Morphology, bond strength and thermal cycling behavior of (Ni, Pt)Al/YSZ EB-PVD thermal barrier coatings

Xu, Zhenhua; Wang, Zhankao; Huang, Guanghong; Mu, Rende; He, Limin

doi:10.1016/j.jallcom.2015.08.113

Cited by 22 publications

(10 citation statements)

References 27 publications

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“…The EB-PVD TBCs have disadvantages of high cost and high thermal conductivity (Fig. 1c) [18][19] . The PS-PVD has a different deposition mechanism as compared with the traditional processes, which can avoid these weaknesses to some extent.…”

Section: Challenges Of Ps-pvd 7ysz Tbcsmentioning

confidence: 99%

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A solution to the challenges of particle erosion and thermal cycle for PS-PVD 7YSZ thermal barrier coatings

Zhang

et al. 2021

Preprint

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Advanced aero-engine is a key technique that is used all over the world, where many high-temperature components such as turbine blades and combustor, are made of Ni/Co/Fe based superalloys. However, they need high-temperature protection to avoid fast performance degradation. Generally, the superalloy high-temperature components are protected by thermal barrier coatings (TBCs) obtained via an atmospheric plasma spray (APS) and an electron beam-physical vapor deposition (EB-PVD). Here, a novel 3rd generation TBCs process using plasma spray-physical vapor deposition (PS-PVD) is presented, showing a more promising use than the traditional APS and EB-PVD. The PS-PVD feature uses evaporating ceramic powder, which results in the deposition of a feather-like columnar coating. This special microstructure showed good strain tolerance and non-line-of-sight (NLOS) deposition, giving great potential for application. In a working aero-engine, the high-temperature components face a serious environment, where foreign particle erosion is a great challenge and is the first barrier to the application of PS-PVD TBCs. As a solution, an Al-modification approach was proposed in this investigation. The results demonstrate that this approach can improve particle erosion resistance. Also, the thermal cycle performance had an apparent optimization.

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Section: Challenges Of Ps-pvd 7ysz Tbcsmentioning

confidence: 99%

“…[16][17] . The EB-PVD TBCs have a columnar structure obtained via vapor-deposited atoms, and they face the challenges of high cost and high thermal conductivity [18][19] . The PS-PVD process can avoid these limitations to some extent.…”

Section: Introductionmentioning

confidence: 99%

A solution to the challenges of particle erosion and thermal cycle for PS-PVD 7YSZ thermal barrier coatings

Zhang

et al. 2021

Preprint

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“…The first layer is a metallic bond coat made of MCrAlY overlay coating or diffusional aluminide coating modified with elements such as platinum.The second layer is known as thermally grown oxide (α-Al 2 O 3 ). The third layer, namely topcoat, is a ceramic material mostly zirconia stabilized with 6-8 weight percent of yttria [3][4][5][6]. The ceramic topcoats may be coated with either thermal spray (TS) or electron beam physical vapor deposition (EB-PVD).…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and cyclic oxidation of Pt-Al-YSZ coating under thermal shock

Rabieifar¹,

Nategh²,

Afshar³

et al. 2020

Mater. Res. Express

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In this research, the effect of thermal shock has been investigated on the microstructure and cyclic oxidation of Pt-Al-7%YSZ coating applied on Rene-80 superalloy. The microstructural evaluation and phase identification were performed by field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). The thermal shock test consisted of repeated cycles of rapid cooling between 900°C and 400°C. Prior to the thermal shock test, the specimen coated by Pt-electroplating, high-activity low-temperature (HALT) aluminizing and the thermal spray of YSZ ceramic layer. From surface towards the substrate; the coating consisted of 5 layers including: 7% YSZ, PtAl 2 +β-(Ni,Pt)Al, β-(Ni,Pt)Al with fine precipitates rich in α-(Cr) and α-(W), precipitate-free β-NiAl, and inter-diffusion zone next to the specimen surface. After the thermal shock test, spallation and delamination have been observed in the YSZ layer. The Pt-Al layer was found in upper and lower parts of the coating with different Pt concentration. Also, the chemical composition of the Pt-Al layer demonstrated the removal of PtAl 2 particles and β transformation to both γ and γ′ phases. Degradation of Pt-Al layer occurred by ratcheting the thermally grown oxide (TGO), rumpling, and cavitation. Comparison of weight changes showed that the thermal shock resistance is improved by Pt-Al-7% YSZ coating.

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“…A thermal barrier coating (TBC) is one of the ceramic coatings that is used on components or parts of a system to give an optimum protection to the system from the highest and most extreme operation temperature conditions. When TBC is deposited on certain components or parts, the heat that penetrates through it can be reduced as well as protect the system from damage and can also lengthen the lifetime of the components [1]. TBCs have been extensively used in high temperature applications such as in modern gas turbines and aircrafts in order to improve engine efficiency by enabling further increase of temperature during operation.…”

Section: Introductionmentioning

confidence: 99%

The Thermal Conductivity of 8 Yttria Stabilized Zirconia and Mullite Thermal Barrier Coating on Medium Carbon Steel Substrate

Zaini*,

Adenan*,

Saedon

et al. 2019

IJEAT

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Thermal conductivity is one of the main features of a thermal barrier coating (TBC) that is important in making sure that the TBC gives its best functionality to the system. A good TBC has low thermal conductivity, so that the temperature can drop across the coating which allows the system to operate in extremely high temperatures. There are several factors that can influence the thermal conductivity of the TBC such as the type of ceramic material used, the deposition method and the physical features of the TBC itself. For this research, air plasma spray (APS) is used to deposit 8 wt% yttria stabilized zirconia (8YSZ) and mullite on medium carbon steel substrates to study their respective thermal conductivities. The aim here is to develop a heat shield using TBC to protect the electric motor in an electrical turbocompounding system. The characteristics of the deposited TBC such as microstructure, element composition, phases and thermal conductivity are studied. The thermal conductivity is reduced when medium carbon steel substrate deposited with TBC. The thermal conductivity of 8YSZ, mullite and uncoated sample at minute 60 is 0.868 W/mK, 0.903 W/mK and 1.057 W/mK, respectively. Therefore, the deposition of 8YSZ TBC can lower the thermal conductivity of the medium carbon steel heat shield.

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Morphology, bond strength and thermal cycling behavior of (Ni, Pt)Al/YSZ EB-PVD thermal barrier coatings

Cited by 22 publications

References 27 publications

A solution to the challenges of particle erosion and thermal cycle for PS-PVD 7YSZ thermal barrier coatings

A solution to the challenges of particle erosion and thermal cycle for PS-PVD 7YSZ thermal barrier coatings

Microstructural evolution and cyclic oxidation of Pt-Al-YSZ coating under thermal shock

The Thermal Conductivity of 8 Yttria Stabilized Zirconia and Mullite Thermal Barrier Coating on Medium Carbon Steel Substrate

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