Continuous Thermogravimetry under Cyclic Conditions

Daniel Monceau (1) , Dominique Poquillon (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Thermogravimetry during cyclic oxidation of metallic alloys is described. A methodology is given in order to determine the Net Mass Gain, the GrossMass Gain, the total mass of spalled oxide, the rate of metal consumption and the average oxide scale thickness as a function of the number of cycles. The fraction of oxide scale which spalls at each cycle can be also calculated, and the parabolic constant can be estimated at each cycle. Two examples are given: the cyclic oxidation of a NiAl single crystal in flowing oxygen at 1150xC, and the cyclic oxidation of alloy P91 at 800xC in laboratory air. Advantages and disadvantages of this technique are discussed in regards to classical interrupted tests in crucibles. Thermogravimetry during cyclic oxidation appears to be a powerful tool in order to model and quantify the cyclic oxidation test which is of great interest in order to qualify the resistance of materials to oxidation in conditions close to their actual use, but a specific aspparatus need to be developed in order to obtain data in an efficient and economical manner. A new apparatus designed for this purpose is described briefly.

Mots clés: cyclic oxidation; thermogravimetry; high-temperature oxidation modeling; NiAl; P91

Domaines: Matériaux

Daniel Monceau, Dominique Poquillon. Continuous Thermogravimetry under Cyclic Conditions. Oxidation of Metals, 2004, 61 (1 - 2), pp.143-163. ⟨10.1023/B:OXID.0000016281.25965.93⟩. ⟨hal-03602353⟩