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Thermodynamics of hydrogen in electroslag remelting Chattopadhyay, Subrata
Abstract
Oxide ion activities in binary CaF₂ - CaO and ternary, CaF₂ -CaO - Al₂O₃ and CaF₂ - CaO -SiO₂, slags were determined by CO₂-slag equilibrium experiments at 1400°C. The carbonate capacity of these slags was computed and compared with the sulfide1 capacity data available in the literature. The similarity in their trends suggests the possibility of characterizing carbonate capacity as an alternative basicity index for fluoride-based slags. The optical basicity of these slags is difficult to define, and with the assumption of CaF₂ as an inert diluent, this parameter did not show any distinct relationship with carbonate capacity. Slag-D20 equilibrium experiments were performed at 1400°C with binary ( CaF₂ - CaO ) and ternary ( CaF₂ - CaO - Al₂O₃ and CaF₂ - CaO -SiO₂) slags to determine water solubility at two different partial pressures of D₂O. A new technique of slag sampling was employed using a quartz tube. A new and reliable method of water analysis in ESR slags was developed. The new water solubility data were higher than the previous data by an order of magnitude, however, the solubility data showed a linear relationship with the square root of water vapour partial pressure. Also, the solubility was at a maximum in binary slags and a minimum in ternary slags containing SiO₂ with N[sub CaO]/N[sub SiO₂]≤2. These experimental findings were used along with literature data to generate a new equilibrium ratio for hydrogen distributed between the slag and the metal during an ESR process. This information was further extended to compute the maximum permissible water content in an initial ESR slag for the production of an ESR ingot with an acceptable level of hydrogen.
Item Metadata
| Title |
Thermodynamics of hydrogen in electroslag remelting
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| Creator | |
| Publisher |
University of British Columbia
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| Date Issued |
1986
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| Description |
Oxide ion activities in binary CaF₂ - CaO and ternary, CaF₂ -CaO - Al₂O₃ and CaF₂ - CaO -SiO₂, slags were determined by CO₂-slag
equilibrium experiments at 1400°C. The carbonate capacity of these slags
was computed and compared with the sulfide1 capacity data available in the
literature. The similarity in their trends suggests the possibility of
characterizing carbonate capacity as an alternative basicity index for
fluoride-based slags. The optical basicity of these slags is difficult to
define, and with the assumption of CaF₂ as an inert diluent, this parameter
did not show any distinct relationship with carbonate capacity. Slag-D20
equilibrium experiments were performed at 1400°C with binary ( CaF₂ -
CaO ) and ternary ( CaF₂ - CaO - Al₂O₃ and CaF₂ - CaO -SiO₂) slags to
determine water solubility at two different partial pressures of D₂O. A new
technique of slag sampling was employed using a quartz tube. A new and
reliable method of water analysis in ESR slags was developed. The new
water solubility data were higher than the previous data by an order of
magnitude, however, the solubility data showed a linear relationship with the
square root of water vapour partial pressure. Also, the solubility was at a
maximum in binary slags and a minimum in ternary slags containing SiO₂
with N[sub CaO]/N[sub SiO₂]≤2.
These experimental findings were used along with literature data to generate a new equilibrium ratio for hydrogen distributed between the slag and the metal during an ESR process. This information was further extended to compute the maximum permissible water content in an initial ESR slag for the production of an ESR ingot with an acceptable level of hydrogen.
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| Genre | |
| Type | |
| Language |
eng
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| Date Available |
2010-07-30
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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| DOI |
10.14288/1.0078430
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
|
| Campus | |
| Scholarly Level |
Graduate
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| Aggregated Source Repository |
DSpace
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For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.