Fabrication of an Yttria thin-wall tube by radial magnetic pulsed compaction of powder-based tapes

Abstract

Highly dense and homogeneous yttria (Y2O3) thin-wall tubes have been successfully fabricated by applying tape-casting and radial magnetic pulsed compaction (RMPC) followed by thermal sintering. Since a homogeneous density distribution was obtained in the RMPCed compact, by using the Y2O3-based tape instead of a stuck of raw powder, cracking and bending were inhibited throughout the process up to the final sintered body. The relative density of the resultant tube reached 99.9%, and the structure was very fine with grain sizes of 2∼5 μm. Moreover, when the granulated powder was used as the precursor of the tape, the thermal densification was promoted due to its enhanced sinterability as compared to the raw powder. © 2010 The Japan Institute of Metals.