Debinding from Thick Green Compact from Alumina and Dimensional Precision of Sintered Compact

Alumina fine powder (0.6 μm) is granulated by 3 mass% PVA. The granule admixed with liquid paraffin are formed by a single-action tooling to columnar-shaped green compact, diameter: 60 mm, height: 60 mm and mass: 450 g. Green density increases according to the content of liquid paraffin. Debinding of green compact admixed with a lot of liquid paraffin is succeeded without cracking on compact by thermal debinding technique after extracting liquid paraffin in an organic solvent to pre-baked compact. Sintered density and dimensional precision of sintered compact formed by flow compaction are improved by liquid paraffin content of 7.5 mass% and by compacting pressure of 98 MPa.