Liquidus Temperature of Mould Fluxes in Casting of Ti-stablized Stainless Steel

2013 ◽  
Vol 32 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Qifeng Shu ◽  
Zhen Wang ◽  
Kuochih Chou
Keyword(s):  
Experimental Data ◽  
Thermal Analysis ◽  
Stainless Steel ◽  
Differential Thermal Analysis ◽  
Liquidus Temperature ◽  
Temperature Determination ◽  
Dta Curves ◽  
Liquidus Temperatures

AbstractLiquidus temperatures of mould fluxes for casting of Ti-stabilized stainless steel were determined by differential thermal analysis (DTA) techniques in the present work. Multiple DTA curves were employed to guarantee better accuracy for liquidus temperature determination. To investigate effect of compositions change on solidification of mould fluxes during casting of Ti-stabilized stainless steel, changes of liquidus and solidus temperatures with TiO2 substitution for SiO22 in mould fluxes were studied. It was found that TiO2 substitution for SiO22 in mould fluxes would lead to decrease of liquidus temperature. Thermodynamic package FactSage was also employed to calculate the liquidus temperature of mould fluxes. The calculated results were compared with experimental data, and discrepancy between calculated and experimental liquidus temperatures was discussed.

Effect of Na3WO3F3 Content on the Liquidus Temperature of NaCl-KCl-Na3WO3F3 Molten Salt System

2014 ◽  
Vol 908 ◽  
pp. 159-162
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Ya Bin Liu ◽  
Yun Gang Li
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Molten Salt ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Eutectic Temperature ◽  
Salt System ◽  
Molten Salt System

The liquidus temperature of molten salt NaCl-KCl-Na3WO3F3 system was measured by differential thermal analysis. The results show that in the molten salt system when XNaCl:XKCl=1:1, XNa3WO3F3<0.6 the liquidus temperature decreased with increase of Na3WO3F3 content; when XNaCl:XKCl=1:1, XNa3WO3F3> 0.6 the liquidus temperature increased with the increase of Na3WO3F3 content; the eutectic temperature is 612.9 °C, the eutectic composition is XNaCl=0.2, XKCl=0.2, XNa3WO3F3=0.6.

Vacuum Carburization of Nanometer Tungsten Powder with Carbon Black

2007 ◽  
Vol 534-536 ◽  
pp. 165-168 ◽  
Author(s):  
Luo Ji ◽  
Lin Tao ◽  
Zhi Meng Guo ◽  
Cheng Chang Jia
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Surface Area ◽  
Tungsten Powder ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Vacuum Carburization ◽  
Dta Curves

Vacuum carburization of nanometer tungsten powder was investigated in a simple designed apparatus. An X-Y recorder was used to plot differential thermal analysis (DTA) curves to determine the starting temperature of carburization of four samples with different specific surface area. The product was characterized by X-ray Diffraction (XRD) and small angle X-ray scattering (SAXS). The results show that finer tungsten powder has lower starting temperature of carburization. Tungsten powder, the BET surface area of which is 32.97m2/g, was completely carburized to tungsten carbide at 1050°C, even though the starting temperature was 890°C. The particle was found to grow sharply before carburization.

Crystal Growth in Amorphous Binary Alloys of Zr-Ni System

2007 ◽  
Vol 26-28 ◽  
pp. 675-678 ◽  
Author(s):  
Takeshi Fukami ◽  
I. Noda ◽  
M. Asada ◽  
D. Okai ◽  
T. Yamasaki
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Crystal Growth ◽  
Crystallization Process ◽  
Isothermal Annealing ◽  
Binary Alloys ◽  
Isothermal Condition ◽  
Amorphous State ◽  
Dta Curves

A crystallization process in an amorphous state under isothermal condition is examined for binary alloys ZrNi and ZrNi2 by differential thermal analysis (DTA). Time dependence of DTA curves is measured at several constant temperatures just below crystallization temperature. The fraction of crystallized volume in amorphous state and its time evolution during isothermal annealing are measured. These data are analyzed by the Johnson-Mehl–Avrami formula. The Avrami exponent is 2.4±0.1 for ZrNi and 3~4 depending on the set temperature for ZrNi2. The activation energy for crystallization of amorphous ZrNi and ZrNi2 was estimated by plots of lnt1/2 vs. 1/T.

scholarly journals Differential thermal analysis of Kharidhunga magnesite

1991 ◽  
Vol 7 ◽  
Author(s):  
Vishnu Dangol
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Analysis ◽  
The Other ◽  
Sharp Rise ◽  
Magnesite Deposit ◽  
Dta And Tg ◽  
Dta Curves ◽  
Representative Samples

The DTA curves of seven representative samples from the Kharidhunga Magnesite Deposit arc asymmetric and show a sharp rise after attaining the maxima between 670 and 700 oC, which indicates the siliceous nature of the magnesite. The overlapped endothermic peaks al 770 oC and 860 oC characterize the presence of calcite and dolomite respectively as the other impurities. The results of DTA and TG are also compared with the available data of chemical analysis.

Effect of NaWO3F Content on the Liquidus Temperature of NaCl-KCl-NaWO3F Molten Salt System

2014 ◽  
Vol 909 ◽  
pp. 41-44
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Ya Bin Liu ◽  
Yun Gang Li
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Molten Salt ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Eutectic Temperature ◽  
Salt System ◽  
Molten Salt System ◽  
F System

The liquidus temperature of molten salt NaCl-KCl-NaWO3F system was measured by differential thermal analysis. The results show that in the molten salt system when :=1:1, XNaWO3F <0.5 the liquidus temperature decreased with the increase of NaWO3F content; when :=1:1, XNaWO3F>0.5 the liquidus temperature increased with the increase of NaWO3F content; the eutectic temperature is 615.9 °C, the eutectic composition is =0.25, =0.25, XNaWO3F=0.5.

Effect of WO3 Content on the Liquidus Temperature of NaCl-KCl-NaF-WO3 Molten Salt System

2014 ◽  
Vol 909 ◽  
pp. 54-57 ◽  
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Ya Bin Liu ◽  
Yun Gang Li
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Molten Salt ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Eutectic Temperature ◽  
Salt System ◽  
Molten Salt System

The liquidus temperature of molten salt NaCl-KCl-NaF-WO3 system was measured by differential thermal analysis. The results show that in the molten salt system when 0.1379 eutectic temperature is 616.5 °C, eutectic composition is =0.3846, =0.3846, =0.1923, =0.0385; when >0.1379, eutectic temperature is 628.9 °C, eutectic composition is = 0.3390, = 0.3390, =0.1695, = 0.1525.

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