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TECHNICAL PAPERS

Densification Behavior of Ceramic Powder Under Cold Compaction

[+] Author and Article Information
K. T. Kim, S. W. Choi, H. Park

Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea

J. Eng. Mater. Technol 122(2), 238-244 (Sep 13, 1998) (7 pages) doi:10.1115/1.482793 History: Received March 12, 1998; Revised September 13, 1998
Copyright © 2000 by ASME
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References

Figures

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A schematic drawing of the triaxial compression apparatus.
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Variation of Young’s modulus with relative density for a zirconia powder compact obtained from triaxial compression test
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Variation of relative density with hydrostatic stress for zirconia powder at various confining pressures Pc
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(a) Description of the critical state in the stress and strain plane and (b) stress path in the (p,q) plane during triaxial compression
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Zirconia powder compacts (a) before deformation, (b) after isostatic compression under 200 MPa, and (c) after triaxial compression under confining pressure of 60 MPa.
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Variation of the effective stress q with axial and lateral strains for zirconia powder compacts at various confining pressures Pc
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Comparison between the proposed hyperbolic cap model (solid) and the modified Drucker–Prager/cap model (dashed) for iso-density curves of zirconia powder compacts under triaxial compression
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Comparison between the extrapolated curves from the proposed hyperbolic cap model (solid) and the modified Drucker–Prager/cap model (dashed) for experimental data of zirconia powder under cold isostatic pressing
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The modified yield surface in the vicinity of hydrostatic stress axis
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Comparison between finite element calculations from the proposed hyperbolic cap model (solid) and the modified Drucker–Prager/cap model (dashed) for the variation of relative density with hydrostatic pressure for zirconia powder during cold isostatic compression
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Comparison between experimental data and calculated results with various friction coefficients for the variation of ejection stress with axial stress of zirconia powder under die compaction
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Comparison between finite element calculations from the proposed hyperbolic cap model (solid) and the modified Drucker–Prager/cap model (dashed) for the variation of relative density with axial stress of zirconia powder under die compaction
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Variation of relative density with Vickers hardness (Hv) for zirconia powder compacts
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Comparison between (a) experimental data and finite element calculations from (b) the proposed hyperbolic cap model, and (c) the modified Drucker–Prager/cap model for relative density contour plots of a zirconia powder compact ejected from a die after compacted by single action pressing under axial stress of 100 MPa
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Finite element calculations from the proposed model for (a) normal stress and (b) shear stress distributions on a zirconia powder compact under axial stress of 100 MPa by single action pressing
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Finite element calculations from the proposed model for distributions of (a) residual Mises stress and (b) residual hydrostatic stress of a zirconia powder compact ejected from a die after compacted under 100 MPa

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