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High-purity submicron alpha-Al2O3 armor ceramics - design, manufacture, and ballistic performance

 
: Krell, A.; Strassburger, E.

McCauley, J.W. ; American Ceramic Society -ACerS-, Westerville/Ohio:
Ceramic armor materials by design : Proceedings of the Ceramic Armor Materials by Design Symposium held at the Pac Rim IV International Conference on Advanced Ceramics and Glass, November 4 - 8, 2001 in Wailea, Maui, Hawaii
Westerville: ACerS, 2002 (Ceramic Transactions 134)
ISBN: 1-574-98148-X
pp.463-471
International Conference on Advanced Ceramics and Glasses (PAC RIM) <4, 2001, Wailea, Maui/Hawaii>
Ceramic Armor Materials by Design Symposium <2001, Wailea/Hawaii>
English
Conference Paper
Fraunhofer IKTS ()
Fraunhofer EMI ()
Keramik; ballistischer Schutz

Abstract
Neue Korundkeramiken mit einer Schutzwirkung nahe der von SiC und, vorzugsweise, mit hoher Transparenz (Durchsichtigkeit) können entwickelt werden, wenn kleinste Sub-Mikrometer Korngrößen der Sintergefüge mit minimaler Restporosität < 0.03 % verbunden werden. Um dieses Ziel zu erreichen, wurden unterschiedliche Herstellungen wie isostatisches Trockenpressen und Gießverfahren untersucht. Die ballistische Erprobung zeigt eine klare Korrelation verbesserter Schutzwirkung mit der steigenden Härte der feinkörnigsten Gefüge.

 

New grades of sintered corundum armor (.alpha.-Al2O3) have been designed here to obtain a ballistic mass efficiency close to SiC and, preferentially, to exhibit a high optical in-line transmission by assocg. (i) a small sub-micron grain size with (ii) a very high d. and (iii) purity, and (iv) a microstructure that is free of flaws. Different ceramic technologies like dry (cold isostatic) pressing and casting approaches (with the option of free shaping) are investigated with respect to these objectives. Results of ballistic tests give evidence of a strong correlation of protective efficiency and rising hardness in fine-grained sintered Al2O3.

: http://publica.fraunhofer.de/documents/N-15099.html