Controlling microstructural anisotropy during forming

Shawn M. Nycz, Richard Haber

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

Microstructural anisotropy is a key feature in the control of specific properties of low thermal expansion ceramics. A study has been conducted that quantifies the particle orientation for anisometric particles when subjected to a shear in a fluid/paste. The preferential orientation which remains in a green body after processing can affect the tendency to crack during drying and firing, differential shrinkage and warpage, as well as a multitude of physical properties such as strength and density. An optical method was developed which reveals details about the preferred orientation that exists in thin samples. This technique was applied to aluminum oxide green bodies to determine orientation which was affected by experimentally varying rheology, solids loading, and shear rate. Computational fluid dynamics software was used to model the shear fields present in the experimental fluid during forming. Results show that microstructural anisotropy can be varied throughout a formed part by controlling cross-sectional dimensions and forming parameters.

Original languageEnglish (US)
Pages (from-to)45-52
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume26
Issue number8
StatePublished - Dec 1 2005
Event29th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: Jan 23 2005Jan 28 2005

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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