Influence of the Al2O3/SiO2 mass ratio and gas composition on the viscous behavior and structure of Cr-containing stainless steel slags

Zhanjun Wang; Il Sohn

doi:10.1016/j.ceramint.2019.09.048

Influence of the Al₂O₃/SiO₂ mass ratio and gas composition on the viscous behavior and structure of Cr-containing stainless steel slags

Zhanjun Wang, Il Sohn

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

This study investigated the effects of the Al₂O₃/SiO₂ mass ratio and gas composition on the viscosity and structure of Cr-containing CaO-SiO₂-MgO-Al₂O₃-CrO_x stainless steel slags. The wet chemical analysis method was used to identify the Cr³⁺/Cr²⁺ ratio, and XPS (X-ray photoelectron spectroscopy) and ²⁷Al MAS NMR (magic angle spinning nuclear magnetic resonance) were used to correlate the structural units comprising the melt to the viscosity measurements. The results showed that the break temperature (T_Br) corresponded to the temperature when the crystallization fraction increased rapidly. When the Al₂O₃/SiO₂ mass ratio was in the range between 0.125 and 1.0, the viscosity gradually increased as the Al₂O₃/SiO₂ mass ratio increased. Similar viscosity trends were observed for gas compositions with higher oxygen partial pressures, which was correlated to an increased degree of polymerization (DOP) of the slag structure. In addition, the variation in the Cr³⁺/Cr²⁺ ratio, which decreased with increasing Al₂O₃/SiO₂ mass ratios and increased with higher oxygen partial pressures, correlated well with the viscous behavior of the slags, the variation trends of [AlO₄]- and [AlO₅]-structural units, and the increased DOP of the slags.

Original language	English
Pages (from-to)	903-912
Number of pages	10
Journal	Ceramics International
Volume	46
Issue number	1
DOIs	https://doi.org/10.1016/j.ceramint.2019.09.048
Publication status	Published - 2020 Jan

Bibliographical note

Funding Information:
This work was supported by the third stage of the Brain Korea 21 Plus Project of the Division of Creative Materials in 2018 and the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2018R1A2B2006609 ).

Funding Information:
This work was supported by the third stage of the Brain Korea 21 Plus Project of the Division of Creative Materials in 2018 and the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2018R1A2B2006609).

Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2019.09.048

Cite this

@article{92805c39731c48adabc989203fd2568e,

title = "Influence of the Al2O3/SiO2 mass ratio and gas composition on the viscous behavior and structure of Cr-containing stainless steel slags",

abstract = "This study investigated the effects of the Al2O3/SiO2 mass ratio and gas composition on the viscosity and structure of Cr-containing CaO-SiO2-MgO-Al2O3-CrOx stainless steel slags. The wet chemical analysis method was used to identify the Cr3+/Cr2+ ratio, and XPS (X-ray photoelectron spectroscopy) and 27Al MAS NMR (magic angle spinning nuclear magnetic resonance) were used to correlate the structural units comprising the melt to the viscosity measurements. The results showed that the break temperature (TBr) corresponded to the temperature when the crystallization fraction increased rapidly. When the Al2O3/SiO2 mass ratio was in the range between 0.125 and 1.0, the viscosity gradually increased as the Al2O3/SiO2 mass ratio increased. Similar viscosity trends were observed for gas compositions with higher oxygen partial pressures, which was correlated to an increased degree of polymerization (DOP) of the slag structure. In addition, the variation in the Cr3+/Cr2+ ratio, which decreased with increasing Al2O3/SiO2 mass ratios and increased with higher oxygen partial pressures, correlated well with the viscous behavior of the slags, the variation trends of [AlO4]- and [AlO5]-structural units, and the increased DOP of the slags.",

author = "Zhanjun Wang and Il Sohn",

note = "Funding Information: This work was supported by the third stage of the Brain Korea 21 Plus Project of the Division of Creative Materials in 2018 and the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2018R1A2B2006609 ). Funding Information: This work was supported by the third stage of the Brain Korea 21 Plus Project of the Division of Creative Materials in 2018 and the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2018R1A2B2006609). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd and Techna Group S.r.l.",

year = "2020",

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N2 - This study investigated the effects of the Al2O3/SiO2 mass ratio and gas composition on the viscosity and structure of Cr-containing CaO-SiO2-MgO-Al2O3-CrOx stainless steel slags. The wet chemical analysis method was used to identify the Cr3+/Cr2+ ratio, and XPS (X-ray photoelectron spectroscopy) and 27Al MAS NMR (magic angle spinning nuclear magnetic resonance) were used to correlate the structural units comprising the melt to the viscosity measurements. The results showed that the break temperature (TBr) corresponded to the temperature when the crystallization fraction increased rapidly. When the Al2O3/SiO2 mass ratio was in the range between 0.125 and 1.0, the viscosity gradually increased as the Al2O3/SiO2 mass ratio increased. Similar viscosity trends were observed for gas compositions with higher oxygen partial pressures, which was correlated to an increased degree of polymerization (DOP) of the slag structure. In addition, the variation in the Cr3+/Cr2+ ratio, which decreased with increasing Al2O3/SiO2 mass ratios and increased with higher oxygen partial pressures, correlated well with the viscous behavior of the slags, the variation trends of [AlO4]- and [AlO5]-structural units, and the increased DOP of the slags.

AB - This study investigated the effects of the Al2O3/SiO2 mass ratio and gas composition on the viscosity and structure of Cr-containing CaO-SiO2-MgO-Al2O3-CrOx stainless steel slags. The wet chemical analysis method was used to identify the Cr3+/Cr2+ ratio, and XPS (X-ray photoelectron spectroscopy) and 27Al MAS NMR (magic angle spinning nuclear magnetic resonance) were used to correlate the structural units comprising the melt to the viscosity measurements. The results showed that the break temperature (TBr) corresponded to the temperature when the crystallization fraction increased rapidly. When the Al2O3/SiO2 mass ratio was in the range between 0.125 and 1.0, the viscosity gradually increased as the Al2O3/SiO2 mass ratio increased. Similar viscosity trends were observed for gas compositions with higher oxygen partial pressures, which was correlated to an increased degree of polymerization (DOP) of the slag structure. In addition, the variation in the Cr3+/Cr2+ ratio, which decreased with increasing Al2O3/SiO2 mass ratios and increased with higher oxygen partial pressures, correlated well with the viscous behavior of the slags, the variation trends of [AlO4]- and [AlO5]-structural units, and the increased DOP of the slags.

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