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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Interakce mezi Ti-Al-Nb taveninou a Y2O3 kelímky
 Barták, Tomáš ; Dlouhý, Antonín ; Dočekalová, Kateřina ; Zemčík, L.
The present paper focuses on interactions between intermetallic melts (Ti-46Al-7Nb-0.7Cr-0.1Si-0.2Ni alloy (at%)) and ceramic crucibles based on the Y2O3 refractory. Different levels of superheat and exposure time are taken into account. Vacuum induction melting (VIM) experiments were performed using the vacuum furnace BALZERS VSG 02. The controlled argon atmosphere inside the furnace volume was kept at the pressure level of 0.133 bar during the melting experiments. The reactions at the melt - crucible interface were studied by means of scanning electron microscopy (SEM) equipped with the energy dispersive x-ray analyzer (EDX). There has been clear benefit when a common refractory like alumina has been replaced by yttria. However, the results obtained in this study show, that the long - term exposure at melting temperatures above 1650°C lead to notable reactions at the interface. We discuss the stability of the melt - ceramic system using principles of thermodynamic equilibrium.
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Interaction between TiAl metl and coated ceramic crucibles
 Dočekalová, Kateřina ; Dlouhý, Antonín ; Zemčík, L. ; Fiala, J.
The present work focused on interactions between TiAl melt and coated oxide refractories. Melting experiments were performed in vacuum induction furnace (VIM technology). The attention is given mainly to reaction interfaces between the melt and ceramics, however, the microstructure of the cast alloy is also taken into account. The analysis is performed using scanning electron microscopy (SEM) and EDAX. Experimental results were compared with results of thermodynamic calculations that estimated a probability of chemical reactions at the melt-refractory interface. The results indicate that there is an influence of ceramic coatings on the cast microstructure. The detailed composition of the reaction interface and the explanation of reaction mechanisms based on thermodynamic calculations is presented.
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