Pressure slip casting and cold isostatic pressing of aluminum titanate green ceramics: A comparative evaluation

Papitha, Ramanathan; Suresh, M. Buchi; Rao, Yebaluri Srinivas; Saha, Bhaskar; Das, Dibakar; Johnson, Roy

doi:10.2298/pac1304159p

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The samples were then allowed to cool before further studies. Mechanical Characterizations Density -In accordance to ASTM C 20-87, density of the sintered samples were determined by dimensional analysis using Equation 3.1 (Papitha et al, 2013). After sintering, the samples were first weighed and the volume was measured by displacement method using graduated cylinder (Sutcu, 2004).…”

Section: Blending Pressing and Sinteringmentioning

confidence: 99%

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Sanusi¹,

Dauda²,

Sumaila³

et al. 2018

Aceh Int. J. Sci. Technol

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-The research aims to study and optimize the formulation of materials required for advanced ceramic production using response surface methodology (RSM). In this research effort, the five (5) process independent variables studied with their corresponding levels are: Antang corundum powder, A (92.2 -100 %W); polyvinyl alcohol, B (0 -5 %W); CaO, C (0 -2.3 %W); MgO, D (0 -0.5 %W);and the sintering temperature, E (1200 -1500 °C).The mechanical property responses determined were density, ρ, compressive strength, C/S,flexural strength, F/S; which are key characteristics of ceramics for armour applications. The optimized density, compressive strength and flexural strength of the sintered Antang corundum are 3.45 g/cm 3 g, 1982 MPa and 295 MPa respectively; while the respective RSM prediction values are 3.46 g/cm 3 g, 1979 MPa and 286 MPa. The optimum material compositions from the experiment were Corundum, 95.66 %W; PVA, 2.78 %W; CaO, 1.28 %W; MgO, 0.28 %W at a Sintering Temperature of 1500 °C.On comparing the determined optimum mechanical responses of the sintered Antang ceramic with the maximum RSM prediction values, there is high level of assurance in using RSM for the formulation processing ceramic armour development.

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Section: Blending Pressing and Sinteringmentioning

confidence: 99%

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Sanusi¹,

Dauda²,

Sumaila³

et al. 2018

Aceh Int. J. Sci. Technol

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“…However, compacted bodies will end up with inhomogeneities and defects [16][17][18][19]. Pressure assisted slip casting is gaining interest as a process which permits application of pressure during the cast formation combining the advantages of colloidal forming and dry processing [20,21].…”

Section: Introductionmentioning

confidence: 99%

Investigations on colloidal and dry formed alumina parts under pressure and pressure-less conditions

Raju

Biswas

Khanra

et al. 2022

PAC

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Pressure assisted casting of advanced ceramics is an emerging preparation technique as it permits using a colloidal slips in shaping under pressure. Application of pressure provides flexibility in forming of complex shapes in combination with high homogeneity, superior green density, strength and high productivity. Current study compares conventional slip casting (CSC), pressure slip casting (PSC) and cold isostatic pressing (CIP) used for preparation of alumina green bodies. Since particle size is a limitation in PSC process due to the defined pore size of the mould, the same starting alumina powder obtained by mixing of powders with two different average particle size (7 ?m and 1.43 ?m) in the proportion of 65:35 was employed in all three processes. Green densities of 65%TD at 35 bar in case of PSC and 66%TD at 1200 bar after CIP were obtained; however, density of the CSC samples was only 50%TD. Flexural strength and fractographic studies were carried out and correlated with the respective processes. The samples were also sintered at 1600 ?C to evaluate their sinterability.

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“…Basic requirement for obtaining densely packed green products is to have a stabilised slip. The influence of deflocculant and the solid loading on the packing behaviour of a bimodal particle size distribution indicating the possibility of migration of coarser particles in opposite direction during casting with the consolidated layer acting like sieve [6,22,23]. Pressure casting is well practiced for traditional ceramics, as most of compositions are based on the clay with platelike morphology which reinforces through inter-locking to retain the shape while demoulding [5,24].…”

Section: Introductionmentioning

confidence: 99%

Pressure slip cast processing of alumina (Al₂O₃) products and comparative evaluation of mechanical properties

Raju

Khanra

Suresh

et al. 2022

Advances in Applied Ceramics

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Pressure Slip Casting (PSC) using polymer moulds offers several advantages over Conventional Slip Casting (CSC) of ceramics such as enhanced productivity in combination with higher green density, homogeneity and low rejections. PSC is currently practiced in table-ware industries however, application to the technical ceramics is limited owing to the collapse of cast part while de-moulding during pressure cast cycle under pneumatic pressure. Current study focuses on this key issue and demonstrated pressure casting process successfully for the fabrication of alumina parts. Slips of a mixture of alumina with different particle sizes in the various proportions and solid loadings were prepared. Slip under PSC resulted in effective interlocking of the particles retaining the shape while de-moulding and achieved a sintered density of 98.6% of theoretical density (TD). Slurry on CSC exhibited a lower sintered density of 97% of TD. Selection of particles with sizes in optimised proportion for PSC results in effective interlocking of particles in green parts as well as grains on sintering as revealed by the microstructure. This leads to higher density and mechanical properties. Slip thus optimised were shaped into solid spheres of f 60 mm by PSC targeting grinding applications.

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Pressure slip casting and cold isostatic pressing of aluminum titanate green ceramics: A comparative evaluation

Cited by 8 publications

References 24 publications

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Investigations on colloidal and dry formed alumina parts under pressure and pressure-less conditions

Pressure slip cast processing of alumina (Al₂O₃) products and comparative evaluation of mechanical properties

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Pressure slip casting and cold isostatic pressing of aluminum titanate green ceramics: A comparative evaluation

Cited by 8 publications

References 24 publications

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Investigations on colloidal and dry formed alumina parts under pressure and pressure-less conditions

Pressure slip cast processing of alumina (Al2O3) products and comparative evaluation of mechanical properties

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Pressure slip cast processing of alumina (Al₂O₃) products and comparative evaluation of mechanical properties