Pressure Slip Casting of Submicron Alumina Powder

Shunzo Tashima, Hiroyuki Suzuki, Hidenori Kuroki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Compacts are formed by pressure (0.9MPa) slip casting from a submicron Al2O3 powder using sheet filter. The process is compared with the conventional one using plaster mold. Two types of filters are; 1. acetyl-cellulose sheet with the thickness of 125μm and the hole size of 0.2 μm backed by a plate of porous aluminum; 2. plaster mold reinforced by analuminum tube. An Al2O3 powder with the average particle size of 0.22μm and the purity of 99.99% is dispersed in a ball mill to prepare slips with coefficients of viscosity in the range of 400~600mPa⋅sec. The results obtained are summarized as followes: 1. The rate of increase in the depth of the cake formed from the slip is represented by a constant K=L2/t (L:the thickness of the cake [mm], t:the time [min]). The value of K is 0.08mm2/min in conventional slip casting with the plaster mold and about 1.0mm2/min in pressure slip casting with the plaster mold or the cellulose sheet. 2. The sintering of the compacts are obstracted by the contamination from a plaster mold. The thickness of the contaminated layer in the compacts is about a few millimeter from the cake-mold interface. 3. Density of 99 to 99.5% and bending strength above 700MPa are obtained in the alumina compacts sintered at 1250°C for 1.5hr, in the pressure slip casting with the acetyl-cellulose sheet filter.

Original languageEnglish
Pages (from-to)3-7
Number of pages5
Journaljournal of the japan society of powder and powder metallurgy
Volume40
Issue number1
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Plaster
Aluminum Oxide
Powders
Casting
Alumina
Cellulose
Ball mills
Aluminum
Bending strength
Contamination
Sintering
Particle size
Viscosity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

Cite this

Pressure Slip Casting of Submicron Alumina Powder. / Tashima, Shunzo; Suzuki, Hiroyuki; Kuroki, Hidenori.

In: journal of the japan society of powder and powder metallurgy, Vol. 40, No. 1, 1993, p. 3-7.

Research output: Contribution to journalArticle

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abstract = "Compacts are formed by pressure (0.9MPa) slip casting from a submicron Al2O3 powder using sheet filter. The process is compared with the conventional one using plaster mold. Two types of filters are; 1. acetyl-cellulose sheet with the thickness of 125μm and the hole size of 0.2 μm backed by a plate of porous aluminum; 2. plaster mold reinforced by analuminum tube. An Al2O3 powder with the average particle size of 0.22μm and the purity of 99.99{\%} is dispersed in a ball mill to prepare slips with coefficients of viscosity in the range of 400~600mPa⋅sec. The results obtained are summarized as followes: 1. The rate of increase in the depth of the cake formed from the slip is represented by a constant K=L2/t (L:the thickness of the cake [mm], t:the time [min]). The value of K is 0.08mm2/min in conventional slip casting with the plaster mold and about 1.0mm2/min in pressure slip casting with the plaster mold or the cellulose sheet. 2. The sintering of the compacts are obstracted by the contamination from a plaster mold. The thickness of the contaminated layer in the compacts is about a few millimeter from the cake-mold interface. 3. Density of 99 to 99.5{\%} and bending strength above 700MPa are obtained in the alumina compacts sintered at 1250°C for 1.5hr, in the pressure slip casting with the acetyl-cellulose sheet filter.",
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