Aluminum Nitride Oxidation by Simultaneous TG and DTA |
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Authors: | Dweck J Aderne R S Shanefield D J |
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Institution: | (1) School of Chemistry, Federal University of Rio de Janeiro, Bloco E do CT, Sala E-206, Cidade Universitária, Rio de Janeiro, RJ, Brasil, 21949-900;(2) School of Chemistry, UFRJ and Catalysis Nucleus NUCAT/PEQ/COPPE/UFRJ, Centro de Tecnologia, Bloco G-115, Cidade Universitária, Rio de Janeiro, Brasil, 219494-900;(3) Department of Ceramic and Materials Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ 08854-8065, USA |
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Abstract: | This work is a study, by simultaneous thermogravimetry (TG) and differential thermal analysis (DTA), of the oxidation of a
water resistant aluminum nitride powder which has a special protective coating, and an uncoated AlN powder which has become
partially hydrated during its use. The activation energy for oxidation is estimated by the Kissinger and isoconversional methods.
In the former method, the temperatures of the oxidation peaks were obtained from DTA and DTG curves. The activation energies
for oxidation of the water resistant AlN, obtained by the Kissinger method, are 357±10 kJ mol–1, 392±12 kJ mol–1 using respectively DTG and DTA data. For the uncoated AlN, the values are 243±7 and 257±8 kJ mol–1, respectively. By the isoconversional method, the average values obtained for coated and uncoated samples are, respectively,
323±10 and 224±7 kJ mol–1. Therefore, the special coating, which protects the aluminum nitride from humidity action, also provides a higher resistance
to oxidation.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | aluminum nitride DTA DTG isoconversional method Kissinger oxidation TG |
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