Transparent ceramics green-microstructure optimization by pressure slip-casting: Cases of YAG and MgAl2O4

Boulesteix, Rémy; Goldstein, Adrian; Perrière, Camille; Maı̂tre, Alexandre; Katz, Mickael; Coureau, Christophe; Sallé, Christian

doi:10.1016/j.jeurceramsoc.2020.11.003

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…Under the pressure casting conditions, the slip in the polymer-based mould (with average pore size of about 10 µm) has to undergo a forced filtration resulting in the faster thickness built up. This observation is in agreement with the finding of the requirement of low viscosity and low yield point for a good control of the casting rate in order to obtain high relative density of the cast bodies [14].…”

Section: Rheological Behavioursupporting

confidence: 92%

“…A carbon-bonded alumina material with good thermal shock resistance was produced by pyrolyzing carbon. According to studies by various authors [10][11][12][13][14], the main variables that affect the casting rate are the application of pressure to the slip (or vacuum to the mould), the slips solid content, the resistance of the cast and mould to moulding (which is primarily determined by the porosity of the cast layer and mould) and the slips viscosity. The volume fraction of fines that can be added is practically constrained by the increased viscosity of suspensions caused by the addition of fine particles.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Rheological Behavioursupporting

confidence: 92%

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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“…Though gel casting enables green machining due to the formed gel network it suffers from the serious drawback of the use of toxic acrylamide based gelation agents [11][12][13]. On the other hand, dry processing techniques such as pressure assisted compaction process provide high green density values in combination with relatively higher green strength [14,15]. However, compacted bodies will end up with inhomogeneities and defects [16][17][18][19].…”

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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“…The main features of the highly sinterable powder compact are the small and narrow pore distribution dimensions, and this configuration must be strictly maintained throughout the macroscopic sample volume. Therefore, the steps of powder preparation, processing, and forming must be optimized and correlated to ensure proper management of the grinding of powder aggregates and uniform compact distribution of particles resulting from breaking aggregates [ 7 ]. Therefore, in order to meet the requirements, this paper presents the results of optimization of the sintering conditions by selecting the appropriate pressure (1–8 GPa), temperature (500–1350 °C), and sintering time (1–5 min), while maintaining a constant rate of temperature increase.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sintering Parameters on Spectroscopic Properties of BMW: Eu3+ Ceramic Materials Prepared by HPLT Technique

et al. 2022

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In this work, Ba2MgWO6: Eu3+ (BMW: Eu3+) ceramic materials with a double perovskite structure were sintered using the High-Pressure Low-Temperature sintering (HPLT) technique. As part of the research, the influence of pressure (CP), sintering temperature (CT), and sintering time (CTS) on the structure and luminescence of the doped BMW were determined. Structural analysis via XRD and SEM + EDS and spectroscopic analysis via emission and excitation spectra, decay time, and absorption spectra of the obtained ceramics were performed. Dense double perovskite ceramics were obtained with a cubic structure with optimal sintering parameters: T = 500 °C, p = 8 GPa, and t = 1 min. The increase in temperature caused an increased extinction of the luminescence due to the diffusion of carbon into the ceramics. The increase in pressure led to the formation of the amorphous phase, which increased the speed of non-radiative transitions and also led to the extinction of the luminescence. The increase in sintering time from 1 to 3 min enhanced the luminescence output, but when the ceramic was sintered for 5 min, the luminescence was quenched, most likely by increasing the rate of the non-radiative process, as evidenced by reduced decay time.

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Transparent ceramics green-microstructure optimization by pressure slip-casting: Cases of YAG and MgAl2O4

Cited by 16 publications

References 27 publications

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

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

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

Influence of Sintering Parameters on Spectroscopic Properties of BMW: Eu3+ Ceramic Materials Prepared by HPLT Technique

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Transparent ceramics green-microstructure optimization by pressure slip-casting: Cases of YAG and MgAl2O4

Cited by 16 publications

References 27 publications

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

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

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

Influence of Sintering Parameters on Spectroscopic Properties of BMW: Eu3+ Ceramic Materials Prepared by HPLT Technique

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Product

Resources

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

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