Difference between revisions of "Ceramic foam"
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| + | [[File:Silicon-Carbide-SiC-Foam-1440x1080.jpg|thumb|SEM image of Silicon carbide foam (15x) from ERG Aerospace]] | ||
==Description== | ==Description== | ||
A stiff, lightweight foam made from ceramics. Ceramic foams are usually manufactured by impregnating open-cell polymer foams internally with ceramic slurry and then firing in a kiln, leaving behind only ceramic material. This produces an open-cell structure that has a very high porosity, with typically 75-95% of the volume consisting of void spaces. The strength of foamed material possesses a power law relationship to its density: for example, a 20% dense material is more than twice as strong as a 10% dense material. Surprisingly, foamed ceramics exhibit a toughness and strength that bulk ceramics do not have. This is because, when a crack occurs, its travel stops at an open-cell, rather than propagating through the material. | A stiff, lightweight foam made from ceramics. Ceramic foams are usually manufactured by impregnating open-cell polymer foams internally with ceramic slurry and then firing in a kiln, leaving behind only ceramic material. This produces an open-cell structure that has a very high porosity, with typically 75-95% of the volume consisting of void spaces. The strength of foamed material possesses a power law relationship to its density: for example, a 20% dense material is more than twice as strong as a 10% dense material. Surprisingly, foamed ceramics exhibit a toughness and strength that bulk ceramics do not have. This is because, when a crack occurs, its travel stops at an open-cell, rather than propagating through the material. | ||
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Foamed ceramic; | Foamed ceramic; | ||
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| + | Commercial products: Duocel (ERG); Techfil (Tech Ceramic) | ||
==Applications== | ==Applications== | ||
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* filtration of molten metal alloys | * filtration of molten metal alloys | ||
| − | ==Physical and Chemical Properties== | + | ==Physical and Chemical Properties== |
| + | * Resistant to acids and oxidation | ||
| + | * Relative density = 4-30% (compared to bulk material) | ||
| + | * Compressive strength = 2800 psi (Duocel Silicon carbide foam at 10-12% relative density) | ||
| + | * Mohs hardness = 9 (Duocel Silicon carbide foam at 10-12% relative density) | ||
==Resources and Citations== | ==Resources and Citations== | ||
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* Wikipedia: [https://en.wikipedia.org/wiki/Ceramic_foam Ceramic foam] | * Wikipedia: [https://en.wikipedia.org/wiki/Ceramic_foam Ceramic foam] | ||
* Tech Ceramic: [https://www.techceramic.com/products/ceramic-foams/ Ceramic foams] | * Tech Ceramic: [https://www.techceramic.com/products/ceramic-foams/ Ceramic foams] | ||
| − | * ERG: [https://ergaerospace.com/ceramic-foam/ Ceramic foam] | + | * ERG: [https://ergaerospace.com/ceramic-foam/ Duocel Ceramic foam] |
[[Category:Materials database]] [[Category:MWG]] | [[Category:Materials database]] [[Category:MWG]] | ||
Latest revision as of 12:41, 7 February 2024
Description
A stiff, lightweight foam made from ceramics. Ceramic foams are usually manufactured by impregnating open-cell polymer foams internally with ceramic slurry and then firing in a kiln, leaving behind only ceramic material. This produces an open-cell structure that has a very high porosity, with typically 75-95% of the volume consisting of void spaces. The strength of foamed material possesses a power law relationship to its density: for example, a 20% dense material is more than twice as strong as a 10% dense material. Surprisingly, foamed ceramics exhibit a toughness and strength that bulk ceramics do not have. This is because, when a crack occurs, its travel stops at an open-cell, rather than propagating through the material.
Synonyms and Related Terms
Foamed ceramic;
Commercial products: Duocel (ERG); Techfil (Tech Ceramic)
Applications
- thermal insulation, acoustic insulation
- adsorption of environmental pollutants
- filtration of molten metal alloys
Physical and Chemical Properties
- Resistant to acids and oxidation
- Relative density = 4-30% (compared to bulk material)
- Compressive strength = 2800 psi (Duocel Silicon carbide foam at 10-12% relative density)
- Mohs hardness = 9 (Duocel Silicon carbide foam at 10-12% relative density)
Resources and Citations
- American Elements: Foams
- Wikipedia: Ceramic foam
- Tech Ceramic: Ceramic foams
- ERG: Duocel Ceramic foam