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Characterization of the interfaces formed at the silicon nitride superalloy joints

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Abstract

In this study, silicon nitride ceramics (Si3N4) were joined by using a capacitor discharge technique with an Inconel 718 superalloy interlayer and heat-treated in order to determine possible reactions between these two materials. After capacitor discharge joining, some of the samples were heat-treated at 1100 °C under air and the resulting interfacial microstructure was characterized by using a scanning electron microscope (SEM) attached with an energy-dispersive x-ray spectrometer (EDS) and wavelength dispersive x-ray spectrometer (WDS). According to back-scattered electron images (BSE), all the joining samples were well bonded through the interlayer and cracks were not observed along the interlayer, interface and the ceramics. According to point SEM–EDS and SEM–WDS analysis, the reaction layer and nitrogen (N) were not detected but a small amount of silicon (Si) and aluminium (Al) was detected at the interlayer of as-joined samples. For the heat-treated samples at 1100 °C, the symmetrical reaction layer was observed at both sides of the interlayer which is expanding towards the ceramic side and approximately 25-nm-thick another continuous reaction layer next to this was also determined. According to SEM–EDS and SEM–WDS point-line scan analysis along the metallic interface and ceramic side, nickel (Ni), iron (Fe) and chromium (Cr) were detected at the reaction layer next to the ceramic side, whereas mainly Cr, niobium (Nb), molybdenum (Mo), titanium (Ti) and Al were concentrated at the 25-nm-thick reaction layer.

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Acknowledgements

We would like to express our gratitude to the Anadolu University Scientific Research Projects Commission for their support to the project numbered 030217 and titled “Kapasitör deşarj tekniği ile çok katmanlı seramiklerin üretilmesi ve metal-seramik arayüzey reaksiyonlarının belirlenmesi”.

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Authors and Affiliations

  1. Faculty of Aeronautics and Astronautics, Anadolu University, TR-26480, Eskisehir, Turkey

    Orkun Tunçkan & Dilek Turan

  2. Faculty of Engineering, Department of Materials Science and Engineering, Anadolu University, 26555, Eskisehir, Turkey

    Aydın Doğan & Servet Turan

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  1. Orkun Tunçkan
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  2. Dilek Turan
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  3. Aydın Doğan
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  4. Servet Turan
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Correspondence to Orkun Tunçkan.

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Tunçkan, O., Turan, D., Doğan, A. et al. Characterization of the interfaces formed at the silicon nitride superalloy joints. J Aust Ceram Soc 53, 83–89 (2017). https://doi.org/10.1007/s41779-016-0012-8

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  • DOI: https://doi.org/10.1007/s41779-016-0012-8

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