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Melting in refractory crucibles and related strength of near-gamma TiAl alloys
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SYSNO ASEP 0324576 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Melting in refractory crucibles and related strength of near-gamma TiAl alloys Title Tavení slitin na bázi gama TiAl v keramických kelímcích a jejich související pevnost Author(s) Dočekalová, Kateřina (UFM-A)
Válek, Robert (UFM-A)
Zemčík, L. (CZ)
Dlouhý, Antonín (UFM-A) RID, ORCIDSource Title 3rd International Workshop on Gamma-TiAl Technologies. - Nuernberg : GfE Nuernberg, 2006 / Volker G. ; Kim Y. - ISBN N Pages s. 1-20 Number of pages 20 s. Action International workshop on gamma-TiAl technologies /3./ Event date 28.05.2006-31.05.2006 VEvent location Bamberg Country DE - Germany Event type WRD Language eng - English Country DE - Germany Keywords vacuum induction melting ; refractory crucible ; gamma TiAl Subject RIV JG - Metallurgy R&D Projects 1QS200410502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GA106/04/0853 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation The present study focuses on reactions between ceramic crucibles and molten TiAl intermetallics. Coating strategies are investigated that exhibit a potential in slowing down the decomposition of the crucible wall. Uncoated crucibles (system TiAl melt - Al2O3 crucible) and crucibles with the coat (system TiAl melt - CaO coat - Al2O3 crucible) were used in melting and casting experiments. The reference state of the coated crucible before the melting trial was also investigated. Results of the SEM, EDAX and X-ray diffraction analysis contributed to the identification of the reaction zone and its chemical composition. The melt contamination with oxide inclusions results from the erosion process in which individual components of the melt diffuse along grain boundaries of the refractory and activate chemical reactions that decompose the crucible wall. Assessment of thermodynamic parameters associated with the chemical reactions helped in identifying the nature of the erosion process. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2009
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