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Title: Synthesis and Thermo-Mechanical Properties of Sol-Gel Derived Zirconia Toughened Alumina Nanocomposite
Authors: Sarkar, D
Adak, S
Issue Date: 2007
Publisher: National Institute of Technology, Rourkela
Citation: Synthesis and Thermo-Mechanical Properties of Sol-Gel Derived Zirconia Toughened Alumina Nanocomposite, Doctoral Thesis, submitted to NIT Rourkela
Abstract: Al2O3-ZrO2 composite precursor powder containing 5-15mol% ZrO2 is prepared by wet chemical route. The washed gel containing pseudoboehmite and amorphous zirconia are characterized with respect to DTA/TG, XRD and IR spectroscopy. In the calcined powder phase evolution of Al2O3 follows the sequence: pseudoboehmite → bayerite → boehmite → -Al2O3 → -Al2O3 → -Al2O3; while that of ZrO2 follows amorphous ZrO2 → t-ZrO2 → (t + m)-ZrO2. However, the crystallization behavior of aluminum-hydroxide is somewhat affected with addition of zirconia. FTIR study reveal the number of M-OH and M-O bond increases on increasing mol% of ZrO2 due to a change in the cationic charge of the composite powder. The formation of amorphous material before crystallization can also be predicted from TEM study, where particle exhibits different morphology; and show smooth, distinct and faceted surfaces at different temperature. A bimodal particle size distribution is observed because of both unagglomerated and partial...
Description: Copyright for the thesis belongs to NIT Rourkela
URI: http://hdl.handle.net/2080/662
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