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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.3 (March) (2017)  >  pp.95-99

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.3 (March) (2017)   pp.95 - 99 Next article>>

Effective infiltration with polyethyleneimine-grafted colloidal alumina particles for silica-based ceramic cores

Gye Seok AN1), Soo Wan CHOI1), Young-Hwan KIM1) 2), Bong-Geun PARK1), Jeong-Gu YEO2), Sung-Churl CHOI1)
1) Division of Materials Science and Engineering, Hanyang University 2) Advanced Materials and Devices Laboratory, Korea Institute of Energy Research

Amine-functionalized alumina colloidal particles were prepared using polyethyleneimine (PEI) for enhancing the infiltration process of silica based ceramic core. The surface properties of PEI-grafted alumina particles were adjusted to improve their dispersion behavior in aqueous suspension, and the surface charge was adjusted to enhance their adsorption behavior, in neutral pH atmosphere, via an electrostatic repulsion force with a fused silica matrix containing an implied strong negative charge. The characteristics of the surface-modified particles were optimized as shown by the C–H stretching vibration and N–H bending vibration from FT-IR spectra, and the surface charge alternated from −3 to 45 mV. As a result, the dispersion behavior in aqueous solvent was advanced as indicated by the decrease of the polydispersity index, decrease of the average size from 178 to 58 nm, and sharpness of the particle size distribution parabola. These improvements greatly contributed to the acceleration of the infiltration time and efficiency (up to 30 min). Consequently, the promptly infiltrated specimens improved the flexural strength from 3.2 to 10.2 MPa and reduced the linear shrinkage rate from 1.91 to 1.05% as well.


Keyword:
Amine-functionalization, Colloidal alumina, Fused silica, Ceramic core, Infiltration

Received: September 08, 2016
Accepted: January 04, 2017 , Published online: March 01, 2017

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