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Experimental study of the phase relationships in the SrO-SiO2 system
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.ORCID-id: 0000-0002-3548-8638
2018 (engelsk)Inngår i: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, nr 9, s. 3354-3360Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The phase relationships in the SiO2-SrO system were determined experimentally using the quenching technique in the temperature range between 1573 K (1300 °C) and 1898 K (1625 °C). The phases in the quenched samples were examined and identified using light optical microscopy (LOM), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). The presence of solid phases and their nature were further confirmed using X-ray Diffraction (XRD). Based on the experimental results, the phase diagram was constructed. The phase diagram shows a congruent melting of the SrSiO3 at 1840 K (1567 °C). The eutectic between the SrSiO3, SiO2 and liquid happens at 1608 K (1335 °C) and 67 mol% SiO2 and the eutectic between the SrSiO3.

sted, utgiver, år, opplag, sider
Elsevier, 2018. Vol. 38, nr 9, s. 3354-3360
Emneord [en]
Experimental, Phase diagram, Quenching method, SrO-SiO2
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-227517DOI: 10.1016/j.jeurceramsoc.2018.03.030ISI: 000433014200036Scopus ID: 2-s2.0-85044335089OAI: oai:DiVA.org:kth-227517DiVA, id: diva2:1208931
Merknad

QC 20180521

Tilgjengelig fra: 2018-05-21 Laget: 2018-05-21 Sist oppdatert: 2019-03-29bibliografisk kontrollert
Inngår i avhandling
1. Studies of some thermodynamic aspects related to the production of silicon and ferrosilicon
Åpne denne publikasjonen i ny fane eller vindu >>Studies of some thermodynamic aspects related to the production of silicon and ferrosilicon
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis presents a fundamental study on some thermodynamic aspects regarding the silicon and ferrosilicon production. The purity requirements for silicon and ferrosilicon alloys are stringent. In order to achieve a successful and efficient refining of the silicon and ferrosilicon produced by carbothermic reduction, it is of great importance to know the phase relations in the system and to have reliable thermodynamic, kinetic and other physical data for the elements involved.

The first part of the thesis includes a study of different phase relationships of the SrO-SiO2 and SiO2-SrO-Al2O3 systems. Experiments were performed to determine the phase relationships at temperatures between 1300 °C and 1625 °C in the binary system and at 1450 °C, 1500 °C and 1600 °C in the ternary system. The present result would be valuable when determining the compositions of the refining slags. A fully liquid slag would ensure favorable kinetic conditions in the refining process.

The activities of some metallic elements in the silicon melt were determined in the second part of the thesis. The activities of Sr, Al, Zr and Ca in silicon were experimentally determined at temperatures that varied between 1450 °C and 1600 °C. These activities would provide useful information regarding the process temperature and the design of refining slags.

The third part of the thesis covers the study of the activities in a ferrosilicon alloy. The activity coefficients for Al and Ca in FeSi50 were experimentally determined by equilibrating SiO2-Al2O3-CaO slags with ferrosilicon at 1550 °C. The activities obtained would be very useful information for the optimization of the refining process.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2019. s. 64
Serie
TRITA-ITM-AVL ; 2019:13
HSV kategori
Forskningsprogram
Teknisk materialvetenskap
Identifikatorer
urn:nbn:se:kth:diva-247888 (URN)978-91-7873-157-2 (ISBN)
Disputas
2019-05-03, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-03-29 Laget: 2019-03-29 Sist oppdatert: 2019-03-29bibliografisk kontrollert

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