Carbide layer growth behaviour in a molybdenum coating on graphite at elevated temperatures

Isobe, Y.; Son, P.; Miyake, Masanobu

doi:10.1016/0022-5088(89)90199-9

Cited by 14 publications

(2 citation statements)

References 4 publications

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“…Consistently the activation energy given in the literature for the diffusion of carbon in molybdenum carbide of 2.5 eV [18] is significantly lower.…”

Section: Carbide Layer Growthsupporting

confidence: 89%

Kinetics of carbide formation in the molybdenum–tungsten coatings used in the ITER-like Wall

et al. 2016

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The kinetics of tungsten carbide formation was investigated for tungsten coatings on CFC with a molybdenum interlayer as they are used in the ITER-like Wall in JET. The coatings were produced by combined magnetron sputtering and ion implantation. The investigation was performed by preparing focused ion beam cross sections from samples after a heat treatment in argon atmosphere. Baking of the samples was done at temperatures of 1100°C, 1200°C, and 1350°C for hold times between 30 minutes and 20 hours. It was found that the data can be well described by a diffusional random walk with a thermally activated diffusion process. The activation energy was determined to be (3.340.11) eV. Predictions for the isothermal lifetime of this coating system were computed from this information.

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“…Consistently the activation energy given in the literature for the diffusion of carbon in molybdenum carbide of 2.5 eV [18] is significantly lower.…”

Section: Carbide Layer Growthsupporting

confidence: 89%

Kinetics of carbide formation in the molybdenum–tungsten coatings used in the ITER-like Wall

et al. 2016

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“…7 the apparent activation energy (E A ) of the growth process was calculated. E A was estimated to be equal to 34 Kcal/mol (142.3 KJ/mol), which is close to the values found in the literature [31,35,36].…”

Section: Iii1 Molybdenum Carbide Formationsupporting

confidence: 87%

Full Densification of Molybdenum Powders Using Spark Plasma Sintering

Mouawad

Soueidan

Fabrègue

et al. 2012

Metall Mater Trans A

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Pure molybdenum powder was sintered using Spark Plasma Sintering under various temperatures, and holding times, under a pressure of 77 MPa and a heating rate at 700°C/min. After sintering, a carbide layer was observed at the surface. The carbide layer thickness, the relative density of the sample as well as the microhardness and the grain size of Mo were measured. The carbide thickness depends on time and temperature and it was found that the carbide layer grows in a parabolic manner, with the activation energy of carbon diffusion in Mo being equal to 34 Kcal/mol. The densification of Mo is controlled mainly by the sintering temperature and the holding time. The molybdenum powder was successfully consolidated by SPS in short times. A relative density of 100% is achieved at a sintering temperature of 1850°C and a holding time of 30 minutes. It was shown that the hardness decreases slightly with temperature and time. It should be related to the increase in grain size with the sintering temperature and time.

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ChemInform Abstract: Carbide Layer Growth Behavior in a Molybdenum Coating on Graphite at Elevated Temperatures

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Carbide layer growth behaviour in a molybdenum coating on graphite at elevated temperatures

Cited by 14 publications

References 4 publications

Kinetics of carbide formation in the molybdenum–tungsten coatings used in the ITER-like Wall

Kinetics of carbide formation in the molybdenum–tungsten coatings used in the ITER-like Wall

Full Densification of Molybdenum Powders Using Spark Plasma Sintering

ChemInform Abstract: Carbide Layer Growth Behavior in a Molybdenum Coating on Graphite at Elevated Temperatures

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