Effect of Solids Loading and Dispersant Concentration on Strain Mismatch and Deformation of Slip‐Cast Green Bodies

Yates, John D.; Lombardo, Stephen J.

doi:10.1111/j.1151-2916.2001.tb01002.x

Cited by 10 publications

(9 citation statements)

References 16 publications

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“…This effect of surface contamination may also be responsible, in some instances, for the difficulty in maintaining the flatness of thin samples without resorting to fixturing. Other mechanisms, such as density gradients, may also play a role in exacerbating differential shrinkage during sintering 30–32 …”

Section: Discussionmentioning

confidence: 99%

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Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Kim

Lombardo

Winholtz

2005

Journal of the American Ceramic Society

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Ceramic beams are induced in situ to form complex shapes at elevated temperature without the application of an external stress. This process has been demonstrated for thin alumina substrates coated with a layer of magnesia. The internal strain causing the substrates to deform at elevated temperature arises as a consequence of strain mismatch accompanying the penetration of the coating into the substrate. The magnitude of the deformation depends on the amount of coating applied, on the thickness of the substrate, on the density of the substrate, and on the temperature. During exposure of the beams to elevated temperature, the magnesia coating reacts with the alumina substrate to form the spinel phase; the resulting volume change accompanying the phase transformation is likely the predominant driving force for deformation.

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Section: Discussionmentioning

confidence: 99%

“…Other mechanisms, such as density gradients, may also play a role in exacerbating differential shrinkage during sintering. [30][31][32]…”

Section: Discussionmentioning

confidence: 99%

Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Kim

Lombardo

Winholtz

2005

Journal of the American Ceramic Society

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“…To control the kinetics of the casting process, applying a stepwise increase of the slip inlet pressure during slip casting can minimize this deviation of pressure drop. 8,25,26) Therefore, the resultant microstructure of the cake produced by a stepwise pressure loading will be more homogenous than the one of static pressure loading. In this work, the slip inlet loading was applied in five steps up to a maximum (0.5 MPa) and continuously water pumped to achieve a pressure of -0.05 MPa, which turned out to be the best casting conditions for the PVHSC process.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Large-Size Alumina by Pressure-Vacuum Hybrid Slip Casting

Cho¹,

Lee²

2013

Journal of the Korean Ceramic Society

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The size of various alumina ceramics used in the semiconductor and display industries must be increased to increase the size of wafers and panels. In this research, large alumina ceramics were fabricated by pressure-vacuum hybrid slip casting (PVHSC) employing a commercial powder, followed by sintering in a furnace. In the framework of the PVHSC method, the consolidation occurs not only by compression of the slip in the casting room but also by suction of the dispersion medium from the casting room. When sintered at 1650 o C for 4 h, the fabricated large-size alumina (1,550 × 300 × 30 mm 3) exhibited a dense microstructure corresponding to more than 99.2% of the theoretical density and a high purity of 99.79%. The flexural and compressive strengths of the alumina plate were greater than 340 MPa and 2,600 MPa, respectively.

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“…It is thought that this causes the reactions not to be completed especially during sintering at 1450 °C since packing and intergranular interactions between grains in a composition containing 45% solids by weight are low. One possible mechanism is segregation of particles of different sizes, which is increased when solid loading is low and, thus, hindered settling is reduced [27,28]. Another reason for this situation is the lack of any additive in the prepared mixture.…”

Section: Xrd Analyses Of the Mz045 Compositionmentioning

confidence: 99%

Characterization and production of slip casts mullite–zirconia composites

Aydın

Tokatas

2018

SN Appl. Sci.

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In this study, mullite-zirconia composites were prepared by reaction sintering of alumina, kaolinite zircon and colemanite powder. Slip casting method was also employed for production of these composites. Two different compositions were prepared with and without colemanite additive. The main purpose of this work was to determine the optimum conditions for mullite-zirconia synthesis in addition to the effects of starting composition, solid concentration of aqueous suspensions and sintering temperature. The resulting sintered materials were characterized in terms of bulk and relative density, firing shrinkage, XRD and SEM. XRD peaks suggested fully developed mullite and zirconia phases by reaction sintering of zircon, kaolinite, alumina and colemanite phases. Zircon usually dissociates at a temperature higher than 1650 °C. However, it has been shown in this study that zircon dissociates at about 1450 °C due to the presence of colemanite. The results of the study indicate that 90% of relative density was achieved as the solid concentration is increased up to 55% in case for slip-casted specimens with colemanite additive (MZC55 with 55% solid concentration). The microstructure of all composites is composed of irregularly shaped mullite grains and round-shaped zirconia grains which are distributed intragranularly and intergranularly.

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Effect of Solids Loading and Dispersant Concentration on Strain Mismatch and Deformation of Slip‐Cast Green Bodies

Cited by 10 publications

References 16 publications

Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Fabrication of Large-Size Alumina by Pressure-Vacuum Hybrid Slip Casting

Characterization and production of slip casts mullite–zirconia composites

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