Optimized functionally graded La2Zr2O7/8YSZ thermal barrier coatings fabricated by suspension plasma spraying

Wang, Chaohui; Wang, You; Fan, Shanhui; You, Yang; Wang, Liang; Yang, Chaohe; Sun, Xiao‐Guang; Li, Xuewei

doi:10.1016/j.jallcom.2015.05.290

Cited by 60 publications

(15 citation statements)

References 42 publications

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“…On 5 the other hand, Wang et al also studied the thermal cyclic behavior of TBC system with graded coating, the single-layer and double-layer coatings. The thermal cyclic lifetime of the graded coating was extended than that of the single and double layer coatings [19].…”

Section: Introductionmentioning

confidence: 94%

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Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Song

Paik

Guo

et al. 2016

Surface and Coatings Technology

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The effects of microstructure design on the lifetime performance of lanthanum zirconate (La2Zr2O7; LZO) based thermal barrier coatings (TBCs) were investigated through various thermal exposure tests, such as furnace cyclic thermal fatigue, thermal shock, and jet engine thermal shock. To improve the thermal durability of LZO-based TBCs, composite top coats using two feedstock powders of LZO and 8 wt.% yttria doped stabilized zirconia (8YSZ) were prepared by mixing at different volume ratios (50:50 and 25:75, respectively). Also, buffer layers were introduced in layered LZO-based TBCs deposited by air plasma spray method. The TBCs with two buffer layers showed the best thermal shock resistance and thermal cyclic performance among all samples in all tests. For applications with mildly slow cooling rates, the thermal durability in single-layer TBCs is more effectively enhanced by controlling composite ratio in the blended powder, better than introducing a single buffer layer. For applications with fast cooling rates, the thermal durability can be effectively improved by introducing buffer layer than composite top coat, since buffer layer provides fast localized stress relief due to its high strain compliance. These research findings allow us to control the TBC structure and the buffer layer is efficient in improving thermal durability in the cyclic thermal exposure and thermal shock environments.

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Section: Introductionmentioning

confidence: 94%

“…Equivalent operating hour is a function of the operating hours, coefficient of correction, load rejection, equivalent hours for startup, trips, rapid load change, standby, fuel operation, etc. [19,22] Based on the EOH, the conservation and inspection interval units are performed rather than actual running hours:…”

Section: Furnace Cyclic Thermal Fatigue Testmentioning

confidence: 99%

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Song

Paik

Guo

et al. 2016

Surface and Coatings Technology

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“…It should be stressed that these tests carried out at 1390ºC, so out of the range of YSZ coating [90]. Different approach had Wang et al [91]. In their studies they used pyrochlore lanthanum zirconate (LZ) and YSZ.…”

Section: News In the Field Of Thermal Barrier Coatingsmentioning

confidence: 99%

“…18). Moreover, functionally graded architecture of coating allows to reduce thermal mismatch which appears between two ceramic [91]. Fig.…”

Section: News In the Field Of Thermal Barrier Coatingsmentioning

confidence: 99%

Thermal Barrier Coatings Manufactured by Suspension Plasma Spraying - A Review

Łatka

2018

Advances in Materials Science

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Thermal barrier coatings (TBC) is one of the most intensively studied of coatings’ applications area. From 1970’s TBC are developed in two independent ways: (i) development in new materials, with lower thermal conductivity, better erosion resistance and better thermal shock resistance or (ii) development in new deposition techniques. On this field besides conventional atmospheric plasma spraying (APS) and almost conventional (because of very common use) EB-PVD method, in the past 20 years two new techniques have been developed, namely suspension plasma spraying (SPS) and solution precursor plasma spraying (SPPS). In this paper only SPS method was described, as well as, new materials, which could be used in industrial applications of TBC. Moreover, the key issues, like suspension preparation, type of suspension injection, interaction between liquid droplets and plasma jet and deposition mechanism were described.

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“…The buffer layer as a stress accommodating layer during thermal cycling can also be designed with a double-layer coating (DLC) to reduce stress levels and ensure thermal durability [29,30]. Therefore, the YGYZ-based layered TBC system is believed to provide a good heat-insulating performance because the top coat is made of YGYZ material with intrinsic low thermal conductivity, and the layered structure improves the thermal durability, as the buffer layer between the top and bond coats reduces the CTE mismatch.…”

Section: Introductionmentioning

confidence: 99%

Thermal durability and fracture behavior of layered Yb-Gd-Y-based thermal barrier coatings in thermal cyclic exposure

Jung

et al. 2017

Surface and Coatings Technology

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The effects of structural design on the thermal durability of Yb-Gd-Y-based thermal barrier coatings (TBCs) were investigated through thermal cyclic exposure tests, such as furnace cyclic thermal fatigue (FCTF) and jet engine thermal shock (JETS) tests. The effects of composition in the bond coat and feedstock purity for the buffer layer on its lifetime performance were also examined. To overcome the drawbacks of Yb-Gd-Y material with poor thermal durability due to poor mechanical properties and low coefficient of thermal expansion, a buffer layer was introduced in the Yb-Gd-Y-based TBC systems. In the FCTF tests, the TBC with the CoNi-based bond coat and the buffer layer of regular purity showed a longer lifetime performance than other TBCs, especially the TBCs without the buffer layer.In the JETS tests, the TBC with the Ni-based bond coat and the buffer layer of high purity showed a sound condition after 2000 cycles, showing better interfacial stability for TBC with the Ni-based bond coat rather than that with the CoNi-based bond coat in the single layer coatings without the buffer layer. The buffer layer effectively enhanced the thermal durability in slow temperature change, while the bond-coat composition and the feedstock purity for the buffer layer were found to be important factor to improve the thermal durability of the TBC in fast temperature change. Finally, these research findings allow us to control the structure, composition, and feedstock purity in TBC system for improving the thermal durability in cyclic thermal environments.

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Optimized functionally graded La2Zr2O7/8YSZ thermal barrier coatings fabricated by suspension plasma spraying

Cited by 60 publications

References 42 publications

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Thermal Barrier Coatings Manufactured by Suspension Plasma Spraying - A Review

Thermal durability and fracture behavior of layered Yb-Gd-Y-based thermal barrier coatings in thermal cyclic exposure

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