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Rheology of Porous Alumina and Simulation of Hot Isostatic Pressing
Author(s) -
Besson Jacques,
Abouaf Marc
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04479.x
Subject(s) - materials science , hot isostatic pressing , rheology , constitutive equation , porosity , composite material , ceramic , sintering , creep , shear (geology) , deformation (meteorology) , forging , metallurgy , finite element method , thermodynamics , physics
Rheology of a porous alumina was studied using sinter‐forging, hot‐pressing, and sintering tests. The results are analyzed using constitutive equations for porous materials. The deformation and densification rates are found to follow Coble creep behavior with an eventual control by interface reactions. The effect of porosity on shear and densification behavior is studied and compared to results obtained on metal powders showing similar trends for shear and a stronger influence in the case of densification. Large pores are likely to buckle at low densities when external forces are applied. The sintering pressure is also estimated and lies in the range 0 to 3 MPa. Finally, the constitutive equations are used to simulate hot isostatic pressing of test shapes, showing that the proposed model correctly predicts the deformation of the ceramic preforms.