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Dispersion and Consolidation of the Colloidal Suspension in the Al2O3 Powder – Si3N4 Whisker System

Published online by Cambridge University Press:  21 February 2011

Yoshihiro Hirata ,
Shinichi Matsushita ,
Susumu Nakagan ,
Ichiro Haraguchi ,
Noriaki Hanada ,
Yoshimi Ishihara  and
Saburo Hori
Yoshihiro Hirata
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Shinichi Matsushita
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Susumu Nakagan
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Ichiro Haraguchi
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Noriaki Hanada
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Yoshimi Ishihara
Affiliation:
Kagoshima University, Department of Applied Chemistry 1–21–40 Korimoto, Kagoshima 890 JAPAN
Saburo Hori
Affiliation:
Kureha Chemical Industry Co. LTD., Advanced Material Systems Laboratory, 3-25-1 Hyakunincho, Shinjuku-ku, Tokyo 169 JAPAN
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Abstract

Whisker-reinforced ceramics have high potential for structural materials application due to their high fracture toughness and high mechanical strength. In this paper, rheological property and consolidation of the colloidal suspension in the alumina powder-silicon nitride whisker system were studied to control the microstructure and density of the green and hot-pressed composite. A12O3 particles of average diameter 0.15 μm and Si3N4 whisker of average size 0.4 μm × 3.7 μm were electrostatically dispersed in water in pH range 1–11 and consolidated by filtration. A welldispersed state of the composite suspension was achieved at low pH. Decreasing the viscosity while increasing the solid content of the suspension at the same time is the key step in making green compact with higher density and a narrower pore size distribution. These compacts were densified to relative density 98.4–99.4% by hot-pressing at 1500°C at a pressure of 39 MPa in N2 atmosphere.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 155: Symposium L – Processing Science of Advanced Ceramics , 1989 , 343
Copyright
Copyright © Materials Research Society 1989

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References

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