Continuous Thermogravimetry Under Cyclic Conditions

Monceau, Daniel; Poquillon, Dominique

doi:10.1023/b:oxid.0000016281.25965.93

Cited by 38 publications

(42 citation statements)

References 19 publications

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“…In the latter case, the total mass gain which includes that of the spall is obtained. The limitations of both these methods are comprehensively discussed in the literature [24].…”

Section: Specimen Preparationmentioning

confidence: 99%

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

Pillai

Dayal

2008

Oxid Met

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The growth and degradation of the oxide scale on modified 9Cr-1Mo ferritic steel was studied at 1123 K using a thermogravimetric balance by employing the ''transient-mass-gain method'' in conjunction with the adaptation of a cyclic-oxidation procedure. The total duration of the oxidation was 1000 h. The experiment revealed that the cracking of the scale was initiated when the average thickness was 72 lm. Spallation occurred when the average thickness was 75 lm. The rate of spallation was found to be enhanced as the scale thickens and attained a higher rate after 90 lm. The rate constants for the different stages of oxidation were found to be different. The specimen was examined by SEM, EDS and XRD. The scale morphology revealed outwardly protruded growth, a uniform adherent oxide layer and a spalled region. Four oxide phases were identified; Cr 2 O 3 , Fe 2 O 3 , (FeCr) 2 O 3 and FeCr 2 O 4 . The spall contained more (FeCr) 2 O 3 whereas the adherent scale was more FeCr 2 O 4 .

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“…In the latter case, the total mass gain which includes that of the spall is obtained. The limitations of both these methods are comprehensively discussed in the literature [24].…”

Section: Specimen Preparationmentioning

confidence: 99%

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

Pillai

Dayal

2008

Oxid Met

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“…3. Cyclic TGA [9] to measure NMC and GMG [10], with the advantage of spallation detection in real time.…”

mentioning

confidence: 99%

“…the metal to oxygen mass ratio in the oxide is constant. The calculation method now described is based on the technique described by Monceau and Poquillon [10]. NMC is defined as the net mass change at the end of cycle n. The mass gain due to oxidation (DM n ) during a high temperature dwell can be calculated easily as…”

mentioning

confidence: 99%

“…This determination of average oxide thickness is useful for comparing the calculated oxide thickness with the directly measured quantity. Metal consumption can also be calculated by assuming that the scale is composed of a certain oxide [10].…”

mentioning

confidence: 99%

“…If oxide formation during heating and cooling is negligible, then no buoyancy correction is necessary, because only the mass recorded at high temperature is used for the analysis [10]. Since most of the oxide consisted of alumina, the r ¼…”

mentioning

confidence: 99%

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

2007

Self Cite

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Cyclic thermogravimetric analysis (CTGA) provided a quantitative assessment of cyclic oxidation kinetics for a Ni-22Al-15Pt + 1 wt.% Hf alloy. This alloy showed a very low extent of oxide spallation and a slow oxidation rate. The adherent oxide thickness calculated from observed weight changes (due to both oxidation and scale loss) was found to be very similar to the directly measured scale thickness. It is concluded that a previously developed description of cyclic oxidation thermogravimetry is applicable, and that the alloy exhibits excellent performance.

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Oxidation behavior and thermal stability of a NiAl–V eutectic alloy

Milenković

Caram

2013

Physica Status Solidi (a)

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Oxidation behavior and thermal stability of a NiAl-V alloy with eutectic composition processed by directional solidification technique has been investigated. The surface analysis at the elevated temperature indicated that the investigated microstructures are stable at the isothermal conditions and an inert atmosphere. The oxidation testing in the synthetic air showed that the temperature of 400 8C is critical. In addition, the oxidation of the NiAl-V eutectic alloy is characterized by: (a) alteration of composition immediately below the surface substrate/oxide; (b) formation of the oxide layer rich in V, adherent to the substrate; and (c) formation of external oxide layer that presents oxide mixture formed by vanadium, nickel, and aluminum.Microstructure of the substrate/oxide interface of NiAl-V alloy oxidized at 900 8C for 24 h.

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Continuous Thermogravimetry Under Cyclic Conditions

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 38 publications

References 19 publications

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

Cyclic Oxidation of P91 by Thermogravimetry and Investigation of Integrity of Scale by “Transient-Mass-Gain” Method

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

Oxidation behavior and thermal stability of a NiAl–V eutectic alloy

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