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High pressure combustion synthesis of aluminum nitride

Published online by Cambridge University Press:  31 January 2011

Marc Costantino  and
Carlo Firpo
Marc Costantino
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
Carlo Firpo
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
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Abstract

We report initial results on the synthesis of monolithic aluminum nitride by burning Al–AlN mixtures in high pressure nitrogen. The objective is to synthesize economically large, near-theoretical density AlN parts. In this work, we begin with compacted mixtures of 10 μm Al and 3 μm AlN powder formed into 7.62 cm diameter by 3.81 cm thick disks having densities up to 60% of theoretical. Then, at N2 pressures up to 180 MPa (26 000 psi), we ignite the disk on one face. The fraction of Al converted to AlN, density, and severity of macroscopic cracking vary with N2 pressure and heat transfer from the sample. Presently, products are inhomogeneous, showing regions of relatively high porosity, regions with no porosity but with AlN in a matrix of Al, and regions of nearly theoretical density AlN.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2397 - 2402
Copyright
Copyright © Materials Research Society 1991

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