Elektrochemische Bestimmung der Diffusionskonstanten des Sauerstoffs in flüssigem Kupfer

Osterwald, Jörg; Schwarzlose, Gert

doi:10.1524/zpch.1968.62.1_4.119

Cited by 25 publications

(5 citation statements)

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“…Fig. 5 compares the results with those of previous workers, [13][14][15][16][17][18] whose lines are extrapolated (shown dotted) to the higher temperatures covered in the present study. Previous workers covered the lower ranges 1150-1400°C, 13 1100-1350°C, 14 1100-1250°C 15 and 1100-1350°C.…”

Section: Resultssupporting

confidence: 61%

“…18 Of the upper five lines in Fig. 5, indirect electrochemical methods were used by Osterwald and Schwarzlose, 14 Rickert and El Miligy 15 and Oberg et al, 18 and direct diffusion from a source of oxygen followed by analysis of the resultant oxygen contents in the copper specimen was employed only in the work of Kleist 13 and that reported here. Fig.…”

Section: Resultsmentioning

confidence: 94%

“…In the present study the diffusion coefficients of oxygen in liquid copper and in liquid nickel were determined between 1300°and 1560°C by use of a capillary-gas reservoir technique. This direct gas-liquid contact method is more relevant to actual liquid metal processing than cooler, indirect electrolytic methods [13][14][15][16][17][18] (cited later in Fig. 5).…”

Section: Synopsismentioning

confidence: 99%

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Diffusion of oxygen in liquid copper and nickel

Hocking¹

2000

Mineral Processing and Extractive Metallurgy

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 94%

Section: Synopsismentioning

confidence: 99%

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Diffusion of oxygen in liquid copper and nickel

Hocking¹

2000

Mineral Processing and Extractive Metallurgy

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“…The diffusion coefficient is independent of oxygen concentration (30). From the average of two recent independent studies (31,32), Do • 104 in copper is 0.74, 0.98, and 1.27 cm2/sec at 1100 ~ 1200 ~ and 1300~ respectively. Converting concentrations to g-atoms/cm 3 using the densities of liquid silver (33) and copper (34) enables effective diffusion layer thick- nesses to be found.…”

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confidence: 92%

Voltammetric Determination of Oxygen in Liquid Metals Using Solid Oxide Electrolytes

Etsell

Flengas

1972

J. Electrochem. Soc.

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Dissolved oxygen was electrochemically reduced in cells of the type (--) O(in M)/ZrO2-CaO/O2 (4-) where M was either silver or copper. Impervious ZrO2 4-10 m/o (mole per cent) CaO electrolyte tubes were immersed in the liquid metal. The dependence of current on immersion depth, applied potential, time, dissolved oxygen concentration, temperature, and the amplitude and frequency of vibration of the electrolyte was studied. The electrode reactions are reversible. At sufficiently high applied potentials, diffusion overpotential appears at the liquid metal electrode and, for small depths of immersion, limiting currents are eventually realized. They are directly proportional to the concentration of dissolved oxygen meaning that voltammetric measurements could be used to determine the dissolved oxygen content of liquid metals. This proportionality was verified from 0.002 to 0.15 a/o (atomic per cent) O in silver between 1000 ~ and 1200~ and from 0.005 to 0.13 a/o O in copper between 1100 ~ and 1300~ Effective diffusion layer thicknesses are about 0.05 cm." Electrochemical Society Active Member.

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“…So, the diffusivity of oxygen has been determined only in liquid iron (4), lead(5), silver (6) and copper (7), which have a comparatively weak affinity with oxygen. And much scattering was observed in the experimental results and some of them are assumed to be less reliable.…”

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Determination of the Diffusivity of Oxygen in Liquid Silver by Electrochemical Measurements

Otsuka

Kozuka

1974

Trans. JIM

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Following the preceding work, the present study was made in order to find a new method for the measurement of oxygen diffusivity in liquid metal. Using the electrochemical cell, Ar(1% O2),O(in liquid silver)/ZrO2(+CaO)/Ar(1 % O2), the diffusivity of oxygen in liquid silver was determined by newly developed potentiostatic titration and e.m.f. methods.The potentiostatic titration experiment was undertaken by the same procedure as in the previous work except some improvements in the experimental technique. Another e.m.f. experiment was undertaken as follow. Potentiostatic titration was continued until a steady state was obtained and then the change in e.m.f. was measured after electric current was cut off. The diffusivity of oxygen was determined from the change in e.m.f. according to the following relation;The results obtained by the above two different methods were in good agreement with the previous results. However the activation energy determined by the e.m.f. method was a little larger than that by the potentiostatic titration method. These experimental results showed that the oxygen diffusivity in liquid metal could be determined accurately by these electrochemical methods. And these experimental methods may be recommended, in particular, for the metal which has a strong affinity with oxygen.

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Elektrochemische Bestimmung der Diffusionskonstanten des Sauerstoffs in flüssigem Kupfer

Cited by 25 publications

References 0 publications

Diffusion of oxygen in liquid copper and nickel

Diffusion of oxygen in liquid copper and nickel

Voltammetric Determination of Oxygen in Liquid Metals Using Solid Oxide Electrolytes

Determination of the Diffusivity of Oxygen in Liquid Silver by Electrochemical Measurements

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