Characterizing Granulated Ceramic Powders for Dry Pressing and Sintering

Ewsuk, Kevin G.; Argüello, Jose G.; Bencoe, Denise N.; Ellerby, Don; Glass, S. Jill; Zeuch, David H.; Anderson, Jeffrey C.

doi:10.1002/9781118371480.ch11

Cited by 3 publications

(20 citation statements)

References 21 publications

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“…Two of these precautions recommended by Ewsuk et.al. [13], (i.e., using a small surface area and avoiding use of a single-action uniaxial press) were apparently not followed in the fabrication of these standards. A uniaxially pressed ceramic powder cylinder with a smaller diameter than that of the standards was analyzed at Sandia National Laboratories (SNL), and distinct density gradients were found throughout the body of the powder compact [14].…”

Section: Uranium Isotopic Reference Standardsmentioning

confidence: 99%

Analysis of ISOCS Measurements to Establish Methodology Uncertainty

Smith¹,

Nutter²,

Hunneke³

2022

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Section: Uranium Isotopic Reference Standardsmentioning

confidence: 99%

Analysis of ISOCS Measurements to Establish Methodology Uncertainty

Smith¹,

Nutter²,

Hunneke³

2022

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“…When compared with aforementioned thermoplastic methods, dry powder methods are advantageous because of their small binder content and therefore are more ideally suited for the efficient production of large substrates. However, in their standard form, powder‐pressed ceramics typically have a uniform composition . Complex material variations are hard to achieve using traditional powder pressing mainly due to the difficulty in controlling the location of dry powder.…”

Section: Introductionmentioning

confidence: 99%

“…However, in their standard form, powder-pressed ceramics typically have a uniform composition. 13 Complex material variations are hard to achieve using traditional powder pressing mainly due to the difficulty in controlling the location of dry powder. Therefore, these methods are inefficient and not appropriate to build up ideal monolithic pieces with distinguished microstructural properties.…”

Section: Introductionmentioning

confidence: 99%

Optimization of dry powder deposition parameters for production of large substrates using functionally graded ceramics

Berkun

Kızıltaş

2018

Int J Applied Ceramic Tech

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The ability to control the spatial variation in three dimensions of dielectric properties is known to play a crucial role in achieving novel electromagnetic performance such as miniaturization and high gain of broadband antennas. To address this need, the objective in this paper is to use earlier proposed Dry Powder Deposition to produce large substrates of Functionally Graded Materials with spatially controlled CaTiO3‐MgTiO3‐Mg2TiO4 dielectrics. We present an in‐depth analysis and optimization of critical processing parameters such as compaction pressure, sintering temperature, and dwell time. Using the optimized compaction and co‐sintering process, spatially varying large (8.2 cm × 8.2 cm) substrates were produced without the presence of any significant cracks and warping. In addition to these structural functionalities, sintered ceramic constituents of the designed substrate display targeted dielectric permittivity values of a miniaturized broadband Satellite Communication Ultra High Frequency antenna at the optimized conditions. This optimized route opens up possibilities for multifunctional metrics to be addressed for other applications calling for different spatial distributions of large Functionally Graded Materials possibly with the same family of ceramic constituents.

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“…A combination of characterization and modeling are required to develop the fundamental scientific understanding required to achieve this goal. We have characterized the physical properties and characteristics of granulated ceramic powders [5][6][7], and their behavior during dry pressing [8][9] and sintering [6][7][10][11]. Additionally, measured constitutive behavior has been implemented within predictive models for powder compaction and sintering to better understand and control ceramic powder processing.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, measured constitutive behavior has been implemented within predictive models for powder compaction and sintering to better understand and control ceramic powder processing. [1,[12][13][14][15][16][17]. potential for net-shape forming, which makes it a cost-effective manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Controlled Ceramic Powder Compaction Through Science-Based Understanding

Ewsuk

Argüello

2004

KEM

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Reproducible manufacturing of ceramic components requires understanding and controlling materials and processing. Utilizing characterization and modeling to develop sciencebased understanding, significant advances have been made to better understand and control ceramic pressing powders, powder compaction, and sintering. This includes identifying some of the critical relationships between powder characteristics/properties, powder compaction behavior, and sintering. Another significant advance includes the development of computer simulation technology for compaction and sintering that provides guidance to improve process reproducibility and control. For powder compaction, a cap-plasticity constitutive model is implemented within a finite element (FE) framework. For sintering, a linear viscous sintering constitutive model is implemented within an FE framework. Both models have been tested and validated by comparing model predictions to experimental observations. The computer modeling technology developed can be used to improve and expand ceramic component designs, to help optimize powder pressing and sintering, and to anticipate and minimize defects during processing. The application of characterization and modeling technology to develop better powders and more robust processes will contribute to more reproducible, efficient, and cost effective manufacturing technology for ceramic components. Ceramic Powder Processing and ModelingDry Pressing. Because it is fast, simple, and well suited to high-volume production, powder pressing is commonly used to shape-form ceramic components [1-2]. Dry pressing also provides the

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Characterizing Granulated Ceramic Powders for Dry Pressing and Sintering

Cited by 3 publications

References 21 publications

Analysis of ISOCS Measurements to Establish Methodology Uncertainty

Analysis of ISOCS Measurements to Establish Methodology Uncertainty

Optimization of dry powder deposition parameters for production of large substrates using functionally graded ceramics

Controlled Ceramic Powder Compaction Through Science-Based Understanding

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