Publication detail

Optimization of Fine Alumina Gelcasting Using In Situ Dynamic Rheology

BERA, O. TRUNEC, M.

Original Title

Optimization of Fine Alumina Gelcasting Using In Situ Dynamic Rheology

Type

journal article in Web of Science

Language

English

Original Abstract

In situ dynamic rheology was used to investigate the polymerization process of gelcasting suspensions based on fine alumina and water solution of methacrylamide and methylene bisacrylamide monomers. Small-strain oscillatory shear measurements were able to detect the progress of the whole gelation process from the liquid suspension to the elastic gel. The parameters describing the gelation kinetics and final gel properties such as idle time, total gelation time and equilibrium complex viscosity were correlated with the initiator/accelerator concentration, linear to cross-linking monomer ratio, polymerization temperature, and alumina loading. A strong catalytic effect of fine alumina particles on the decomposition of ammonium persulfate into free radicals was established. The catalytic activity of alumina powder was controlled by ions adsorbed on the particle surface. The catalytic effect of alumina in the presence of the Dolapix CE 64 dispersant made the polymerization process independent of the accelerator concentration and enabled the gelation of concentrated ceramic suspensions at and below room temperature without any accelerator. The variations of the polymerization process in the range of investigated gel compositions did not affect the particle packing in green bodies and the densities of sintered ceramic bodies were similar.

Keywords

Suspensions; Gels; Rheology; Polymerization; Catalyst

Authors

BERA, O.; TRUNEC, M.

RIV year

2012

Released

1. 9. 2012

Publisher

Wiley-Blackwell

Location

COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA

ISBN

0002-7820

Periodical

Journal of the American Ceramic Society

Year of study

95

Number

9

State

United States of America

Pages from

2849

Pages to

2856

Pages count

8

BibTex

@article{BUT94080,
  author="Oskar {Bera} and Martin {Trunec}",
  title="Optimization of Fine Alumina Gelcasting Using In Situ Dynamic Rheology",
  journal="Journal of the American Ceramic Society",
  year="2012",
  volume="95",
  number="9",
  pages="2849--2856",
  doi="10.1111/j.1551-2916.2012.05293.x",
  issn="0002-7820"
}