Thermolysis of acidic aluminum chloride solution and its products


Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1016/j.ceramint.2012.10.226

Ключевые слова: Aluminum chloride, Thermolysis, Thermal analysis, Bonding material, Activated sintering, Amorphous precipitate, Bonding materials, Chlorine atom, Composite ceramic, Free water, Solid products, Temperature range, Water molecule, XRD, Activated alumina, Differential scanning calorimetry, Mass spectrometry, Molecules, Precipitation (chemical), Sintered alumina, Sintering, Thermoanalysis, Thermogravimetric analysis

Аннотация: A saturated acidic aluminum chloride solution with a total composition of AlCl3 center dot HCl-12H(2)O was obtained, and its behavior under thermal treatments was studied using thermogravimetry, differential scanning calorimetry and mass spectrometry techniques. The thermolysis solid products were characterized with XRD and SEM. FoПоказать полностьюur stages of the thermolysis could be distinguished. Initially, the solution lost free water molecules, and an amorphous precipitate with an approximate composition AlCl3 center dot HCl center dot 12 H2O was obtained as a product. The precipitate released eight water molecules in the temperature range 390-425 K. Then, all chlorine atoms in the form of HCl and two water molecules were outgassed at 425-485 K. The product completely lost water up to 650 K. The crystallization of the solid begins with appearance of the phase gamma-Al2O3 at 1073 K, and the final product, alpha-Al2O3, is observed at 1323 K. The application of the saturated trichloride solutions as a binder and a promoter for activated sintering of composite ceramics on the base of alumina was examined. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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Выпуск журнала: Vol. 39, Is. 4

Номера страниц: 3843-3848

ISSN журнала: 02728842

Место издания: OXFORD



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