Effect of dissolved oxygen on the surface tension of liquid iron

Murarka, R.; Lu, W.-K.; Hamielec, A. E.

doi:10.1179/000844375795050337

Cited by 20 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 4 shows the comparison of the present value of ΓO sat with those reported by several investigators. [19][20][21][23][24][25][26] The value of ΓO sat obtained in this study is in good agreement with the data reported by Kasama et al 19) and Nakashima et al. 20) Assuming that the oxygen adsorption is a monolayer, the area, AO, occupied by an adsorbed oxygen atom on the surface is expressed by the following equation: The following discussion has been made on the adsorbed oxygen layer on the melt surface using this value.…”

Section: Oxygen Adsorption On Surface Of Liquid Ironsupporting

confidence: 88%

Surface Tension of Liquid Iron as Functions of Oxygen Activity and Temperature

et al. 2011

View full text Add to dashboard Cite

Surface tension of liquid iron is an important property for process simulations evaluating Marangoni flow in the melt. In this study, we succeeded to measure accurate surface tension of liquid iron under various oxygen activities and temperatures with overcoming experimental difficulties through the following attempts: (1) To prevent chemical contamination of sample, an oscillating droplet method using an electromagnetic levitator was employed. Surface oscillation frequencies were determined with taking into account sample rotation. (2) To control the oxygen activity of liquid iron, a gas-liquid equilibrium method using CO/CO2 containing gas mixtures was employed. This method enables precise control of oxygen activity with keeping carbon activity low, and therefore, oxygen activity dependence of surface tension was clarified without carbon effect. (3) To measure the surface tension for higher oxygen activities up to the Fe/FeO equilibrium, high-purity iron (99.9972 mass%) was used. Otherwise, minor reactive impurities in the melt such as aluminum are oxidized, which affects the surface tension measurement. Based on the experimental data, the surface tension of liquid iron was expressed as functions of oxygen activity and temperature using the Szyszkowski model. In addition, thermodynamic properties on the oxygen adsorption reaction and structure of the adsorbed oxygen layer on the melt surface were also discussed.

show abstract

Section: Oxygen Adsorption On Surface Of Liquid Ironsupporting

confidence: 88%

Surface Tension of Liquid Iron as Functions of Oxygen Activity and Temperature

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Indeed, the characterization of oscillation modes in levitated droplets is a well-established technique for the measurement of surface energy. [19][20][21][22][23] We take a similar approach, with radial variation described as [3] where r 0 is the mean radius of the melt pool, n is the n th mode amplitude of oscillation, t is time, n is the n th mode angular frequency, and Y nm are the spherical harmonics. We r(t) ϭ r 0 ϩ n Y nm sin (v n t) consider the axisymmetric modes (Y n ) for which the angular frequency is given by [4] where is the surface energy and M is the mass of the oscillating liquid.…”

Section: Further Results Analysis and Discussionmentioning

confidence: 99%

The role of melt pool behavior in free-jet melt spinning

Napolitano

Meco

2004

Metall Mater Trans A

View full text Add to dashboard Cite

The influence of melt pool behavior on the competition between the nucleation of crystalline solidification products and glass formation is examined for an Fe-Si-B alloy. High-speed imaging of the melt pool, analysis of ribbon microstructure, and measurement of ribbon geometry and surface character all indicate upper and lower limits for melt spinning (MS) rates for which fully amorphous ribbons can be achieved. Comparison of the relevant time scales reveals that surface-controlled melt pool oscillation may be the dominant factor governing the onset of unsteady thermal conditions accompanied by varying amounts of crystalline nucleation observed near the lower limit. At high rates, the influence of these oscillations is minimal due to very short melt pool residence times. However, microstructural evidence suggests that the entrapment of gas pockets at the wheel-metal interface may play a critical role in establishing the upper rate limit. An observed transition in wheel-side surface character with an increasing MS rate supports this contention. The Role of Melt Pool Behavior in Free-Jet Melt Spinning R.E. NAPOLITANO and H. MECOThe influence of melt pool behavior on the competition between the nucleation of crystalline solidification products and glass formation is examined for an Fe-Si-B alloy. High-speed imaging of the melt pool, analysis of ribbon microstructure, and measurement of ribbon geometry and surface character all indicate upper and lower limits for melt spinning (MS) rates for which fully amorphous ribbons can be achieved. Comparison of the relevant time scales reveals that surface-controlled melt pool oscillation may be the dominant factor governing the onset of unsteady thermal conditions accompanied by varying amounts of crystalline nucleation observed near the lower limit. At high rates, the influence of these oscillations is minimal due to very short melt pool residence times. However, microstructural evidence suggests that the entrapment of gas pockets at the wheel-metal interface may play a critical role in establishing the upper rate limit. An observed transition in wheel-side surface character with an increasing MS rate supports this contention.

show abstract

“…Therefore, surface tension values given in the literature scatter widely, especially for high-melting metals. To overcome these problems, the electromagnetic levitation technique for determining the surface tension of molten metals was first introduced by Lu and co-workers [8][9][10]. The principle of the electromagnetic oscillation droplet technique is based on the general theory Paper presented at the Fourth International Workshop on Subsecond Thermophysics, June 27-29, 1995, K61n, Germany.…”

Section: Introductionmentioning

confidence: 99%

A new variant for measuring the surface tension of liquid metals and alloys by the oscillating drop method

et al. 1996

View full text Add to dashboard Cite

The theoretical background of the oscillating drop technique for measuring surface tension is briefly presented and the different analysis procedures are cited. A new method is described for obtaining oscillation frequencies by fast fourier transformation (FFT) of the pyrometer voltage signals from temperature measurements at the top of the levitated sample. The results on the first experiments on liquid nickel are in a good agreement with the literature data.

show abstract

Effect of dissolved oxygen on the surface tension of liquid iron

Cited by 20 publications

References 8 publications

Surface Tension of Liquid Iron as Functions of Oxygen Activity and Temperature

Surface Tension of Liquid Iron as Functions of Oxygen Activity and Temperature

The role of melt pool behavior in free-jet melt spinning

A new variant for measuring the surface tension of liquid metals and alloys by the oscillating drop method

Contact Info

Product

Resources

About