Pen Academic Publishing   |  ISSN: 2602-4810   |  e-ISSN: 2602-4535

Orjinal Araştırma Makalesi | Uluslararası Fen Araştırmalarında Yenilikçi Yaklaşımlar Dergisi 2019, Cil. 3(2) 20-40

On the CMAS Problem in Thermal Barrier Coatings: Benchmarking Thermochemical Resistance of Oxides Alternative to YSZ Through a Microscopic Standpoint

Çağan Berker İyi, Martha Mecartney & Daniel R. Mumm

ss. 20 - 40   |  DOI: https://doi.org/10.29329/ijiasr.2019.197.1   |  Makale No: MANU-1903-27-0004.R1

Yayın tarihi: Haziran 28, 2019  |   Okunma Sayısı: 29  |  İndirilme Sayısı: 95


Özet

This study focuses on experimental modelling of the failure of Thermal Barrier Coatings (TBCs) due to attack of CMAS (Calcia-Magnesia-Alumina-Silicate), which is often found in harsh environments, via glassy phase infiltration. Volcanic ash and dust, sand particles, and fly ash, which contain CMAS, are imminent threats impeding predictable lifetimes of TBCs. Such incurrence directly affects the geometry and clinging to bond coat, and intrinsic material properties such as thermal conductivity and crystal structure of TBC are modified after exposure to CMAS, which ultimately results in delamination, spallation and failure of the coating material. The scope of this work is to survey the reactivity of CMAS with various oxide systems, and evaluate possible oxide systems that can be replaced and/or used with Yttria-stabilized Zirconia (YSZ) by investigating the penetration depth and reactivity after sintering with CMAS. A cost-effective method to observe the reaction of candidate oxides with CMAS is suggested and administired; understanding the main mechanism that causes the failure of top coat in the wake of CMAS infiltration, and seeking solutions for the problem is performed by taking advantage of Scanning Electron Microscopy (SEM). Recently suggested ceramic oxide systems that form in pyrochlore structure, some perovskite structures in various compositions, monazite, mullite and YSZ are studied. The possible outcome consequent upon CMAS infiltration are concluded and course for designing novel material systems that are expected to withstand the CMAS attacks better than the state-of-the-art 4mole% YSZ is defined. 5% mole Yb-doped SrZrO3(5Yb-SZ) and favored pyrochlores such as Gd2r2O7 and GdYbZr2O7 are found to be better mitigating CMAS attacks.

Anahtar Kelimeler: CMAS, thermal barrier coating, perovskite, pyrochlore, glassy phase infiltration


Bu makaleye nasıl atıf yapılır?

APA 6th edition
Iyi, C.B., Mecartney, M. & Mumm, D.R. (2019). On the CMAS Problem in Thermal Barrier Coatings: Benchmarking Thermochemical Resistance of Oxides Alternative to YSZ Through a Microscopic Standpoint . Uluslararası Fen Araştırmalarında Yenilikçi Yaklaşımlar Dergisi, 3(2), 20-40. doi: 10.29329/ijiasr.2019.197.1

Harvard
Iyi, C., Mecartney, M. and Mumm, D. (2019). On the CMAS Problem in Thermal Barrier Coatings: Benchmarking Thermochemical Resistance of Oxides Alternative to YSZ Through a Microscopic Standpoint . Uluslararası Fen Araştırmalarında Yenilikçi Yaklaşımlar Dergisi, 3(2), pp. 20-40.

Chicago 16th edition
Iyi, Cagan Berker, Martha Mecartney and Daniel R. Mumm (2019). "On the CMAS Problem in Thermal Barrier Coatings: Benchmarking Thermochemical Resistance of Oxides Alternative to YSZ Through a Microscopic Standpoint ". Uluslararası Fen Araştırmalarında Yenilikçi Yaklaşımlar Dergisi 3 (2):20-40. doi:10.29329/ijiasr.2019.197.1.

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