DSC combined with chemiluminescence for studying polymer oxidation |
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| Authors: | Fearon P. K. Bigger S. W. Billingham N. C. |
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| Affiliation: | (1) Institute of Material Engineering, Technical University of Szczecin, 70-310 Szczecin al. Piastow 19, Poland;(2) Institute of Physics, Technical University of Szczecin 70-311 Szczecin al. Piastow 48/49, Poland;(3) Institute of Chemistry and Environmental Protection, Technical University of Szczecin, 71-065 Szczecin al. Piastow 42, Poland |
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| Abstract: | The oxidation of (Ti,W)C ceramics have been studied as a part of the program to investigate of properties of powder materials. Thermogravimetry, derivative thermogravimetry (TG-DTG), and differential thermal analysis DSC have been used in the non-isothermal study of powder oxidation (Ti,W)C in dry air atmosphere. The powder of crystalline carbide cermets with a ratio of W:Ti equals 0.3 was used in this study. The diagrams were recorded on a sample mass 3.42 mg on the Setaram apparatus in temperatures ranging from 25 to 1000°C. Seven different heating rates were used. The analytical techniques SEM, WDX, EDX and XRD were used in the research. The kinetics of the oxidation process was followed by the integral method by applying the Coats-Redfern's approximation. The kinetic models of particular stages of (Ti,W)C oxidation were evaluated from the dynamic mass losses data. The values of apparent activation energy E and the pre-exponential factor A of each stage of the oxidation were calculated. This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | cermets kinetics of oxidation oxidation of titanium-tungsten carbide |
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