Shape Precision of Eccentric Spherical Surface on Square Columnar-Shaped Sintered Compact from Alumina Granule by Flow Compaction

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  • 流動成形した正方形角柱アルミナ焼結体のもつ偏心球面の形状精度
  • リュウドウ セイケイシタ セイホウケイ カクチュウ アルミナ ショウケツタイ ノ モツ ヘンシン キュウメン ノ ケイジョウ セイド

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Abstract

Alumina granule admixed with liquid paraffin was formed by flow compaction to square columnar-shaped green compact with eccentric and concentric spherical surfaces. The maximum sintered density was 96.6% on relative density by addition of liquid paraffin 2.5 mass% and compacting pressure of 98 MPa. Outer diameter of sintered compact was shrunk from green compact to 18%. The height from center of concentric spherical surface of sintered compact was shrunk from green compact to 18.7%. The height from center of eccentric spherical surface on sintered compact was shrunk from green compact to 18.5%. The difference of the shape precision of eccentric spherical surfaces at thin side on sintered compact by liquid paraffin content of 2.5 mass% and 5.0 mass% was not recognized. The difference of the shape precision between thin side and thick side of eccentric spherical surface on sintered compact by liquid paraffin content of 2.5 mass% was not recognized, it appeared the effect of flow compaction. However, in case of liquid paraffin content of 5.0 mass% exceeded the optimum value, the shape of thick side of eccentric spherical surface on sintered compact was smaller diameter than the shape of thin side.

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