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The Oxidation of TiB2 Ceramics Containing Cr and Fe
Authors:Lee  D B  Lee  Y C  Kim  Deug J
Affiliation:(1) School of Metallurgical and Materials Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
Abstract:The oxidation behavior of TiB2, TiB2–0.5 wt.% Cr–0.5 wt.% Fe and TiB2–1 wt.% Cr–1 wt.% Fe was studied at 800, 900, and 1000°C in static air. These ceramics oxidized rather rapidly and formed thick oxide scales. The oxidation rates of TiB2-base ceramics were comparable to TiO2 formation on pure titanium. The scale formed on TiB2 consisted of TiO2 and B2O3. For TiB–Cr–Fe ceramics, a small amount of Cr- and Fe-oxides was additionally formed. B2O3 formed during oxidation tended to evaporate because of its high vapor pressure, making oxide scales porous and fragile. The oxidation of the TiB2-base ceramics appeared to be governed by the inward transport of oxygen via the highly porous oxide scale. The oxidation resistance of TiB2–Cr–Fe ceramics was similar to or better than that of TiB2.
Keywords:TiB2  chromium  iron  oxidation  TiO2  B2O3
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