Anisotropy in the compression strength of hot-pressed ceramics

It is well documented that the hot-pressing procedures used for many strategic ceramics may introduce microstructural texturing that can lead to anisotropic mechanical properties. Therefore, knowing the existence and extent of anisotropy and any potential impact on properties is important to proper...

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Bibliographic Details
Published in:Journal of materials science 2023-10, Vol.58 (40), p.15603-15616
Main Authors: Swab, Jeffrey J., Pittari, John J., Meredith, Christopher S.
Format: Article
Language:English
Subjects:
Anisotropy
Boron carbide
Carbides
Ceramic materials
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Compressive strength
Crystallography and Scattering Methods
Flexural strength
Fracture toughness
Materials Science
Mechanical properties
Polymer Sciences
Pressing
Silicon carbide
Solid Mechanics
Strategic materials
Texturing
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Summary:It is well documented that the hot-pressing procedures used for many strategic ceramics may introduce microstructural texturing that can lead to anisotropic mechanical properties. Therefore, knowing the existence and extent of anisotropy and any potential impact on properties is important to proper application of these ceramics. Many hot-pressed ceramics are produced as plates that are relatively thin (around 25 mm or less). This makes it challenging to identify anisotropy in commonly measured properties such as flexure strength and fracture toughness since the standard beam specimens used to determine these properties are typically more than 25 mm in length. However, the use of a small dumbbell-shaped specimen has been successfully useful to determine the compression strength of several advanced ceramics. In this study, small dumbbell specimens were machined from a hot-pressed boron carbide and three hot-pressed silicon carbides. The major axis of the specimen was aligned at 0° (vertical), 45°, or 90° (horizontal) to the hot-pressing direction to determine any potential intrinsic anisotropy in the compression strength. Specimens were tested across a range of strain rates to discern the presence of rate effects on the compressive strength and fracture behavior of these strategic materials.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-023-09011-3