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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.113  No.1314 (February) (2005)  >  pp.135-142

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
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Influence of Heat Treatment on Phases, Microstructures and Mechanical Properties of Laminated Fabric (SiC and Aluminosilicate)/ Mullite Matrix Composites (Part 2)

Rulin DONG1) and Yoshihiro HIRATA1)
1) Department of Advanced Nanostructured Materials Science and Technology, Graduate School of Science and Engineering, Kagoshima University

  Influence of heat treatment at 1000-1500°C for 24 h on phases, microstructures and mechanical properties was studied for laminated SiC satin or aluminosilicate plain fabric/mullite matrix composites. Composites were produced by a polymer impregnation and pyrolysis method (PIP) using a mullite precursor. A mullite precursor solution of the mixtures of Si(OC2H5)4 and Al(NO3)3 was impregnated into the green layered fabric/mullite powder (filler) composite and was pyrolyzed at 500°C in air. This polymer impregnation and pyrolysis process was repeated 10 times. The SiC fabric (25-27 vol%)/mullite matrix composite with a relative density 72-75% showed weight loss after heat treatment in an Ar atmosphere (oxygen partial pressure ~0.75 Pa) at 1300-1500°C. This weight loss was due to the formation of volatile SiO gas resulting from the pyrolysis of mullite matrix (3Al2O3•2SiO2(s)→3Al2O3(s)+2SiO(g)+O2(g)) and active oxidation of the SiC fiber (SiC(s)+O2(g)→SiO(g)+CO(g)). The heat-treated SiC fabric/mullite matrix composites showed an elastic deformation in the initial stage of the stress-displacement curve, followed by pseudoductility. The strength (186 MPa) after the 1000°C heat treatment decreased to 17 MPa after the 1500°C heat treatment. The energy of fracture was 1-4 kJ/m2 in the heat treatment temperature range from 1000 to 1500°C.On the other hand, the aluminosilicate fabric (25-30 vol%)/mullite matrix composite with a relative density 71-73% showed no weight loss after heat treatment at 1000-1500°C in air. The porosity of the composite decreased with increasing heat treatment temperature because of the densification of the mullite matrix. This composite also showed pseudoductility after the heat treatment. The strength for the composite was slightly enhanced by increasing the heat treatment temperature.



Keyword:
Laminated mullite matrix composite, SiC fiber, Aluminosilicate fiber, Thermal stability, Mechanical properties

Received: August 04, 2004
Accepted: October 26, 2004 , Published online: February 01, 2005
Copyright (c) 2005 The Ceramic Society of Japan

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