Shrinkage and properties of die pressed alumina produced from different granule sources

Somton, Kritkaew; Dateraksa, Kannigar; Laoratanakul, Pitak; McCuiston, Ryan C.

doi:10.1063/5.0023313

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Figure 1 shows the typical features of the alumina ceramic microstructure-characterized by a higher porosity, fewer points of contact among grains, and higher microstructure heterogeneity-and the zirconia-based MCZ and YSZ ceramics-with a greater compaction degree, i.e., densification of the material. Altogether the alumina micrographs show a multiformity of grains in size and geometry, which is illustrative of an incomplete sintering [26]. The grains were two typical sizes, the majority were small with a rounded and faceted shape, with a size up to 0.5 µm, and the others were larger with an elongated shape, with a width of up to 1 µm and length up to 1.8 µm.…”

Section: Particle Size Distribution and Microstructurementioning

confidence: 81%

“…During the sintering process, MA underwent the lowest C d value of 13.0%, followed by MCZ and YSZ (24.0% and 27.4%, respectively) (Table 1). Somton et al (2020) [26] studied the shrinkage and properties of die-pressed alumina produced from different powders sources, and achieved a contraction between 14.4% and 18.0%. Similarly, Shui et al (2002) [27] verified that, in the height and diameter directions, alumina-based ceramic showed linear contraction values between 15 and 20%.…”

Section: Particle Size Distribution and Microstructurementioning

confidence: 99%

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Holistic Characterization of MgO-Al2O3, MgO-CaZrO3, and Y2O3-ZrO2 Ceramic Composites for Aerospace Propulsion Systems

Shvydyuk,

Nunes-Pereira,

Rodrigues

et al. 2024

Ceramics

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Aerospace propulsion systems are among the driving forces for the development of advanced ceramics with increased performance efficiency in severe operation conditions. The conducted research focused on the mechanical (Young’s and shear moduli, flexural strength, hardness, and fracture toughness), thermal (thermal conductivity and coefficient of thermal expansion), and electric (dielectric properties) characterization of MgO-Al2O3, MgO-CaZrO3, and stable YSZ ceramic composites. The experimental results, considering structural and functional traits, underscore the importance of a holistic understanding of the multifunctionality of advanced ceramics to fulfill propulsion system requirements, the limits of which have not yet been fully explored.

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Section: Particle Size Distribution and Microstructurementioning

confidence: 81%

Section: Particle Size Distribution and Microstructurementioning

confidence: 99%

Holistic Characterization of MgO-Al2O3, MgO-CaZrO3, and Y2O3-ZrO2 Ceramic Composites for Aerospace Propulsion Systems

Shvydyuk,

Nunes-Pereira,

Rodrigues

et al. 2024

Ceramics

View full text Add to dashboard Cite

show abstract

“…This is followed by a high temperature process with a relatively low heating rate for sintering or calcining the material. These operations are accompanied by a significant degree of shrinkage (in the order of 20-30%) and porosity changes, and should be conducted carefully to tune the product properties (Kuang et al, 1997;Shang et al, 2015;Li H. et al, 2020;Somton et al, 2020). For shaping by whichever technology, the catalyst or sorbent powder is generally not cohesive enough, and does not possess the mechanical strength required to maintain the shape intended.…”

Section: Conventional Shaping Methodsmentioning

confidence: 99%

Review on Additive Manufacturing of Catalysts and Sorbents and the Potential for Process Intensification

Rosseau

Willemsen²,

Roghair

et al. 2022

Front. Chem. Eng.

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Additive manufacturing of catalyst and sorbent materials promises to unlock large design freedom in the structuring of these materials, and could be used to locally tune porosity, shape and resulting parameters throughout the reactor along both the axial and transverse coordinates. This contrasts catalyst structuring by conventional methods, which yields either very dense randomly packed beds or very open cellular structures. Different 3D-printing processes for catalytic and sorbent materials exist, and the selection of an appropriate process, taking into account compatible materials, porosity and resolution, may indeed enable unbounded options for geometries. In this review, recent efforts in the field of 3D-printing of catalyst and sorbent materials are discussed. It will be argued that these efforts, whilst promising, do not yet exploit the full potential of the technology, since most studies considered small structures that are very similar to structures that can be produced through conventional methods. In addition, these studies are mostly motivated by chemical and material considerations within the printing process, without explicitly striving for process intensification. To enable value-added application of 3D-printing in the chemical process industries, three crucial requirements for increased process intensification potential will be set out: i) the production of mechanically stable structures without binders; ii) the introduction of local variations throughout the structure; and iii) the use of multiple materials within one printed structure.

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“…Additionally, both ceramic composites MA1 and MA2 present an irregular shape of the grains and high porosity, which indicate an incomplete sintering [38,39]. This means that by increasing the milling time of the MA2 sample, we effectively decreased the particle size of the MA2 mixture and, in turn, increased the atomic diffusion.…”

Section: Microstructure Of the Fabricated Ceramicsmentioning

confidence: 99%

Plasma Actuators Based on Alumina Ceramics for Active Flow Control Applications

Rodrigues,

Shvydyuk,

Nunes-Pereira

et al. 2024

Ceramics

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Plasma actuators have demonstrated great potential for active flow control applications, including boundary layer control, flow separation delay, turbulence control, and aircraft noise reduction. In particular, the material used as a dielectric barrier is crucial for the proper operation of the device. Currently, the variety of dielectrics reported in the literature is still quite restricted to polymers including Kapton, Teflon, poly(methyl methacrylate) (PMMA), Cirlex, polyisobutylene (PIB) rubber, or polystyrene. Nevertheless, several studies have highlighted the fragilities of polymeric dielectric layers when actuators operate at significantly high-voltage and -frequency levels or for long periods. In the current study, we propose the use of alumina-based ceramic composites as alternative materials for plasma actuator dielectric layers. The alumina composite samples were fabricated and characterized in terms of microstructure, electrical parameters, and plasma-induced flow velocity and compared with a conventional Kapton-based actuator. It was concluded that alumina-based dielectrics are suitable materials for plasma actuator applications, being able to generate plasma-induced flow velocities of approximately 4.5 m/s. In addition, it was verified that alumina-based ceramic actuators can provide similar fluid mechanical efficiencies to Kapton actuators. Furthermore, the ceramic dielectrics present additional characteristics, such as high-temperature resistance, which are not encompassed by conventional Kapton actuators, which makes them suitable for high-temperature applications such as turbine blade film cooling enhancement and plasma-assisted combustion. The high porosity of the ceramic results in lower plasma-induced flow velocity and lower fluid mechanical efficiency, but by minimizing the porosity, the fluid mechanical efficiency is increased.

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Shrinkage and properties of die pressed alumina produced from different granule sources

Cited by 5 publications

References 3 publications

Holistic Characterization of MgO-Al2O3, MgO-CaZrO3, and Y2O3-ZrO2 Ceramic Composites for Aerospace Propulsion Systems

Holistic Characterization of MgO-Al2O3, MgO-CaZrO3, and Y2O3-ZrO2 Ceramic Composites for Aerospace Propulsion Systems

Review on Additive Manufacturing of Catalysts and Sorbents and the Potential for Process Intensification

Plasma Actuators Based on Alumina Ceramics for Active Flow Control Applications

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