Wettability of Solid Metals by Molten MnO-SiO2 Slag

Parry, G.; Ostrovski, Oleg

doi:10.1007/s11663-008-9180-4

Cited by 9 publications

(9 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13, and the contact angle was assumed to be 15°, an average contact angle value of the slag/Pt systems. 14,15) The surface tension correction was corresponding to 1.9-2.3% of the measured density.…”

Section: Methodsmentioning

confidence: 99%

Density Measurements of CaO^|^ndash;MnO^|^ndash;SiO2 Slags

2012

View full text Add to dashboard Cite

Density measurements of CaO-MnO-SiO2 slags were carried out using the Archimedean method. The density decreased with increasing temperature, and the negative temperature coefficient (-dρ/dT) was in the range of 1.46-3.10 × 10 -1 kg/m 3 K. At a fixed CaO content (25 wt%) and at a fixed SiO2 content (30 wt%), the density of CaO-MnO-SiO2 slag increased with increasing MnO content. The molar volumes of CaO, MnO and SiO2 at 1 773 K were estimated 21.0, 17.2, and 28.0 × 10 -6 m 3 /mol, respectively. The molar excess volume was expressed by , where Ω = -8.97 × 10 -6 m 3 /mol at 1 773 K. The thermal expansion coefficient decreased with increasing XSiO 2 because of the enhanced silicate network structure.KEY WORDS: Archimedean method; CaO-MnO-SiO2 slag; density; molar volume; silicate network structure; thermal expansion coefficient.

show abstract

Section: Methodsmentioning

confidence: 99%

Density Measurements of CaO^|^ndash;MnO^|^ndash;SiO2 Slags

2012

View full text Add to dashboard Cite

show abstract

“…The experiments were conducted in a graphite furnace described elsewhere. 6) A digital video camera with a resolution of 720ϫ576 pixels was used to record image sequences during the wettability experiments. Zoom lenses (one 4ϫ, one 1ϫ) were added to the camera lens to provide the correct focal length.…”

Section: Methodsmentioning

confidence: 99%

Wetting of Solid Iron, Nickel and Platinum by Liquid MnO–SiO2 and CaO–Al2O3–SiO2

Parry

Ostrovski

2009

ISIJ Int.

View full text Add to dashboard Cite

Wetting of solid metals-iron, nickel and platinum, by molten MnO-SiO 2 (MS) and CaO-Al 2 O 3 -SiO 2 (CAS) oxide systems was studied by the sessile drop method at 1 350-1 450°C in reducing atmosphere. Terminal contact angles (after 240 min) for MS system were: for iron substrates-5Ϯ2 deg at 1 350°C, 9Ϯ2 deg at 1 390°C, 6Ϯ2 deg at 1 450°C; platinum-15Ϯ2 deg at 1 350°C and 1 390°C, and 12Ϯ2 deg at 1 450°C. Contact angle for the Ni-MS system was close to zero-3Ϯ2 deg at 1 350°C and 1 390°C. Contact angles with CAS system were: iron-55Ϯ2 deg (1 350°C), 60Ϯ2 deg (1 390°C), 44Ϯ2 deg (1 450°C); nickel-59Ϯ2 deg (1 350°C), 60Ϯ2 deg (1 390°C); and platinum-15Ϯ2 deg (1 350°C, 1 390°C and 1 450°C). Work of adhesion for all substrates with MS system was 910 to 930 mJ/m 2 . Interfacial tension with MS system was 1 480 mN/m for Ni at 1 350 to 1 390°C, and 1 880 to 1 890 mN/m for Pt in the temperature range 1 350 to 1 450°C. For iron, interfacial tension was 1 720 mN/m at 1 350°C; 1 580 mN/m at 1 390°C and 1 450°C. Lower work of adhesion and higher interfacial tension were found for metals with CAS system. Reduction of MnO from MS system was observed, leading to Mn dissolution in metal substrates. Degree of silica reduction from MS system was much smaller in comparison with MnO reduction (negligible for Pt); it was very minor from CAS system. Reduction of oxides and adsorption of oxygen modify the metal-oxide interface, making wetting dynamic and profoundly affecting interfacial properties.KEY WORDS: interface wetting; interface dynamics; oxides. ExperimentalThe study is based upon in-situ observation of high-temperature wettability of a solid metal by molten oxides using the sessile drop method. In these experiments, the change in behavior with time and temperature of a liquid drop of oxide upon a solid metal substrate was recorded. The experiments were conducted in a graphite furnace described elsewhere. 6)A digital video camera with a resolution of 720ϫ576 pixels was used to record image sequences during the wettability experiments. Zoom lenses (one 4ϫ, one 1ϫ) were added to the camera lens to provide the correct focal length. Welding lenses were placed in between the camera and the furnace window to reduce glare from the sample at high temperatures.Iron was obtained in the form of chips (2 mm diameter). Approximately 1 g of iron chips were melted in an alumina crucible under a Varigon (5 vol% hydrogen, 95 vol% argon) atmosphere at 1 600°C. Nickel was obtained as ϳ1 g pellets. The iron or nickel was placed inside an envelope of titanium foil for rolling to a thickness close to 1 mm, giving a diameter of ϳ15 mm. After rolling, the metal disc was polished down to a roughness of 0.05 mm.Platinum was supplied in the form of foil of 0.5 mm thickness then polished to the same finish as iron and nickel. Chemical analysis of iron, nickel and platinum by Inductively-Coupled Plasma spectroscopy and LECO analyzers (CS-244 Carbon/Sulfur and TC-436DR Oxygen/ Nitrogen) is given in Table 1.The MnO-SiO 2 (MS) system was prepared from MnO (99...

show abstract

“…The experimental setup and experimental procedure were presented elsewhere. [1] Manufacturing of metal substrates and their chemical analysis were also given in previous work. [1] The CaO-SiO 2 -Al 2 O 3 slag was prepared from silica (99.995 wt pct) and alumina (99.8 wt pct) powder; CaO was produced by calcining CaCO 3 powder (99+ wt pct) in a muffle furnace.…”

Section: Methodsmentioning

confidence: 99%

“…[1] Manufacturing of metal substrates and their chemical analysis were also given in previous work. [1] The CaO-SiO 2 -Al 2 O 3 slag was prepared from silica (99.995 wt pct) and alumina (99.8 wt pct) powder; CaO was produced by calcining CaCO 3 powder (99+ wt pct) in a muffle furnace. The mixture of pure oxides was melted in a platinum foil crucible in a muffle furnace at 1500°C, and then crushed using a tungsten carbide rod mill to particles of mass 0.01 to 0.02 g. Results of the XRF chemical analysis are given in Table I.…”

Section: Methodsmentioning

confidence: 99%