The effect of SiO2/Al2O3and TiO2/SiO2ratios on the viscosity of the TiO2-MnO-SiO2-Al2O3welding flux system was studied using the rotational spindle method. The viscosity was measured at the fully liquid region of the melt from 1 773 K to the break temperature at approximately 1 623 K. Higher TiO2/SiO2ratio resulted in lower viscosity in the temperature range of interest. The SiO2dominant slag system showed higher viscosity values than the Al2O3dominant slag in the present TiO2based system until a SiO2/Al2O3ratio of 1.61. Fourier transform infrared (FTIR) results revealed the [SiO4]4--tetrahedral symmetric stretching vibrations and the [AlO4]5--tetrahedral asymmetric stretching vibration became weaker with higher TiO2/ SiO2, which was also apparent with the increase in the extended basicity ((TiO2+MnO)/(SiO2+Al2O3)). The Al-O-Si bending vibration and [SiO4]4--tetrahedral symmetric stretching vibrations were also pronounced with higher SiO2/Al2O3ratio. From the X-ray photoelectron spectroscopy (XPS) results, the bridged oxygen (O0) slightly decreased with higher TiO2/SiO2and increased with higher SiO2/Al2O3.
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© 2014 ISIJ.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry