Amino-functionalization of colloidal alumina particles for enhancement of the infiltration behavior in a silica-based ceramic core

Gye Seok An, Soo Wan Choi, Tae Gyun Kim, Jae Rok Shin, Yong In Kim, Sung Churl Choi, Young Gil Jung

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The surface characteristics of nano-sized alumina particles were modified to include amine functional groups to enhance the infiltration behavior in a silica-based ceramic core, inhibiting crystallization of the cristobalite phase in order to improve mechanical properties. In this study, polymer-based polyethylenimine (PEI) or silane-based (3-Aminopropyl)triethoxysilane (APTES) were used as precursors in amine group addition. The specimens were characterized by the C-H stretching vibration and N-H bending vibration or the symmetric stretching vibration of siloxane group (Si-O-Si) in the FT-IR spectra, depending on the nature of the molecular structure of the precursor molecule. The dispersion properties were also improved through electrostatic repulsion or steric hindrance. These modifications resulted in a PEI-grafted colloidal alumina particle that induced a more rapid infiltration process with greater efficiency than did the APTES-treated particle. The rapid infiltration of the ceramic core suppressed the formation of the cristobalite phase, improved the flexural strength from 3.2 to 10.2 MPa, and reduced the linear shrinkage rate from 1.91–1.05%.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalCeramics International
Volume43
Issue number1
DOIs
StatePublished - 2017 Jan 1

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Aluminum Oxide
Infiltration
Silicon Dioxide
Polyethyleneimine
Alumina
Silica
Stretching
Amines
Siloxanes
Silanes
Bending (forming)
Crystallization
Bending strength
Functional groups
Molecular structure
Electrostatics
Polymers
Mechanical properties
Molecules
amino-propyl-triethoxysilane

Keywords

  • Amine-functionalization
  • Ceramic core
  • Colloidal alumina
  • Infiltration
  • Precursor

Cite this

An, Gye Seok ; Choi, Soo Wan ; Kim, Tae Gyun ; Shin, Jae Rok ; Kim, Yong In ; Choi, Sung Churl ; Jung, Young Gil. / Amino-functionalization of colloidal alumina particles for enhancement of the infiltration behavior in a silica-based ceramic core. In: Ceramics International. 2017 ; Vol. 43, No. 1. pp. 157-161.
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Amino-functionalization of colloidal alumina particles for enhancement of the infiltration behavior in a silica-based ceramic core. / An, Gye Seok; Choi, Soo Wan; Kim, Tae Gyun; Shin, Jae Rok; Kim, Yong In; Choi, Sung Churl; Jung, Young Gil.

In: Ceramics International, Vol. 43, No. 1, 01.01.2017, p. 157-161.

Research output: Contribution to journalArticle

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AU - Choi, Sung Churl

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