Vacuum induction melting of near-gamma TiAl intermetallic alloys

• Autorzy: Zemčik L. , Dlouhy A. , Dočekalova K.
• Języki publikacji: EN

Abstrakty

EN

The present study focuses on vacuum induction melting of near-gamma TiAl intermetallic alloys. The attention is mainly given to a cost-effective melting process in which a primary alloy ingot is re-melted in a ceramic crucible and cast into a ceramic shell mould. To be able to melt successfully gamma TiAl intermetallics it is absolutely necessary to solve the fundamental metallurgical problems associated with the evaporation of aluminium from the melt, with the reactions between the melt and the refractories of crucibles, and with the reactions between the melt and residual gases in the furnace chamber. The paper deals with the physical and chemical analyses of the above processes and gives their evaluation based on the results of experimental melts obtained in vacuum induction furnace. The most detrimental reactions that govern the contamination of the molten alloy with ceramic particles were determined. Results suggest that the crucible wall attack can be considerably limited by using crucibles with a suitable coating.

Słowa kluczowe

EN

TiAl intermetallies; vacuum induction melting; ceramic crucibles

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2007
• Tom: Vol. 7, nr 4(14)
• Strony: 121--126
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Zemčik L.

autor

Dlouhy A.

autor

Dočekalova K.

• Brno University of Technology, Faculty of Mechanical Engineering, Department of Foundry Engineering, Brno, Czech Republic

Bibliografia

• 1. Mi J., Harding R.A., Wickins M., Campbell J.: Entrained oxide films in TiAI castings. Intermetallics 11 (2003), pp. 377-385.
• 2. Zemcik L., Dlouhy A., Malec S.: Processing of gamma TiAl intermetalic castings. Proc. 2nd International Conference & Exhibition. [CD-ROM]. Associazione Italiana di Metallurgia Milano, 2004.
• 3. Zemcik L., Dlouhy, A.: Processing of Gamma TiAl Intermetallics from the Viewpoint of Physics and Physical Chemistry. Proc. European Congress on Advanced Materials, their Processes and Applications „Materials Week 2002". [CD-ROM]. Deutsche Geselschaft fir Materialkunde e.V. Frankfurt, 2002.
• 4. Guo, J. et al. Evaparation behaviour of Aluminium during the Cold Crucible induction skull melting of titanium aluminium alloys. Metallurgical and Materials Transactions B 31 B (2000), pp.837-844.
• 5. Maeda M. et al. Activity of aluminum in molten Ti-Al alloys. Materials Science and Engineering A 239-240 (1997), pp. 276-280.
• 6. Dlouhy, A., Docekalova, K., Zemcik, L. Vacuum Induction Melting and Investment Casting Technologies Tailored to Near-Gamma TiAl Alloys. Materials Science Forum 539-543 (2007), pp. 1463-1468.
• 7. Das K., Choudhury P., Das S. Aluminum-Oxygen-Titanium System. Journal of Phasc Equilibria 23 (2002), pp. 525-536.
• 8. Guo, J. et al. The critical Pressure and Impending Pressure of Al Evaporation during Induction Skull Melting Processing of TiAl. Metallurgical and Materials Transactions A 33A (2002), pp. 3249-3253.