Preparation and characterization of an Al2O3-ZrO2 nanocomposite, Part I:: Powder synthesis and transformation behavior during fracture

被引：86
作者：
Sarkar, D. [1 ]
Adak, S.
Mitra, N. K.
机构：
[1] Natl Inst Technol, Dept Ceram Engn, Rourkela 769008, Orissa, India
[2] Univ Calcutta, Dept Chem Technol, Kolkata 9, W Bengal, India
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2007年 / 38卷 / 01期
关键词：
sol-gel processing; nano-structures; mechanical properties; fractography;
D O I：
10.1016/j.compositesa.2006.01.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An alumina-zirconia composite containing 5 mol% zirconia was prepared by following a wet interaction process in aqueous medium via the sol-gel route. The formed hydrogel which was aged for proper growth and orientation at room temperature, was then dried at a low temperature to minimize agglomeration. The sol-gel derived precursor powder was properly characterized through determination of surface area, particle size and thermal analysis. The sintering behavior was studied by compacting the nano-powder through cold isostatic pressing where maximum densification of 98.4% was achieved at 1550 degrees C. During Vickers indentation using a 5 kg load, cracks were propagating around the grain boundaries and fractured the ZrO2 particles, which was associated with t-ZrO2 to m-ZrO2 transformation. Sintering was studied in the absence of a mineraliser. (c) 2006 Elsevier Ltd. All rights reserved.
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页码：124 / 131
页数：8
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