Corrigendum to “Sintering stresses and distortion produced by density differences in bi-layer structures” [J. Eur. Ceram. Soc. 26 (2006) 17–25]

Ravi, Deepthi; Green, D.J.

doi:10.1016/j.jeurceramsoc.2008.07.054

Cited by 4 publications

(6 citation statements)

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“…The electrolyte sinters more rapidly than the anode at the beginning of the thermal treatment, whereas at the end the anode catches up. This evolution of the curvature of a bi-layer is consistent with in-situ observations made by Ravi and Green [13] on tape cast Alumina layers. It is attributed to a difference in initial density in the different layers.…”

Section: Influence Of Sintering Kineticsupporting

confidence: 91%

Tape casting of proton conducting ceramic material

et al. 2008

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International audienceThis work explores experimental procedures for tape-cast proton conducting ceramic fuel cells (PCFC) based on Yttrium-doped Barium Cerate (BCY10). The work is based on several years experience on aqueous tape-casting applied to the shaping of YSZ-based SOFC: however, water-based tape casting of BCY10 appeared to be impracticable for reasons associated with the high basicity of this material that results in rapid hydrolysis when in contact with water. Organic tape casting was therefore developed for BCY10, but only on Electrolyte (BCY10)/Anode (BCY10 + NiO) half cells since up to now no cathode material is available. Planar 20 mm diameter circular half-cells were obtained with the aid of a small load on top of the bi-layer to counterbalance the inevitable warping of the samples. Back-scattered SEM and X-Ray computer-controlled microtomography showed sedimentation of some large grains in the green tapes which are believed to have formed by a mechanism associated with a porosity gradient. The deformation occurring during sintering was modelled taking into account the elastic, thermal, viscoplastic and sintering components of the total deformation. 2D and 3D Finite Element numerical simulations showed that the driving force for deformation is associated with this porosity gradient

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Section: Influence Of Sintering Kineticsupporting

confidence: 91%

Tape casting of proton conducting ceramic material

et al. 2008

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“…Here, it is imperative to point out that the strain incompatibility induces biaxial stresses at the interface, with their magnitudes depending on the materials properties, strain rate mismatch, geometrical parameters (for example, symmetric or asymmetric structure and high length-to-diameter ratio), and the size of the combined parts. [26] As the boundary area increases, the induced mismatch stress increases. [27] It is worthy to mention that a part of the mismatch-induced stresses could be accommodated by the plastic deformation of a soft (metal) layer, particularly when the layer thickness is thin.…”

Section: Methodsmentioning

confidence: 99%

Cosintering of Powder Injection Molding Parts Made from Ultrafine WC-Co and 316L Stainless Steel Powders for Fabrication of Novel Composite Structures

Simchi

Petzoldt

2009

Metall Mater Trans A

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Sintering response and phase formation during sintering of WC-Co/316L stainless steel composites produced by assembling of powder injection molding (PIM) parts were studied. It is shown that during cosintering a significant mismatch strain (>4 pct) is developed in the temperature range of 1080°C to 1350°C. This mismatch strain induces biaxial stresses at the interface, leading to interface delamination. Experimental results revealed that sintering at a heating rate of 20 K/min could be used to decrease the mismatch strain to <2 pct. Meanwhile, WC is decomposed at the contact area and the diffusion of C and Co into the iron lattice results in the formation of a liquid and MC and M 6 C carbides at 1220°C. Spreading of the liquid accelerates the reaction, affecting the dimensional stability of the PIM parts. To prevent the reaction, surface oxidation of the cemented carbide followed by hydrogen reduction during sintering was examined. Although the amount of mismatch strain increased, formation of a metallic interface consisting of a W-Co alloy (45 to 50 at. pct Co) and a Co-rich iron alloy (18 at. pct Co) prevented the decomposition of WC and melt formation. It is also shown that the deposition of a thin Ni layer after thermal debinding decreases the mismatch stresses through melt formation, although interlayer diffusion causes pore-band formation close to the steel part.

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“…For the case in which the shrinkage of the outer layer is greater than that of the inner layer, the maximum hoop stresses induced in the outer layer and inner layer can be calculated by the following equations 11,14 s h,max,outer~E d 2c…”

Section: Observation Of Specimensmentioning

confidence: 99%

Joining of two materials by powder injection moulding

Zhang¹,

Li²,

Li³

et al. 2009

Science and Technology of Welding and Joining

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Joining of components of cylindrical shape made of two materials chosen from Fe2Ni, 316L and M2 steels and manufactured by powder injection moulding (PIM) are studied in this paper. In general, joining of PIM cylindrical components requires that the to be joined outer part has a bigger shrinkage than the inner part during sintering. The sintered composite part consisting of Fe2Ni as outer layer and 316L as inner layer is a good example satisfying the above condition. Although the shrinkage of 316L and M2 are less than that of Fe2Ni, the composite parts with Fe2Ni as inner layer and 316L or M2 as outer layer can be successfully produced when different pretreatments are applied to Fe2Ni. Perfect diffusion joining without detectable pores in the vicinity of the bonding area is formed in Fe2Ni-1(or Fe2Ni-2)/316L(or M2) components. Diffusion of Cr and Ni elements has been verified by EDX analysis and it is shown that the diffusion accounts for the hardness of the transition zone.

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Corrigendum to “Sintering stresses and distortion produced by density differences in bi-layer structures” [J. Eur. Ceram. Soc. 26 (2006) 17–25]

Cited by 4 publications

References 0 publications

Tape casting of proton conducting ceramic material

Tape casting of proton conducting ceramic material

Cosintering of Powder Injection Molding Parts Made from Ultrafine WC-Co and 316L Stainless Steel Powders for Fabrication of Novel Composite Structures

Joining of two materials by powder injection moulding

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