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Brillo, J., Egry, I. & Matsushita, T. (2022). Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys. International Journal of Materials Research - Zeitschrift für Metallkunde, 97(11), 1526-1532
Open this publication in new window or tab >>Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 97, no 11, p. 1526-1532Article in journal (Refereed) Published
Abstract [en]

The densities of liquid copper, cobalt, and iron, their binary and ternary alloys have been measured over a temperature range including the undercooled regime. A non-contact technique was used, consisting of electromagnetic levitation combined with optical dilatometry. For all samples, the density was a linear function of temperature. The concentration dependence was studied by means of the excess volume which was negligible for Co- Fe and positive for Cu- Fe, Cu- Co, and Cu-Co - Fe. The density of the ternary alloy could be predicted from the excess volumes of the binary phases without the need to introduce any ternary interactions.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH, 2022
Keywords
Copper -cobalt, iron alloys, Electromagnetic levitation, Excess volume, Density, Liquid metals
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-308572 (URN)10.3139/ijmr-2006-0238 (DOI)000746425300008 ()2-s2.0-85124089226 (Scopus ID)
Note

QC 20220210

Available from: 2022-02-10 Created: 2022-02-10 Last updated: 2022-06-25Bibliographically approved
Brillo, J., Egry, I. & Matsushita, T. (2022). Density and surface tension of liquid ternary Ni-Cu-Fe alloys. International Journal of Materials Research - Zeitschrift für Metallkunde, 97(1), 28-34
Open this publication in new window or tab >>Density and surface tension of liquid ternary Ni-Cu-Fe alloys
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 97, no 1, p. 28-34Article in journal (Refereed) Published
Abstract [en]

Density and surface tension of liquid Ni -Cu -Fe alloys have been measured over a wide temperature range, including the undercooled regime. A non-contact technique was used, consisting of an electromagnetic levitator, an optical densitometer, and an oscillating drop tensiometer. At temperatures above and below the liquidus point, density and surface tension are linear functions of temperature. The concentration dependence of the density is significantly influenced by a third-order (ternary) parameter in the volume, while the surface tensions can be derived from the thermodynamic potentials (E)G of the binary phases alone.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH, 2022
Keywords
Electromagnetic levitation, Density, Surface tension, Liquid metals, Nickel, copper, iron alloys
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-307552 (URN)10.3139/ijmr-2006-0005 (DOI)000740393800005 ()
Note

QC 20220131

Not duplicate with DiVA: 333500 or 334208

Available from: 2022-01-31 Created: 2022-01-31 Last updated: 2022-06-25Bibliographically approved
Law, M., Hulme-Smith, C., Matsushita, T. & Jönsson, P. (2020). Assessment of Mechanisms for Particle Migration in Semi-Solid High Pressure Die Cast Aluminium-Silicon Alloys. Journal of manufacturing and materials processing, 4(51)
Open this publication in new window or tab >>Assessment of Mechanisms for Particle Migration in Semi-Solid High Pressure Die Cast Aluminium-Silicon Alloys
2020 (English)In: Journal of manufacturing and materials processing, ISSN 1042-6914, Vol. 4, no 51Article in journal (Refereed) Published
Abstract [en]

In semi-solid metal high pressure die casting and in conventional high pressure die casting, it is common to find a defect band just below the surface of the component. The formation of these bands is not fully understood. However, there are several theories as how they occur, and it has been suggested that segregation is caused by the migration of aluminium-rich externally solidified crystals. In the present work the formation of these bands is investigated theoretically by reviewing suitable potential mechanisms for the migration of such crystals. Two mechanisms are identified as the most probable: Saffman lift force and the Mukai-Lin-Laplace effect. However, it was not possible to identify which of these two mechanisms acted in the case studies. Further testing is required to identify the mechanism that is causing the migration of the aluminium globules and suitable tests are proposed.

Place, publisher, year, edition, pages
Basel, Switzerland: , 2020
Keywords
semi-solid metals; aluminium-silicon alloys; particle migration; high pressure die casting
National Category
Metallurgy and Metallic Materials
Research subject
Metallurgical process science
Identifiers
urn:nbn:se:kth:diva-278974 (URN)10.3390/jmmp4020051 (DOI)000591330900024 ()2-s2.0-85086397904 (Scopus ID)
Note

QC 20200819

Available from: 2020-08-07 Created: 2020-08-07 Last updated: 2024-03-15Bibliographically approved
Mostaghel, S., Matsushita, T., Samuelsson, C., Björkman, B. & Seetharaman, S. (2013). Influence of alumina on physical properties of an industrial zinc-copper smelting slag: Part 1 - Viscosity. Mineral Processing and Extractive Metallurgy: Transactions of the Institutions of Mining and Metallurgy: Section C, 122(1), 42-48
Open this publication in new window or tab >>Influence of alumina on physical properties of an industrial zinc-copper smelting slag: Part 1 - Viscosity
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2013 (English)In: Mineral Processing and Extractive Metallurgy: Transactions of the Institutions of Mining and Metallurgy: Section C, ISSN 0371-9553, E-ISSN 1743-2855, Vol. 122, no 1, p. 42-48Article in journal (Refereed) Published
Abstract [en]

The rotating cylinder method was applied to measure the viscosities of an industrial iron silicate slag and mixtures of this slag with 5, 10 and 15 wt-% alumina addition, in temperature range 1100-1300 C. The measured viscosities were compared with the predicted values using two of the commercially available software products for viscosity calculations, namely Thermoslag®1·5 and FactSageTM6·2. As the models can only predict viscosities for a solid free melt, obtained values by FactSageTM6·2 were modified using the Einstein-Roscoe equation. Results show that aluminium behaves as a network former cation in this type of slag, and by increasing the alumina concentration, the melt becomes progressively polymerised. Consequently, the viscosity of the slag increases at a given temperature, which is supported by thermodynamic predictions. According to the modified FactSage TM6·2 calculations, the viscosity of the solid containing slag increases from 2·1 to 5·5 poise at the industrial operating temperature (∼1250 C).

Keywords
FactSage, Rotating cylinder method, Thermoslag, Viscosity, Zinc slag fuming, Alumina concentration, Operating temperature, Rotating cylinders, Slag fuming, Thermodynamic predictions, Viscosity calculations, Alumina, Copper smelting, Cylinders (shapes), Industry, Silicates, Slags
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-134676 (URN)10.1179/1743285512Y.0000000029 (DOI)000210940100006 ()2-s2.0-84877140734 (Scopus ID)
Note

QC 20131209

Available from: 2013-12-09 Created: 2013-11-27 Last updated: 2024-03-15Bibliographically approved
Hara, K., Matsushita, T. & Nagata, K. (2013). In-situ X-ray Transmission Observation of Carbothermic Reduction of Magnetite Powder and Macroscopic Agglomeration of Reduced Iron. ISIJ International, 53(6), 1010-1019
Open this publication in new window or tab >>In-situ X-ray Transmission Observation of Carbothermic Reduction of Magnetite Powder and Macroscopic Agglomeration of Reduced Iron
2013 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 53, no 6, p. 1010-1019Article in journal (Refereed) Published
Abstract [en]

The agglomeration behaviour of reduced iron, made from magnetite powder by carbothermic reduction, was observed by using the in-situ X-ray transmission observation technique. The iron particles, above 1 mm, were clearly observed as black points. Further, the reduction speed was examined by using the thermogravimetric analysis. The bulk density of the packed powder layer and the grain size distribution of magnetite powder and carbon black powder were changed and the effects of them on the reduction speed and the agglomeration degree were examined. The agglomeration degree was evaluated with diameter of iron particles on the X-ray photographs, taken during heating, and the weight of collected iron particles after the observation experiments. Neither the bulk density of powder layer nor the grain size distribution of powder mixture affected to the reduction speed. The agglomeration degree decreased when the bulk density of the powder layer was increased by compacting. On the other hand, the agglomeration degree was increased when the grain size distribution of powder mixture was widened. Further, the height change of powder layer was also measured on the X-ray photographs and compared with the iron particles appearing behaviour to estimate the microscopic agglomeration behaviour. The mechanisms that grain size distribution affected the agglomeration degree were discussed.

Keywords
carbothermic reduction, ironmaking, X-ray observation, in-situ, agglomeration, powder
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-125781 (URN)10.2355/isijinternational.53.1010 (DOI)000320973600011 ()2-s2.0-84881331662 (Scopus ID)
Note

QC 20130814

Available from: 2013-08-14 Created: 2013-08-13 Last updated: 2024-03-15Bibliographically approved
Mostaghel, S., Holmgren, H., Matsushita, T. & Samuelsson, C. (2012). Integrated recycling at Boliden's Rönnskär Smelter; formation of slag products. In: International Smelting Technology Symposium: Incorporating the 6th Advances in Sulfide Smelting Symposium. Paper presented at International Smelting Technology Symposium, Incorporating the 6th Advances in Sulfide Smelting Symposium - TMS 2012 Annual Meeting and Exhibition;Orlando, FL;11 March 2012 through 15 March 2012 (pp. 117-124).
Open this publication in new window or tab >>Integrated recycling at Boliden's Rönnskär Smelter; formation of slag products
2012 (English)In: International Smelting Technology Symposium: Incorporating the 6th Advances in Sulfide Smelting Symposium, 2012, p. 117-124Conference paper, Published paper (Refereed)
Abstract [en]

Rönnskär Smelter of Boliden Mineral AB, Sweden, is a large end-processor of secondary raw materials and waste, including electronic scrap. Electronic scrap may introduce various impurities to the smelter's flow-sheet, among which alumina is a common and significant one. This article summarizes the results of an ongoing research at Luleå University of Technology, Sweden, to study the influences of alumina on different properties of slag from the zinc filming process at Rönnskär smelter. A combination of different experimental techniques and thermodynamic calculations have been used to investigate properties such as density, surface tension, effective thermal diffusivity, viscosity, and melting/leaching behaviors. Results show that the addition of alumina to this slag increases the degree of polymerization of the melt, and physical properties vary correspondingly. Mineralogy of the semi-rapidly solidified samples is also changed due to alumina addition. A correlation between mineralogy and leaching behavior can be observed.

Keywords
Electronic scrap, Iron-silicate slag, Recycling, Thermophysical properties
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-100053 (URN)2-s2.0-84860824115 (Scopus ID)978-111829116-0 (ISBN)
Conference
International Smelting Technology Symposium, Incorporating the 6th Advances in Sulfide Smelting Symposium - TMS 2012 Annual Meeting and Exhibition;Orlando, FL;11 March 2012 through 15 March 2012
Note

QC 20120803

Available from: 2012-08-03 Created: 2012-08-03 Last updated: 2024-03-15Bibliographically approved
Jönsson, P., Aune, R. E., Du, S., Teng, L., Matsushita, T. & Sundberg, S. (2012). The Seetharaman Seminar June 14-15, 2010 in Stockholm, Sweden. High Temperature Materials and Processes, 31(3), 193-193
Open this publication in new window or tab >>The Seetharaman Seminar June 14-15, 2010 in Stockholm, Sweden
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2012 (English)In: High Temperature Materials and Processes, ISSN 0334-6455, E-ISSN 2191-0324, Vol. 31, no 3, p. 193-193Article in journal, Editorial material (Other academic) Published
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-98727 (URN)10.1515/htmp-2012-0999 (DOI)000304979200001 ()2-s2.0-84866617932 (Scopus ID)
Note
QC 20120702Available from: 2012-07-02 Created: 2012-07-02 Last updated: 2024-03-15Bibliographically approved
Wunderlich, R. K., Fecht, H.-J. -., Egry, I., Etay, J., Battezzati, L., Ricci, E., . . . Seetharaman, S. (2012). Thermophysical Properties of a Fe-Cr-Mo Alloy in the Solid and Liquid Phase. Steel Research International, 83(1), 43-54
Open this publication in new window or tab >>Thermophysical Properties of a Fe-Cr-Mo Alloy in the Solid and Liquid Phase
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2012 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 1, p. 43-54Article in journal (Refereed) Published
Abstract [en]

Results of a thermophysical characterization of a Fe-Cr-Mo alloy in the solid and liquid phases are reported. Methods applied include calorimetry, dilatometry; the laser flash technique for thermal diffusivity measurement and ultrasound pulse echo for the measurement of the room temperature sound velocities and elastic constants. Density in the liquid phase and surface tension were measured by optical dilatometry and by the oscillating drop method on electromagnetic levitated specimen. In addition, surface tension and viscosity were measured by the oscillating drop method on board parabolic flights under reduced gravity conditions. The methods applied and results obtained are presented. This work represents a collaborative effort, including round robin measurements in different laboratories for a characterization of the basic thermophysical properties needed for process simulation.

National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-75525 (URN)10.1002/srin.201100156 (DOI)000298743000006 ()2-s2.0-84855383498 (Scopus ID)
Note
QC 20120206Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2024-03-15Bibliographically approved
Matsushita, T. & Watanabe, T. (2011). Dynamic in situ X-ray observation of a molten steel drop shape change in molten slag. Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy, 120(1), 49-55
Open this publication in new window or tab >>Dynamic in situ X-ray observation of a molten steel drop shape change in molten slag
2011 (English)In: Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy, ISSN 0371-9553, Vol. 120, no 1, p. 49-55Article in journal (Refereed) Published
Abstract [en]

In the present work, the interfacial reactions between molten synthetic slag (Al2O3-CaO-SiO2- FeO) and liquid iron alloy were investigated at 1873 K with the aid of an X-ray radiographic apparatus. The mother slag consists of 40 mass%CaO, 40 mass%SiO2 and 20 mass%Al2O3.FeO was added to this slag at the experimental temperature, and the movement of the droplet and deformation of the droplet shape were monitored in the dynamic mode. The change of the shape of the droplet is discussed based on the reaction and mass transfer at the slag/metal interface. From the movement of the droplet, interfacial velocity of the metal droplet induced by Marangoni flow was estimated and compared with the results obtained in the present laboratory earlier. The importance of surface velocity values on steel refining process simulations is discussed.

Keywords
Interfacial phenomena, Marangoni effect, Molten slag, Molten steel, X-ray observation, Drop breakup, Drop formation, Iron oxides, Liquid metals, Silicon compounds, Slags, Steel foundry practice, X ray radiography, X rays, Iron
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-151436 (URN)10.1179/037195510X12791826058172 (DOI)000210932600008 ()2-s2.0-79951780528 (Scopus ID)
Note

QC 20140922

Available from: 2014-09-22 Created: 2014-09-22 Last updated: 2024-03-15Bibliographically approved
Elfsberg, J. & Matsushita, T. (2011). Measurements and Calculation of Interfacial Tension between Commercial Steels and Mould Flux Slags. Steel Research International, 82(4), 404-414
Open this publication in new window or tab >>Measurements and Calculation of Interfacial Tension between Commercial Steels and Mould Flux Slags
2011 (English)In: Steel Research International, ISSN 1611-3683, Vol. 82, no 4, p. 404-414Article in journal (Refereed) Published
Abstract [en]

Surface quality of continuously cast is strongly influenced by the interfacial tension between steel and mould flux slag. The meniscus shape and the inclusion entrapment are directly determined by interfacial tension. To achieve a better understanding of the continuous casting process, the interface between four commercial steels and the mould fluxes used at the continuous casting of each steel grade have been investigated. The situation at this interface is determined by the surface tension of steel and slag respectively and also by the mass transfer occurring across the interface. The surface tensions of the mould flux slags have been measured by sessile drop method. The results indicate that the surface tension of mould flux slags decreases with increasing temperature but does not vary so much within the present composition range. Interfacial tensions between steel samples and mould flux slags have been measured in the same way with the aid of X-ray unit. Estimation of interfacial tension from the steel and slag composition was done by applying empirical models. The measured and the calculated values were in agreement. The interfacial tension was lower for higher alloyed steel grades according to both experiments and calculations though the influence of surface active elements is significant.

Keywords
continuous casting, interfacial tension, mould flux, steel, surface tension
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-33946 (URN)10.1002/srin.201000221 (DOI)000290050900013 ()2-s2.0-79953695055 (Scopus ID)
Note
QC 20110609Available from: 2011-06-09 Created: 2011-05-23 Last updated: 2024-03-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2929-7891

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