アルミナ顆粒粉の薄肉カップ成形と焼結体の高精度化

概要

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Deep cup shaped compacts of diameter: 20 mm, wall height: 30 mm and wall thickness: 2 mm, were formed by uniaxial pressing using a single stepped punch from loose alumina granule which could attain sufficient flowability by admixing more than 5 wt% liquid paraffin. Loose granule flowed for forming from higher densified cup at the bottom to a lower density at the cup wall at a certain compacting pressure by the addition of liquid paraffin. According to experimental results, the density of cup wall improved by increasing the addition of liquid paraffin and the difference in density distribution in green compact could be reduced. The dimensional variation on diameter of sintered compact formed by the addition of 6.7wt% liquid paraffin under compacting pressure 196 MPa could be 0. 24 mm by sintering for 3 hr at 1550°C.
社団法人粉体粉末冶金協会の論文