Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Influence of SiC composition with different particle size on mechanical properties and microstructure of reaction-bonded SiC have been investigated using infiltration process of liquid Si. SiC specimens were prepared by reaction-bonding sintering at 1620°C in vacuum using different SiC–C composition...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2010/11/01, Vol.118(1383), pp.1028-1031
Main Authors: JANG, Byung-Koog, KIM, Se-Young, HAN, In-Sub, SEO, Doo-Won, HONG, Kee-Seog, WOO, Sang-Kuk, SAKKA, Yoshio
Format: Article
Language:English
Subjects:
Carbon black
Ceramics
Composition effects
Flexural strength
Fracture mechanics
Infiltration
Liquids
Mechanical properties
Microstructure
Reaction-bond
SiC
Silicon carbide
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Summary:Influence of SiC composition with different particle size on mechanical properties and microstructure of reaction-bonded SiC have been investigated using infiltration process of liquid Si. SiC specimens were prepared by reaction-bonding sintering at 1620°C in vacuum using different SiC–C composition. Reaction-bonded SiC specimens show dense with 3.0–3.05 gr/cm3 of density. SiC specimens with bi-modal SiC composition show a fine microstructure than those of uni-modal SiC composition. In addition, in the specimens with bi-modal SiC composition, the microstructure of the sample with use of fine SiC starting powders is finer rather than those of use of relatively coarse SiC starting powders. The flexural strength and fracture toughness of specimens with bi-modal SiC composition are higher than those of uni-modal SiC composition. The main fracture mode of specimens with a high strength is intergranular fracture.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.118.1028