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000901963 1001_ $$0P:(DE-Juel1)173001$$aWakai, Fumihiro$$b0$$eCorresponding author
000901963 245__ $$aModelling of elimination of strength-limiting defects by pressure-assisted sintering at low stress levels
000901963 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2021
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000901963 520__ $$aThe structural reliability of sintered products depends on large defects introduced during powder processing, which cannot be removed by pressureless sintering. Here, we present a model how a large single ellipsoidal void is deformed, and finally disappears by pressure-assisted sintering. Taya-Seidel’s model is applied to predict the shrinkage of a large void in a compressible linear viscous material by using bulk viscosity, shear viscosity, and sintering stress that are determined experimentally for sintering of alumina powder at low stress levels. The application of mechanical stress promotes the densification rate. Its effect is maximum for hot isostatic pressing (HIP) and minimum for sinter forging. The effect is intermediate for hot pressing (HP) and spark plasma sintering (SPS), because the hydrostatic component of stress varies with densification. While a crack-like defect can be removed during densification, a spherical void must be eliminated by shear deformation in the final stage during dwell time.
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000901963 536__ $$0G:(GEPRIS)319339707$$aDFG project 319339707 - Diffusionsgesteuerte Prozesse in polykristallinem Ceroxid: Kombinierte Wirkung von elektrischem Feld und mechanischer Belastung $$c319339707$$x2
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000901963 7001_ $$0P:(DE-HGF)0$$aOkuma, Gaku$$b1
000901963 7001_ $$0P:(DE-Juel1)129641$$aMücke, Robert$$b2$$ufzj
000901963 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b3$$ufzj
000901963 773__ $$0PERI:(DE-600)2013983-4$$a10.1016/j.jeurceramsoc.2021.09.040$$gVol. 41, no. 16, p. 202 - 210$$n16$$p202 - 210$$tJournal of the European Ceramic Society$$v41$$x0955-2219$$y2021
000901963 8564_ $$uhttps://juser.fz-juelich.de/record/901963/files/postrefereedraft.pdf$$yPublished on 2021-09-20. Available in OpenAccess from 2023-09-20.
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