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The Influence of ZrO2 Concentration in an Yttria-Based Face Coat for Investment Casting a Ti-45Al-2Mn-2Nb-0.2TiB Alloy Using a Sessile Drop Method

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Abstract

Investment casting is widely used to cast near-net shape components, reducing material waste and process cost. Due to the high reactivity of titanium and its alloys, in order to reduce the interaction between the mold and molten titanium, very costly materials are used in the mold face coat. In order to reduce the material cost while maintaining the chemical inertness of the face coat, ZrO2 was added into an yttria-based face coat in different concentrations in this study. The face coat properties of the different systems were analyzed using dilatometry and XRD. The chemical inertness of the different face coat systems were tested using a sessile drop test using a Ti-45Al-2Mn-2Nb-0.2TiB alloy, and the interactions between the face coat and the alloy were analyzed by the interfacial microstructures, contact angle, and hardness changes. The results showed that small amounts of ZrO2 can be added into yttria without changing the chemical inertness of the face coat. High amounts of ZrO2 in the face coat can interact with TiAl alloy to form different interaction products. Meanwhile, both Y2O3 and ZrO2 filler materials were observed to dissolve in molten TiAl during the sessile drop test.

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Acknowledgments

The authors would like to thank Rolls-Royce plc for financial support to this program, and all the Research Fellows and Technicians in the Casting Group in the School of Metallurgy and Materials are gratefully acknowledged for their practical support.

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Authors and Affiliations

  1. School of Material Science and Engineering, Beihang University, No. 37 Xue Yuan Street, Haidian District, Beijing, 100192, P.R. China

    Xu Cheng (Post Doctor)

  2. School of Chemical Engineering, The University of Birmingham, Birmingham, B15 2TT, UK

    Xu Cheng (Post Doctor) & Stuart Blackburn (Professor)

  3. School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, UK

    Chen Yuan (Research Fellow) & Paul A. Withey (Professor)

  4. Rolls-Royce plc, PO BOX 31, Derby, DE24 8BJ, UK

    Paul A. Withey (Professor)

Authors
  1. Xu Cheng
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  2. Chen Yuan
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  3. Stuart Blackburn
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  4. Paul A. Withey
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Corresponding author

Correspondence to Xu Cheng.

Additional information

Manuscript submitted July 6, 2014.

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Cheng, X., Yuan, C., Blackburn, S. et al. The Influence of ZrO2 Concentration in an Yttria-Based Face Coat for Investment Casting a Ti-45Al-2Mn-2Nb-0.2TiB Alloy Using a Sessile Drop Method. Metall Mater Trans A 46, 1328–1336 (2015). https://doi.org/10.1007/s11661-014-2724-0

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