Int. J. of Nanomanufacturing   »   2014 Vol.10, No.1/2

 

 

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

 

Int. J. of Nanomanufacturing, 2014 Vol.10, No.1/2, pp.83 - 93

 

Submission date: 17 Dec 2012
Date of acceptance: 26 Mar 2013
Available online: 01 Feb 2014

 

 

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