Effects of milling and subsequent heat treatment on preparation of mullite–zirconia nanocomposites

Author

Ghaffari, Shirin ; Alizadeh, Mahnoosh ; Asadian, Keivan ; Ebadzadeh, Touradj ; Ghanbari, Ahmad

Author_Institution

Ceramic Div., Mater. & Energy Res. Center, Alborz, Iran

Volume

8

Issue

4

fYear

2013

fDate

Apr-13

Firstpage

193

Lastpage

196

Abstract

Mullite-zirconia composites were fabricated through reaction sintering of mechanically activated alumina and zircon powder mixtures. X-ray diffraction results showed that increasing milling time resulted in gradual weakening and broadening of alumina and zircon peaks. For the sample milled for 70 h in which there are no peaks present from zircon, heating at 1200°C resulted in the reappearance of the zircon peaks. Samples sintered at 1500°C achieved complete formation of mullite and zirconia. These samples exhibited the following physical and mechanical properties: density 3.87 g/cm³, open porosity 3.45%, hardness 11.44 ± 0.3 GPa and fracture toughness 4.7 Mpam^1/2.

Keywords

X-ray diffraction; aluminium compounds; fracture toughness; hardness; heat treatment; milling; nanocomposites; nanofabrication; nanoparticles; porosity; sintering; zirconium compounds; Al₆Si₂O₁₃-ZrO₂; X-ray diffraction; fracture toughness; hardness; heat treatment; mechanical properties; mechanically activated alumina; milling; mullite-zirconia nanocomposites; physical properties; porosity; reaction sintering; temperature 1200 degC; temperature 1500 degC; time 70 h; zircon powder mixtures;

fLanguage

English

Journal_Title

Micro & Nano Letters, IET

Publisher

iet

ISSN

1750-0443

Type

jour

DOI

10.1049/mnl.2013.0008

Filename

6545082