Slip cast nitride-bonded silicon carbide bodies

Ramachandra Rao, R and Kannan, TS (2002) Slip cast nitride-bonded silicon carbide bodies. Materials Chemistry and Physics, 75 (1amp;3). pp. 270-275.

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Abstract

The dispersion behaviour of SiC, Si and their mixtures, in deionised water, was studied as a function of pH by sedimentation, viscosity, rheology and zeta potential measurements. Slips of SiC + Si mixtures (3:1, 1:1 and 1:3 weight ratios) with 1 wt.% of Fe2O3 (with respect to Si), conditioned in the pH range 8-9.5 were slip cast to 56-65% dense green bodies. These on nitridation under 0.18 MPa pressure of high-purity nitrogen at 1400-1450 xB0;C for 2-4 h resulted in nitride-bonded SiC bodies having 30-76 vol.% of Si3N4 bond, densities of 2.1-2.4 g cm-3 and 3-point flexural strengths of 60-220 MPa. The phase analyses of the products were carried out by XRD and microstructure by SEM studies. xA9; 2002 Published by Elsevier Science B.V.

Item Type:	Article
Uncontrolled Keywords:	Nitridation; Nitride-bonded silicon carbide; SiC-Si3N4; Slip casting; Bending strength; Casting; Dispersions; Microstructure; Nitrides; pH effects; Rheology; Scanning electron microscopy; Sedimentation; Viscosity; X ray diffraction analysis; Slip castings; Silicon carbide;
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	MS Jayashree S
Date Deposited:	20 Jan 2005
Last Modified:	24 May 2010 04:08
URI:	http://nal-ir.nal.res.in/id/eprint/96

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