Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone

H C Park, T Y Yang, Y B Lee, B K Kim, R Stevens

Research output: Contribution to journalArticle

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Abstract

Particle size and its distribution, sedimentation bulk density and rheology of mullite, zirconia, and mullite/zirconia mixed suspensions have been studied in terms of oxide loading (20, 30 vol%), and types of additives (dispersant, dispersant/plasticizer, dispersant/plasticizer/binder). Polyester/polyamine, dibutyl phthalate, poly(vinyl butyral), and methyl isobutyl ketone have been used as the dispersant, plasticizer, binder, and liquid medium, respectively. Sedimentation density significantly increased upon adding dispersant; the effect was more pronounced with zirconia suspension most likely due to the fine and hence high specific surface area of zirconia. With further addition of plasticizer and plasticizer/binder, the sedimentation density decreased. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high order structure formation in the suspended particles. High shear rate rheology showed a shear thinning and its onset began at lower shear rate with higher solid loading. Mullite/zirconia mixed suspension gave intermediate sedimentation and rheological behavior, implying the two types of particles are non-interacting. (C) 2002 Kluwer Academic Publishers.
Original languageEnglish
Pages (from-to)4405-4410
Number of pages6
JournalJournal of Materials Science
Volume37
Issue number20
Publication statusPublished - 2002

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Mullite
Plasticizers
Ketones
Sedimentation
Zirconia
Powders
Suspensions
Binders
Rheology
Shear deformation
Dibutyl Phthalate
Polyesters
Shear viscosity
Shear thinning
Polyamines
Specific surface area
Oxides
zirconium oxide
methyl isobutyl ketone
aluminosilicate

Cite this

Park, H. C., Yang, T. Y., Lee, Y. B., Kim, B. K., & Stevens, R. (2002). Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone. Journal of Materials Science, 37(20), 4405-4410.

Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone. / Park, H C; Yang, T Y; Lee, Y B; Kim, B K; Stevens, R.

In: Journal of Materials Science, Vol. 37, No. 20, 2002, p. 4405-4410.

Research output: Contribution to journalArticle

Park, HC, Yang, TY, Lee, YB, Kim, BK & Stevens, R 2002, 'Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone', Journal of Materials Science, vol. 37, no. 20, pp. 4405-4410.
Park, H C ; Yang, T Y ; Lee, Y B ; Kim, B K ; Stevens, R. / Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone. In: Journal of Materials Science. 2002 ; Vol. 37, No. 20. pp. 4405-4410.
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AB - Particle size and its distribution, sedimentation bulk density and rheology of mullite, zirconia, and mullite/zirconia mixed suspensions have been studied in terms of oxide loading (20, 30 vol%), and types of additives (dispersant, dispersant/plasticizer, dispersant/plasticizer/binder). Polyester/polyamine, dibutyl phthalate, poly(vinyl butyral), and methyl isobutyl ketone have been used as the dispersant, plasticizer, binder, and liquid medium, respectively. Sedimentation density significantly increased upon adding dispersant; the effect was more pronounced with zirconia suspension most likely due to the fine and hence high specific surface area of zirconia. With further addition of plasticizer and plasticizer/binder, the sedimentation density decreased. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high order structure formation in the suspended particles. High shear rate rheology showed a shear thinning and its onset began at lower shear rate with higher solid loading. Mullite/zirconia mixed suspension gave intermediate sedimentation and rheological behavior, implying the two types of particles are non-interacting. (C) 2002 Kluwer Academic Publishers.

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