Fundamental investigations for the design of fluorine free mold powder compositions

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The influence of the CaO/SiO2 ratio on flux viscosity at 1300°C, break temperature and crystallization was investigated.
The thermo-chemical software FactSage was used for the calculation of the viscosity, the equilibrium phase content and the liquidus temperature. Based on these results, two sample series with 8.8 wt% TiO2, 5 wt% B2O3 and CaO/SiO2 ratios from 0.8-1.2 were manufactured. Series M1 contained Li2O which was replaced by a higher content of Na2O for F-free mixtures in series M2. The viscosity and break temperature were determined through rotational viscometry, the crystallization temperature and crystalline fraction by a so called Furnace Crystallization Test, a macro style differential thermal analysis which enables a mineralogical investigation of the samples afterwards.
The experiments exhibited that the break temperature, the liquidus temperature and the crystalline fraction rose with increasing C/S ratio while the viscosity decreased for both sequences.
Original languageEnglish
Title of host publicationAdvances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts
EditorsRamana G Reddy, Pinakin Chaubal, P.Chris Pistorius, Uday Pal
Place of PublicationSeattle Washington USA
Pages299
Number of pages306
ISBN (Electronic)978-1-119-30876-8
DOIs
Publication statusPublished - 22 May 2016
EventThe 10th international conference on molten slags, fluxes and salts - Seattle, United States
Duration: 22 May 201625 May 2016

Conference

ConferenceThe 10th international conference on molten slags, fluxes and salts
Abbreviated titleMOLTEN 2016
Country/TerritoryUnited States
CitySeattle
Period22/05/1625/05/16

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