Preparation and properties of mullite - Based iron multi - Functional nanocomposites

Hao Wang, Weimin Wang, Zhengyi Fu, Tohru Sekino, Koichi Niihara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Mullite-based nanocomposite powders with embedded iron nanoparticles were synthesized by reduction of sol-gel prepared Al5.4Fe 0.6Si2O13 solid solution in hydrogen. Structural characterization studied by TEM revealed that the intra-granular iron nanoparticles along with inter-type iron grains were obtained in mullite matrix. The magnetic properties of nanocomposite powders after reduction at 1200°C were measured by SQUID. It suggests that the intergranular and intragranular α-iron nanoparticles had the ferromagnetic and superparamagnetic behavior at room temperature, respectively. Dense Mullite-based iron composites were prepared from the nanocomposite powders reduced at different temperatures by hot pressing. The mechanical and magnetic properties were strongly affected by the reduction temperature. Flexural strength of mullite based iron nanocomposite reduced at 1200°C and successively hot pressed at 1650°C is one times higher than monothetic mullite. Furthermore, dense composites also behave ferromagnetic property at room temperature.

Original languageEnglish
Title of host publicationCharacterization, Design, and Processing of Nanosize Powders and Nanostructured Materials - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology
Pages203-211
Number of pages9
Publication statusPublished - 2006 Dec 1
Event6th Pacific Rim Conference on Ceramic and Glass Technology - Maui, Hawaii, United States
Duration: 2005 Sep 112005 Sep 16

Publication series

NameCeramic Transactions
Volume190
ISSN (Print)1042-1122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology
CountryUnited States
CityMaui, Hawaii
Period05/9/1105/9/16

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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  • Cite this

    Wang, H., Wang, W., Fu, Z., Sekino, T., & Niihara, K. (2006). Preparation and properties of mullite - Based iron multi - Functional nanocomposites. In Characterization, Design, and Processing of Nanosize Powders and Nanostructured Materials - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (pp. 203-211). (Ceramic Transactions; Vol. 190).