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Modeling Tape Cast Ceramics With Layers of Fugitive Phases

[+] Author Affiliations
Stephanie A. Wimmer, Ming-Jen Pan, Virginia G. DeGiorgi, Edward P. Gorzkowski

Naval Research Laboratory, Washington, DC

Paper No. DETC2012-70312, pp. 67-73; 7 pages
doi:10.1115/DETC2012-70312
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 32nd Computers and Information in Engineering Conference, Parts A and B
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4501-1

abstract

New fabrication methods for topologically complex monolithic ceramic components with accurate dimensions are being investigated. A common problem in the fabrication of precision ceramic components is controlling the forming process to attain uniform density in the green body; otherwise the tolerances achieved with green ceramics do not carry over to acceptable tolerances on the finished ceramic due to distortion and warping that occur during sintering. One of the fabrication methods under study is the fugitive phase approach in which a sacrificial material is used to form the desired channels and cavities. This paper is a continuation of previously presented work and examines the lamination step of the fugitive phase approach. In the lamination step, the green, pre-sintered, ceramic parts are layered with the sacrificial material parts and pressed together to remove air voids. During pressing uneven pressure distributions can be created in the green ceramic and the fugitive phase parts are slightly displaced or rotated. A computational model of the lamination process is used to examine how the material plasticity of the green ceramic, computational boundary conditions, and pressing duration affect the resulting geometry produced at the end of the lamination step prior to sintering. The resting stress, plastic strain, and deformed shapes are examined and compared. This information is used to complement experimental investigations of the fugitive phase approach.

Topics: Ceramics , Modeling

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