TY - GEN

T1 - Fundamental investigations for the design of fluorine free mold powder compositions

AU - Marschall, Irmtraud

AU - Yang, Xiao

AU - Harmuth, Harald

PY - 2016/5/22

Y1 - 2016/5/22

N2 - 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.

AB - 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.

KW - fluorine free

KW - mold powder

KW - crystallization

U2 - DOI: 10.1002/9781119333197.ch32

DO - DOI: 10.1002/9781119333197.ch32

M3 - Conference contribution

SP - 299

BT - Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts

A2 - Reddy, Ramana G

A2 - Chaubal, Pinakin

A2 - Pistorius, P.Chris

A2 - Pal, Uday

CY - Seattle Washington USA

T2 - The 10th international conference on molten slags, fluxes and salts

Y2 - 22 May 2016 through 25 May 2016

ER -