Effect of mechanical activation on mullite formation in an alumina-silica ceramics system at lower temperature

David O. Obada, David Dodoo-Arhin, Muhammad Dauda, Fatai O. Anafi, Abdulkarim S. Ahmed, Olusegun A. Ajayi, Ibraheem A. Samotu

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Purpose-This work aims to analyze the effect of mechanical activation on structural disordering (amorphization) in an alumina-silica ceramics system and formation of mullite most notably at a lower temperature using X-ray diffraction (XRD). Also, an objective of this work is to focus on a low-temperature fabrication route for the production of mullite powders. Design/methodology/approach-A batch composition of kaolin, alumina and silica was manually pre-milled and then mechanically activated in a ball mill for 30 and 60 min. The activated samples were sintered at 1,150°C for a soaking period of 2 h. Mullite formation was characterized by XRD and scanning electron microscopy (SEM). Findings-It was determined that the mechanical activation increased the quantity of the mullite phase. SEM results revealed that short milling times only helped in mixing of the precursor powders and caused partial agglomeration, while longer milling times, however, resulted in greater agglomeration. Originality/value-It is noted that, a manual pre-milling of approximately 20 min and a ball milling approach of 60 min milling time can be suggested as the optimum milling time for the temperature decrease succeeded for the production of mullite from the specific stoichiometric batch formed.

Original languageEnglish
Pages (from-to)288-293
Number of pages6
JournalWorld Journal of Engineering
Volume13
Issue number4
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Agglomeration
  • Amorphization
  • Mechanical activation
  • Mullite

Fingerprint

Dive into the research topics of 'Effect of mechanical activation on mullite formation in an alumina-silica ceramics system at lower temperature'. Together they form a unique fingerprint.

Cite this