Thermal formation of corundum from aluminium hydroxides prepared from various aluminium salts

Bulletin of materials science

F Porte²  J Temuujin³  K J D Mackenzie⁴  P Angerer⁵  Ts JADAMBAA¹  F Riley² 

[1] Department of Chemical Technology, Mongolian Technical University, Ulaanbaatar 46, Mongolia$$Department of Chemical Technology, Mongolian Technical University, Ulaanbaatar 46, MongoliaDepartment of Chemical Technology, Mongolian Technical University, Ulaanbaatar 46, Mongolia$$;Department of Materials, University of Leeds, Leeds LS2 9JT, UK$$Department of Materials, University of Leeds, Leeds LS2 9JT, UKDepartment of Materials, University of Leeds, Leeds LS2 9JT, UK$$;Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar 51, Mongolia$$Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar 51, MongoliaInstitute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar 51, Mongolia$$;Department of Materials, University of Oxford, Oxford OX1 3PH, UK$$Department of Materials, University of Oxford, Oxford OX1 3PH, UKDepartment of Materials, University of Oxford, Oxford OX1 3PH, UK$$;Institute of Materials, German Aerospace Centre, Köln, Germany$$Institute of Materials, German Aerospace Centre, Köln, GermanyInstitute of Materials, German Aerospace Centre, Köln, Germany$$

关键词: Aluminium hydroxide;    corundum;    thermal transformation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Aluminium hydroxides have been precipitated from various aluminium salts and the differences in their thermal behaviour have been investigated. Pseudoboehmite derived from the nitrate, sulfate and chloride all form ð›�?-Al₂O₃ at ∼ 400°C but the formation of ð›�?-Al₂O₃ at 1200°C occurs more readily in the material derived from the sulfate. This contains a higher concentration of anionic impurities related to differences in the solubility of the original aluminium salts. The sulfate is retained in the gel to higher temperatures at which its eventual decomposition may lead to the formation of a reactive pore structure which facilitates the nucleation of ð›�?-Al₂O₃.

【 授权许可】

Unknown