Title: Evolution of properties and microstructure of Al and Si incorporated Al₂O₃-C material with nano-SiO₂ powder addition

Authors: Xinhong Liu; Weifen Jiang; Quanli Jia; Xiaoyan Zhu

Addresses: High Temperature Ceramics Institute, Zhengzhou University, Zhengzhou, Henan Province 450052, China ' North China University of Water Resources and Electric Powder, Zhengzhou, Henan Province 450011, China ' High Temperature Ceramics Institute, Zhengzhou University, Zhengzhou, Henan Province 450052, China ' High Temperature Ceramics Institute, Zhengzhou University, Zhengzhou, Henan Province 450052, China

Abstract: The Al and Si incorporated Al₂O₃-C material has been prepared using alumina, Al and Si powder, graphite and nano-SiO₂ powder as starting materials and resin as binder. Effects of nano-SiO₂ powder addition on physical properties, high temperature strength properties and oxidation resistance of this material have been studied. The results show: 1) physical properties are improved with addition of appropriate nano-SiO₂ powder; 2) high temperature strength properties are increased with addition of nano-SiO₂ powder. This may be attributed to nano-SiO₂ powder promote Al, Si to react with C, CO and N₂ in-situ formation fibrous AlN and SiC non-oxides, and the non-oxide fibres constitute network structure creating strengthening and toughening effects; 3) oxidation resistance is improved with addition of nano-SiO₂ powder. This may be due to SiO₂ protective layer containing mullite forming easily with nano-SiO₂ powder addition which would retard O₂ diffusion into specimen.

Keywords: Al2O3-C material; aluminium oxide; alumina; nano-SiO2 powder; physical properties; high temperature; strength properties; microstructure; nanotechnology; silicon dioxide; silica; strengthening; toughening; oxidation resistance; graphite.

DOI: 10.1504/IJNM.2014.059000

International Journal of Nanomanufacturing, 2014 Vol.10 No.1/2, pp.83 - 93

Received: 29 Dec 2012
Accepted: 26 Mar 2013
Published online: 17 May 2014 *

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