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Materials 2016, 9(7), 529; doi:10.3390/ma9070529

Ceramic Spheres—A Novel Solution to Deep Sea Buoyancy Modules

1
Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
2
De Cavis AG, Dübendorf 8600, Switzerland
3
Almath Crucibles Ltd., Newmarket, Suffolk CB8 9NE, UK
4
Moulded Foams, Blackwood, Gwent South Wales NP12 2EU, UK
5
Plasto AS, Andalsnes 6300, Norway
6
Pera Technology, Melton Mowbray, Leicestershire LE13 0PB, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Jerome Chevalier
Received: 9 May 2016 / Revised: 21 June 2016 / Accepted: 24 June 2016 / Published: 29 June 2016
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [4034 KB, uploaded 29 June 2016]   |  

Abstract

Ceramic-based hollow spheres are considered a great driving force for many applications such as offshore buoyancy modules due to their large diameter to wall thickness ratio and uniform wall thickness geometric features. We have developed such thin-walled hollow spheres made of alumina using slip casting and sintering processes. A diameter as large as 50 mm with a wall thickness of 0.5–1.0 mm has been successfully achieved in these spheres. Their material and structural properties were examined by a series of characterization tools. Particularly, the feasibility of these spheres was investigated with respect to its application for deep sea (>3000 m) buoyancy modules. These spheres, sintered at 1600 °C and with 1.0 mm of wall thickness, have achieved buoyancy of more than 54%. As the sphere’s wall thickness was reduced (e.g., 0.5 mm), their buoyancy reached 72%. The mechanical performance of such spheres has shown a hydrostatic failure pressure above 150 MPa, corresponding to a rating depth below sea level of 5000 m considering a safety factor of 3. The developed alumina-based ceramic spheres are feasible for low cost and scaled-up production and show great potential at depths greater than those achievable by the current deep-sea buoyancy module technologies. View Full-Text
Keywords: ceramics; thin-walled hollow sphere; deep-water buoyancy modules ceramics; thin-walled hollow sphere; deep-water buoyancy modules
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jiang, B.; Blugan, G.; Sturzenegger, P.N.; Gonzenbach, U.T.; Misson, M.; Thornberry, J.; Stenerud, R.; Cartlidge, D.; Kuebler, J. Ceramic Spheres—A Novel Solution to Deep Sea Buoyancy Modules. Materials 2016, 9, 529.

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