Determining the oxidation behavior of metal powders during heating through thermogravimetric and evolved gas analysis using a coupled thermogravimetry-gas chromatography-mass spectrometry technique.
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| Title: | Determining the oxidation behavior of metal powders during heating through thermogravimetric and evolved gas analysis using a coupled thermogravimetry-gas chromatography-mass spectrometry technique. |
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| Authors: | Whitman, Catherine A.1 cathywhitman@dal.ca, O’Flynn, Julian T.1, Rayner, Addison J.1, Corbin, Stephen F.1 |
| Source: | Thermochimica Acta. Aug2016, Vol. 638, p124-137. 14p. |
| Subjects: | Metal powders, Oxidation, Thermogravimetry, Gas analysis, Gas chromatography/Mass spectrometry (GC-MS) |
| Abstract: | The oxidation behavior of a fine Ni superalloy (NiSA) powder, Inconel 625, within an alumina support powder during heating has been determined using combined thermogravimetry (TG) and evolved gas analysis (EGA). A gas chromatographic-mass spectrometer (GCMS) was used for EGA. The GCMS was able to semi-quantitatively measure the rate at which air was removed from the furnace due to a He purge, where no pre-evacuation was used. It also was able to measure the effectiveness of a three cycle evacuation and He purge in reducing the oxygen content in the furnace and identify an important alumina off-gassing process that exposed the NiSA powder to H 2 O and CO 2 . The parallel use of the TG signal was able to quantitatively determine the relationship between NiSA oxidation and relative concentrations of the oxidizing gases created by the differing furnace pre-conditions and the alumina powder off-gassing process. It was concluded that the developed TG-GCMS method can be widely applied to quantitatively study oxygen pick-up in metal powders under industrially relevant processing conditions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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