Continuous thermogravimetric analysis during the cyclic oxidation of Ni–22Al–15Pt+1wt.% Hf at 1200°C

Kartono, R.; Monceau, Daniel; Young, David J.

doi:10.1016/j.scriptamat.2007.06.018

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…isothermal oxidation, can be interesting to observe in their heating part or cooling parts for better know oxidation during heating or oxide spallation during cooling, as sometimes done in earlier studies, for example among the most recent ones: [7][8][9][10][11][12]. In the heating part, the thermogravimetric results can be firstly perturbed at low temperature by the establishing thermal equilibrium (seen on the thermogravimetric curve corresponding to an inert alumina sample as well as the real samples of alloys), and thereafter, at higher temperatures, only by the Archimedes' thrust decrease (e.g.…”

Section: Discussionmentioning

confidence: 99%

Oxidation Start Detection on Heating Parts of Thermogravimetry Curves for High Temperature Alloys Based on Nickel, Cobalt or Iron

Berthod¹

2011

TOCORRJ

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Abstract:The heating parts of thermogravimetry curves performed for cast alloys in air at high temperatures were analysed, after correction from the effects of air buoyancy variation, to characterize the transient oxidation before reaching the targeted temperature for the isothermal stage usually applied thereafter. This was done here for three binary M-30Cr alloys, six ternary M-30Cr-0.4 and 0.8%C alloys, and three M-30Cr-0.4C-6Ta quaternary alloys, heated in synthetic air at 20 K min-1 until 1000, 1100 or 1200°C. The cobalt alloys begin to be oxidized with a sufficient mass gain to be detected by thermogravimetry, earlier than the nickel or iron alloys (i.e. at lower temperatures). The temperature of oxidation start is lowered by the presence of tantalum for the three families of alloys. When the carbon content (or the carbides density) increases in the alloy, the temperature of oxidation start decreases for the cobalt alloys and remains almost constant for the nickel or iron alloys, while the total mass gain due to oxidation during heating increases for the nickel and cobalt alloys and decreases for the iron alloys.

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Section: Discussionmentioning

confidence: 99%

Oxidation Start Detection on Heating Parts of Thermogravimetry Curves for High Temperature Alloys Based on Nickel, Cobalt or Iron

Berthod¹

2011

TOCORRJ

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“…Thermogravimetry is more destined for specifying the oxidation rates in isothermal conditions, than for analyzing the following oxide spallation. Nevertheless this technique was successfully used in numerous previous works for characterizing oxide spallation, for example, among the most recent studies, in the case of refractory austenitic steels [5,6] or of alumina-forming nickel alloys [7] thermally cycled.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Study of Oxide Spallation for Chromium-Rich Cast Cobalt-Based and Iron-Based Alloys Oxidized at High Temperature

Berthod¹

2009

TOCORRJ

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During temperature cycles, metallic alloys for high temperature applications are usually oxidized with formation of an external protective oxide scale, but they loose it during the cooling. This problem of oxide spallation can be studied by specific tests of cyclic oxidation but first indications can be provided by analyzing the cooling parts of thermogravimetry curves. This possibility was studied in this work for simple {Co or Fe}-30 wt.% Cr alloys containing between 0 and 0.8 wt.% of carbon, and for two of these alloys after addition of about 5 wt.% of tantalum. These alloys, elaborated by foundry process, were exposed to oxidation at 1000, 1100 or 1200°C for 50 hours, with recording of their mass gain during heating, isothermal dwell and cooling. The analysis of the cooling part of the thermogravimetry files allowed specifying several data characterizing the spallation of the external oxide, such as the temperature at which the phenomenon begins and the rate with which the mass decreases because of the loss of oxide. Metallographic data about oxidation and spallation were obtained by examination of cross-sections of the oxidized samples. Oxide spallation, characterized by its beginning's temperature and its corresponding mass loss rate, was obviously more severe for the cobalt alloys than for the iron ones, for the carbon-free alloys than for carbides-containing ones and for tantalum-containing alloys than for the tantalum-free ones. Most of these effects were explained.

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Mechanisms and Kinetics of Oxidation

Chevalier

2010

Shreir's Corrosion

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Continuous thermogravimetric analysis during the cyclic oxidation of Ni–22Al–15Pt+1wt.% Hf at 1200°C

Cited by 6 publications

References 16 publications

Oxidation Start Detection on Heating Parts of Thermogravimetry Curves for High Temperature Alloys Based on Nickel, Cobalt or Iron

Oxidation Start Detection on Heating Parts of Thermogravimetry Curves for High Temperature Alloys Based on Nickel, Cobalt or Iron

Thermogravimetric Study of Oxide Spallation for Chromium-Rich Cast Cobalt-Based and Iron-Based Alloys Oxidized at High Temperature

Mechanisms and Kinetics of Oxidation

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