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Evaluation of Titanium Nitride-Modified Bondcoat System Used in Thermal Barrier Coating in Corrosive Salts Environment at High Temperature

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Abstract

Thermal barrier coating (TBC) systems were produced by air plasma spraying system on nickel base superalloy. These coatings were composed of a Y2O3-stabilized ZrO2 topcoat and a CoNiCrAlY bondcoat and are known as standard TBC. In this paper, standard TBC samples were compared with TiN-modified bondcoat TBC samples. Titanium nitride was deposited by utilizing a physical vapor deposition technique. Both TBC systems were exposed to high temperature in the presence of corrosive salts, i.e. a mixture of V2O5 and Na2SO4 (50:50) for 50 h. It was observed that the TiN-modified samples showed better results in terms of oxidation resistance and delamination. The formation of Cr2Ti n−2O2n−1 phases at the interface of the topcoat–bondcoat, in TiN-modified samples were found to enhance the thermal and oxidation properties of the TBC.

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Authors and Affiliations

  1. School of Chemical and Materials Engineering, National University of Sciences and Technology, Islamabad, Pakistan

    Imran Nazir Qureshi & Muhammad Shahid

  2. Institute of Industrial and Control System, Rawalpindi, Pakistan

    A. Nusair Khan

  3. University of Engineering and Technology, Taxila, Pakistan

    Yaseer A. Durrani

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  1. Imran Nazir Qureshi
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  2. Muhammad Shahid
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  3. A. Nusair Khan
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  4. Yaseer A. Durrani
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Correspondence to Imran Nazir Qureshi.

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Qureshi, I.N., Shahid, M., Nusair Khan, A. et al. Evaluation of Titanium Nitride-Modified Bondcoat System Used in Thermal Barrier Coating in Corrosive Salts Environment at High Temperature. J Therm Spray Tech 24, 1520–1528 (2015). https://doi.org/10.1007/s11666-015-0344-x

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