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Sintered alumina - hard and strong like hot-pressed Al2O3/TiC-composites

: Krell, A.; Blank, P.

Hausner, H.; Messing, G.L.; Hirano, S. ; American Ceramic Society -ACerS-, Westerville/Ohio:
Ceramic Processing Science and Technology. Proceedings of the fifth International Conference on Ceramic Processing Science and Technology
Westerville: ACerS, 1995 (Ceramic Transactions 51)
ISBN: 0-944904-89-0
International Conference on Ceramic Processing Science and Technology <5, 1994, Friedrichshafen>
Fraunhofer IKTS ()
Al2O3; alumina; Defektstruktur; Festigkeit; flaw population; grain size effect; hardness; Härte; Korngrößeneinfluß; powder characteristic; powder processing; Pulvercharakteristik; Pulververarbeitung; sintering; Sinterkorund; Sintern; strength

Pressureless sintered alumina compacts with high density and with a submicron microstructure are presented with a hardness that approaches or even exceeds the level of advanced hot-pressed Al203 + 35 vol.-% TiC composites; the strength of both ceramics is approximately the same. The investigation of different forming processes shows that quasi-conventional powder processing can be used to produce such outstanding alumina bodies instead of economically problematic sollgel or gel-casting routes. However, powder processing does not only provide advantages in the commercial field but presents major merits in improved properties of the produced bodies: A high homogeneity of the density avoids the typical 1-20 micrometer large pore clusters of submicron sol/gel microstructures. This homogeneity is essential for the production of macroscopic parts with narrow tolerances of mechanical properties.