A Decomposition Route for Synthesis of Al2O3 Crystal and its Applications as Thermal Conductivity Filler. Issue 3 (14th February 2014)

• Record Type: Journal Article
• Authors: Yanhui, Li; Lianglong, Li; Cheng, Peng; Mingmin, Bai; Wei, Zhao; Pinggen, Rao; Hill, R.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 3(2014)
• Page Start: 695
• Page End: 699
• Publication Date: 2014-02-14
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12848
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12848-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Platelike α‐Al₂O₃ powder was obtained at 850°C by thermal decomposition of ammonium aluminum carbonate hydroxide precursor, which was treated by hydrofluoric acid. The results showed the decomposition of the as‐prepared precursors experienced via three steps, adsorption of physical water, dehydration of crystalline water, and decomposition of the precursor, and the activation energies of the above three steps were calculated using the Coats–Redfern method. Meanwhile, the intermediate of (NH₄)₃AlF₆ obtained played an important role in decreasing activation energy of the decomposition and phase transformation. Moreover, the thermal conductivity of the epoxy resin filled with platelike alumina was improved obviously.</p> </abstract>