Fabrication of High Density Y_2O_3 Ceramics by Magnetic Pulsed Compaction

摘要

Highly dense Y_2O_3 ceramics have been fabricated by a magnetic pulsed compaction (MPC) which is capable of reaching a sufficiently high pressure (～1GPa) in a very short duration (a few microseconds), and a subsequent pressureless sintering at 1600℃. The Y_2O_3 green bodies with a relative density of about 68% were achieved by the application of the MPC process due to the effect of an enhanced rearrangement and a high speed movement of the particles, without the help of ceramic binder. Those compacts showed densities greater than 95%, which is very close to the theoretical density, after the subsequent pressureless sintering process at 1600 ℃. The shrinkage rates of the diameter for the samples compacted by the MPC process were markedly reduced, when compared to those for the ones by the conventional compaction (CC) process.