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Bending Creep Test to Measure the Viscosity of Porous Materials during Sintering
Author(s) -
Lee SangHo,
Messing Gary L.,
Green David J.
Publication year - 2003
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.1151-2916.2003.tb03391.x
Subject(s) - creep , materials science , deflection (physics) , porosity , composite material , viscosity , flexural strength , inherent viscosity , porous medium , sintering , intrinsic viscosity , polymer , optics , physics
A bending creep test is proposed for measuring the change in viscosity of a porous material during densification. Equations, based on simple beam deflection theory, were derived to obtain the viscosity from a series of loading experiments using rectangular samples of different densities. By measuring the deflection in the center of the specimen between the spans, the viscosity of a porous material during densification can be measured. Experiments with porous Y 2 O 3 ‐stabilized ZrO 2 beams were used to illustrate the bending creep test. Consistent with theory the viscosity increased from 50 to 400 GPa·s as the sample densified from 87% to 98% density. The rapid increase in viscosity was considered to be a result of both densification and grain growth.