Abstract
A production of sintered compact with a square shaped cup is formed from alumina granule admixed with liquid paraffin could form by flow compaction. The powder flows from the bottom to the wall. In the case of single-action tooling by changing the bottom thickness, the maximum sintered density was 96.2 % in relative density by addition of liquid paraffin 12.5 mass%, compacting pressure of 150 MPa and the bottom thickness of 5 mm. The minimum difference of the width dimension of the sintered compact was 0.16 mm. In the case of floating die tooling by changing wall height, the maximum sintered density was 98.2 % in relative density by addition of liquid paraffin 12.5 mass%, compacting pressure of 100 MPa and wall height of 20 mm. The minimum difference of the width dimension of sintered compact was 0.07 mm, the value of which reached to an industrial revel. In comparison between the single-action tooling and the floating die tooling, the latter causes combining powder flow and double-action pressing effects. As a result of floating die tooling, the density of sintered compact becomes higher and the difference in width dimension of the sintered compact can be reduced.
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