Interface Controlled Materials (RUEHLE:INTERFACE CONT.MAT O-BK) || Development of Al 2 O 3 -ZrO 2 Nanostructured Composites Using Pulsed Power Technologies

✍ Scribed by Rühle, M.; Gleiter, H.

• Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
• Year: 2005
• Weight: 134 KB
• Category: Article
• ISBN: 352760622X
• DOI: 10.1002/352760622x.ch28

✦ Synopsis

Fully dense Al 2 O 3 -ZrO 2 nanostructured composites were fabricated by a pulsed magnetic compaction and conventional sintering of the nano-sized powders. Two different approaches have been applied for production of the composite powders. Powders of the first group were prepared by mixing in the iso-propanol of a pure Al 2 O 3 powder produced by electrical explosion of wire, and a Y 2 O 3 -stabilized ZrO 2 produced by pulsed laser vaporization of target. Powders of the second group were prepared by pulsed laser evaporation of targets comprising mixtures of coarse Al 2 O 3 and 1.6YSZ particles. This treatment caused formation of nanosized particles in largely metastable states: amorphous Al 2 O 3 and Al 2 O 3 -Y 2 O 3 -ZrO 2 solid solutions. The sintered composite from the first group containing nearly equal volume fractions of Al 2 O 3 and 2.8YSZ phases 70 and 140 nm in size respectively proved to be the best. It was characterized by the maximum density and bending strength.