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- Title
Oxidation Studies of SiAlON/MgAlON Ceramics with FeO and CaO Impurities, Part I: Kinetics.
- Authors
Li, Peng; Zhang, Mei; Teng, Lidong; Seetharaman, Seshadri
- Abstract
T he oxidation behaviors of composites SiAlON/MgAlON phases (β-SiAlON, 15R-SiAlON and MgAlON) synthesized from the residue during the leaching treatment of salt cake and corresponding synthetic samples were investigated in air by thermogravimetric measurements. Combined kinetics, viz. linear law + arctan law + parabolic law, are used to describe the kinetics of oxidation in isothermal mode. The oxidation studies reveal the effects of impurities, namely, FeO and CaO, present in the salt cake residue. The addition of FeO results in a lower activation energy and more aggressive oxidation. The addition of CaO caused the shrinkage during the synthesis and liquid formation during the oxidation above 1673 K (1400 °C). The impurities of CaO and FeO in the leaching residue can result in an aggressive oxidation at low temperature and a protective oxidation at temperatures above the eutectic point.
- Subjects
CERAMIC metals; ALUMINUM oxynitride spinel; IRON oxides; LIME (Minerals); METAL inclusions; CHEMICAL kinetics; OXIDATION; METALLIC composites; LEACHING
- Publication
Metallurgical & Materials Transactions. Part B, 2013, Vol 44, Issue 1, p210
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-012-9763-y