Chakrabarti, Omprakash and Das, Prabal Kumar (2001) High temperature load-deflection behaviour of reaction bonded SiC(RBSC). Ceramics International, 27 (5). pp. 559-563. ISSN 0272-8842

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Abstract

Preforms of commercial SiC (0.2 and 23.65 μm particle diameter) and petroleum coke powders were infiltrated with Si to prepare reactionbonded SiC (RBSC) with varying amount of residual Si phase (16.5–42.0% v/v). Load– deflectionbehaviour of the infiltrated materials was studied with the help of a 4-pt. bending strength tester at room temperature, 1300 and 1370°C. The hightemperature deformation of the material showed marked difference from the room temperaturebehaviour. At 1300°C at a constant level of load (150 N), deflection increased from 0.16 mm to >0.58 mm with increase in residual Si from 16.5 to 42.0% v/v in the case of fine grained RBSC; for coarse grained material, the corresponding increase was observed to be from 0.11 to 0.24 mm with an increase in Si from 16.5 to 24.1% v/v. The room temperatureload–deflectionbehaviour was found to be mostly elastic in nature. Reflected light optical microscopy (RLM) of deformed specimens and scanning electron microscopy (SEM) of fractured surfaces revealed the evidence of plastic flow that appears to be set in by high ductility of the residual Si causing deformation at hightemperatures.

Item Type:	Article
Uncontrolled Keywords:	Powders; Microstructure; SiC; Deflection; Load;Reaction bonding
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	29 Mar 2012 08:20
Last Modified:	29 Mar 2012 08:20
URI:	http://cgcri.csircentral.net/id/eprint/1390

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