Tailoring particle alignment and grain orientation during tape casting and templated grain growth

Rebecca L. Walton, Mark D. Vaudin, Anna Katharina Hofer, Elizabeth Rader Kupp, Richard Joseph Meyer, Jr., Gary Lynn Messing

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The quality of crystallographic alignment in textured ceramics produced by tape casting and templated grain growth (TGG) has been little studied despite its demonstrated impact on magnetic, piezoelectric, and optical properties. Physical and crystallographic alignment of anisotropic template particles is shown to be directly linked to the casting rate, gap height, and casting viscosity during tape casting. These parameters are shown to affect the shape and magnitude of the shear rate profile under the doctor blade during casting which in turn causes a gradient in the torque acting on anisotropic particles. The magnitude of the torque, the time the slurry is exposed to torque during casting, and the ratio of casting height to template diameter are demonstrated to enable the particle alignment process to be tailored to produce well-aligned template particles. Crystallographic alignment of the textured ceramic was quantified by grain misalignment angle (full width at half maximum, FWHM) and degree of orientation (r) and is directly correlated with the degree of torque during casting. High-quality alignment (FWHM = 4.5°; r = 0.13) was demonstrated in the model TGG system consisting of submicrometer alumina and 5 vol% 11 μm diameter template platelet particles.

Original languageEnglish (US)
Pages (from-to)2405-2414
Number of pages10
JournalJournal of the American Ceramic Society
Volume102
Issue number5
DOIs
StatePublished - May 1 2019

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Grain growth
Tapes
Casting
Torque
Full width at half maximum
Aluminum Oxide
Platelets
Shear deformation
Alumina
Optical properties
Viscosity

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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title = "Tailoring particle alignment and grain orientation during tape casting and templated grain growth",
abstract = "The quality of crystallographic alignment in textured ceramics produced by tape casting and templated grain growth (TGG) has been little studied despite its demonstrated impact on magnetic, piezoelectric, and optical properties. Physical and crystallographic alignment of anisotropic template particles is shown to be directly linked to the casting rate, gap height, and casting viscosity during tape casting. These parameters are shown to affect the shape and magnitude of the shear rate profile under the doctor blade during casting which in turn causes a gradient in the torque acting on anisotropic particles. The magnitude of the torque, the time the slurry is exposed to torque during casting, and the ratio of casting height to template diameter are demonstrated to enable the particle alignment process to be tailored to produce well-aligned template particles. Crystallographic alignment of the textured ceramic was quantified by grain misalignment angle (full width at half maximum, FWHM) and degree of orientation (r) and is directly correlated with the degree of torque during casting. High-quality alignment (FWHM = 4.5°; r = 0.13) was demonstrated in the model TGG system consisting of submicrometer alumina and 5 vol{\%} 11 μm diameter template platelet particles.",
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Tailoring particle alignment and grain orientation during tape casting and templated grain growth. / Walton, Rebecca L.; Vaudin, Mark D.; Hofer, Anna Katharina; Kupp, Elizabeth Rader; Meyer, Jr., Richard Joseph; Messing, Gary Lynn.

In: Journal of the American Ceramic Society, Vol. 102, No. 5, 01.05.2019, p. 2405-2414.

Research output: Contribution to journalArticle

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