2022

Int J Adv Manuf Technol

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Atmospheric plasma sprayed thick thermal barrier coatings: Microstructure, thermal shock behaviors and failure mechanism

Cited by 26 publications

References 46 publications

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

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

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

Research progress of surface modification and solid–liquid lubrication synergistic friction reduction and wear resistance

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