Journal Article

FZJ-2021-03939

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Modelling of elimination of strength-limiting defects by pressure-assisted sintering at low stress levels

Wakai, F. (Corresponding author) ; Okuma, G. ; Mücke, R.FZJ* ; Guillon, O.FZJ*

2021
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/28824  doi:10.1016/j.jeurceramsoc.2021.09.040

Abstract: The 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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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)
2. SPP 1959:  Manipulation of matter controlled by electric and magnetic fields: Towards novel synthesis and processing routes of inorganic materials (274005202) (274005202)
3. DFG project 319339707 - Diffusionsgesteuerte Prozesse in polykristallinem Ceroxid: Kombinierte Wirkung von elektrischem Feld und mechanischer Belastung (319339707)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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