Role of boron on the Spark Plasma Sintering of an α-SiC powder

This study deals with the role of non-oxide sintering aids such as boron carbide (B 4C) or – free boron (B) plus free carbon (C) – on the Spark Plasma Sintering treatment of silicon carbide. The results so obtained clearly show that free boron plus free carbon additions lead to the higher densificat...

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Published in:Journal of the European Ceramic Society 2008, Vol.28 (9), p.1881-1890
Main Authors: Maître, A., Put, A. Vande, Laval, J.P., Valette, S., Trolliard, G.
Format: Article
Language:English
Subjects:
Applied sciences
Boron
Building materials. Ceramics. Glasses
Carbon
Ceramic industries
Chemical industry and chemicals
Engineering Sciences
Exact sciences and technology
Grain growth
Materials
SiC
Sintering
SPS
Structural ceramics
Technical ceramics
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cited_by cdi_FETCH-LOGICAL-c471t-cc79683398c9ea0d3ba2ac05a90b916973f232f6f9abf92a82c5b6444d7eddc43
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container_end_page 1890
container_issue 9
container_start_page 1881
container_title Journal of the European Ceramic Society
container_volume 28
creator Maître, A.
Put, A. Vande
Laval, J.P.
Valette, S.
Trolliard, G.
description This study deals with the role of non-oxide sintering aids such as boron carbide (B 4C) or – free boron (B) plus free carbon (C) – on the Spark Plasma Sintering treatment of silicon carbide. The results so obtained clearly show that free boron plus free carbon additions lead to the higher densification rates. This favourable behaviour with regards to the densification kinetics is accompanied by the absence of any abnormal grain growth. At the opposite, boron carbide additions do not significantly raise the densification kinetic after SPS treatment of SiC in comparison to pure silicon carbide. In this case, TEM investigations point out the formation of a borosilicate vitreous phase due to the dissolution process of B 4C in contact with a native superficial silica layer surrounding the SiC grains. The resulting liquid phase leads to an abnormal grain growth coupled with undensifying process.
doi_str_mv 10.1016/j.jeurceramsoc.2008.01.002
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subjects Applied sciences
Boron
Building materials. Ceramics. Glasses
Carbon
Ceramic industries
Chemical industry and chemicals
Engineering Sciences
Exact sciences and technology
Grain growth
Materials
SiC
Sintering
SPS
Structural ceramics
Technical ceramics
title Role of boron on the Spark Plasma Sintering of an α-SiC powder
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