Improvement of colloidal stability in colloidal processing for highly translucent, nanosized zirconia

Chuin Hao Chin, Andanastuti Muchtar, Che Husna Azhari, Masfueh Razali, Mohamed Aboras

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study aimed to improve the colloidal stability of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) suspension through colloidal processing to obtain highly translucent Y-TZP. Agglomeration is often the main complication in the processing of nanosized Y-TZP as it deteriorates mechanical and optical properties. Thus, colloidal processing is necessary to mitigate the agglomeration in Y-TZP. The colloidal stability of Y-TZP suspension plays a key role for the success of colloidal processing. In this study, colloidal processing was conducted at several stages, namely, dispersant addition, pH adjustment and sedimentation. Changes in particle size and zeta potential at various stages were recorded. The suspensions were then slip-casted to form green bodies. Green bodies were sintered and characterized for density and translucency. The results showed that dispersant addition followed by pH adjustment effectively dispersed soft agglomerates by introducing electrosteric stabilization, whereas sedimentation successfully segregated hard agglomerates and contributed excellent colloidal stability. With high colloidal stability, the translucency of Y-TZP was improved by approximately 30%. This study demonstrated different colloidal processing stages and proved that high colloidal stability and fine particle size are vital to produce highly translucent Y-TZP.

Original languageEnglish
Pages (from-to)1591-1597
Number of pages7
JournalSains Malaysiana
Volume47
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018

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particle size
processing stages
optical properties
mechanical properties
zeta potential

Keywords

  • Colloidal stability
  • Slip casting
  • Translucency
  • Zirconia

ASJC Scopus subject areas

  • General

Cite this

Improvement of colloidal stability in colloidal processing for highly translucent, nanosized zirconia. / Chin, Chuin Hao; Muchtar, Andanastuti; Azhari, Che Husna; Razali, Masfueh; Aboras, Mohamed.

In: Sains Malaysiana, Vol. 47, No. 7, 01.07.2018, p. 1591-1597.

Research output: Contribution to journalArticle

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AU - Razali, Masfueh

AU - Aboras, Mohamed

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