The effect of plaster composition and binder concentration on strain mismatch and deformation of slip-cast green bodies

Yates, John D.; Lombardo, Stephen J.

doi:10.1016/s0921-5093(02)00049-7

Cited by 8 publications

(7 citation statements)

References 28 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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“…However, only a few studies have focused on to controlling the pore microstructures by tuning the composition of slurries. It is known that the organic additives used in tape casting, slip casting, and gel casting have a considerable effect on the microstructures and properties of ceramics 14–17 . Thus, it can also be conjectured that the organic additives also have considerable effect on the porosity, pore size, pore morphology as well as the properties of the freeze‐cast ceramics.…”

Section: Introductionmentioning

confidence: 99%

Properties of Microstructure‐Controllable Porous Yttria‐Stabilized Ziroconia Ceramics Fabricated by Freeze Casting

Zuo

Zeng

Jiang

2008

Int J Applied Ceramic Tech

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Porous yttria-stabilized ziroconia (YSZ) ceramics were fabricated by freeze casting using aqueous ceramic slurries. Polyvinyl alcohol (PVA) was added to the slurry with the aim of controling the microstructures and properties of the porous YSZ ceramics. The experimental results indicated that the large and noninterconnected lamellar pores of YSZ ceramics without PVA transformed changed into small and interconnected lamellar pores with PVA addition. The porosities of YSZ ceramics with PVA addition were higher than those of YSZ ceramics without PVA addition. The compressive strength of porous YSZ ceramics is the range from 23.57 to 63.86 MPa. All specimens exhibit noncatastrophic failure behaviors.

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“…This free shrinkage gradient induces a stress profile in the plate which, in turn, results in the formation of a compression layer in the inner region of the plate and tension layers near the upper and lower surfaces, which result in cracking and distortions. [27][28][29] Therefore, we employed a slow drying rate with high humid conditions (80% relative humidity) in this work. Figure 4 and Table 1 reveal the green density from the bottom to the top of the alumina cast body.…”

Section: Resultsmentioning

confidence: 99%

“…Deformation arises as varying parts of the body shrink to different extents which, in turn, can be related to spatial variations in density within the component. 26,29) Figure 5 shows photographs of the large-size alumina specimen that was prepared by PVHSC from aqueous slurry and sintered at 1650 o C for 4 h in air. Linear shrinkages of the alumina plate (1,555 × 300 × 30 mm 3 ) were about 16.4%, 16.1%, and 15.5% along the length, width and thickness directions, respectively.…”

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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The effect of plaster composition and binder concentration on strain mismatch and deformation of slip-cast green bodies

Cited by 8 publications

References 28 publications

Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Strain‐Induced Deformation in Magnesia–Alumina Layered Composites

Properties of Microstructure‐Controllable Porous Yttria‐Stabilized Ziroconia Ceramics Fabricated by Freeze Casting

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

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