Oxidation behavior of (Al2OC)1−x(AlN)x and AlN in TG–DTA

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Abstract The oxidation behavior of a commercial AlN and (Al 2 OC) 1− x (AlN) x ( x ≑0.80), which was obtained by the self-combustion reaction induced by the mechanical activation of the powder mixtures of aluminum metal with natural graphite, was compared in TG–DTA runs. A weight increase due to the oxidation of a commercial AlN began at temperatures above 600°C, followed by a very slow increase with increasing temperature up to 1000°C, whereas that of (Al 2 OC) 1−x (AlN) x began at temperatures above 700°C, followed by a rapid increase in temperature range from 850°C to 1000°C. The fractional conversion estimated by assuming the weight increase up to 1000°C in TG corresponding to the oxidation reaction of AlN or (Al 2 OC) 1− x (AlN) x to Al 2 O 3 was about 8% and 23%, respectively. The difference in oxidation reactivity of AlN and (Al 2 OC) 1− x (AlN) x is discussed.

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