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Plasma activated sintering of additive-free AlN powders to near-theoretical density in 5 minutes

Published online by Cambridge University Press:  31 January 2011

Joanna R. Groza ,
Subhash H. Risbud  and
Kazuo Yamazaki
Joanna R. Groza
Affiliation:
Division of Materials Science and Engineering, Department of Mechanical, Aeronautical, and Materials Engineering, University of California at Davis, Davis, California 95616-5294
Subhash H. Risbud
Affiliation:
Division of Materials Science and Engineering, Department of Mechanical, Aeronautical, and Materials Engineering, University of California at Davis, Davis, California 95616-5294
Kazuo Yamazaki
Affiliation:
Division of Materials Science and Engineering, Department of Mechanical, Aeronautical, and Materials Engineering, University of California at Davis, Davis, California 95616-5294
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Abstract

AlN powders (particle size = 0.44 ± 0.08 μm) containing no deliberate sintering additives were consolidated to near theoretical density in 5 min at 2003 K (1730 °C) using a Plasma Activated Sintering (PAS) process. PAS is a novel consolidation method that combines a very short time at high temperature with pressure application in a plasma environment. The in situ cleaning ability of powder particle during plasma activated densification leads to enhanced particle sinterability. The densities of undoped AlN specimens that were PAS consolidated at 2003 K for 5 min under 50 MPa pressure ranged from 97.5 to 99.3% of theoretical. The initial submicron particle size of AlN powders was retained in the final microstructure that consisted of polycrystalline grains with an average size of ≍0.77 ± 0.1 μm.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2643 - 2645
Copyright
Copyright © Materials Research Society 1992

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