Dispersion behaviour of laser-synthesized silicon carbide nanopowders in ethanol for electrophoretic infiltration

被引：24

作者：

Coupe, A. ^{[1
]}

Maskrot, H. ^{[1
]}

Buet, E. ^{[1
,2
]}

Renault, A. ^{[3
]}

Fontaine, P. J. ^{[1
]}

Chaffron, L. ^{[1
]}

机构：

[1] CEA, DEN, SRMA, LTMEx, F-91191 Gif Sur Yvette, France

[2] Inst Sci Mat Mulhouse, CNRS, LRC 7228, F-68057 Mulhouse, France

[3] CEA, DEN, SRMA, LA2M, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 14期

关键词：

Powder gas-phase reaction; Suspensions; Composite; Surface; Chemical properties; SINTERABLE CERAMIC POWDERS; SIC/SIC COMPOSITES; DRIVEN REACTIONS; SIC POWDER; CARBON; MICROSTRUCTURE; DEPOSITION; STABILITY; SPECTROSCOPY; FIBERS;

D O I：

10.1016/j.jeurceramsoc.2012.05.022

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

SiC nanopowders of 30 nm in diameter were successfully synthesized by laser-pyrolysis with high production rate (1.7 kg/h) and high quantity (>2 kg). The as-synthesized nanopowders were heat-treated in order to slightly oxidize the surface. It was shown that the heat-treatment does not modify structural properties or morphology but modifies the surface chemistry. Ethanolic suspensions with polyethylenimine (PEI) as dispersant were prepared from the heat-treated powders. The suspensions properties were characterized in terms of rheology, zeta potential and size distribution before and after operational pH adjustment with hydrochloric acid (HC11 M) or acetic acid (CH3COOH). High concentrated suspensions (28 wt%) with low viscosity were obtained after pH adjustment with CH3COOH. Electrophoretic infiltrations of carbon preforms carried out with these suspensions lead to a high quality infiltration of the inter-tows area as well as of the intra-tows area, some tows being completely filled with the nanopowders. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：3837 / 3850

页数：14

共 52 条

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