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Aluminum Nitride fibers from a Thermoplastic Organoaluminum Precursor

Published online by Cambridge University Press:  21 February 2011

John D. Bolt  and
Fred N. Tebbe
John D. Bolt
Affiliation:
E. I. du Pont de Nemours & Co., Experimental Station, E262, Wilmington, DE 19898
Fred N. Tebbe
Affiliation:
E. I. du Pont de Nemours & Co., Experimental Station, E262, Wilmington, DE 19898
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Abstract

A new organoaluminum polymer (EtAINH)n(Et2AlNH2)m·AlEt3 derived from triethylaluminum and ammonia, is thermoplastic at elevated temperatures and a glassy solid at ambient temperature. As a thermoplastic it can be processed in certain shapes, solidified, cured and transformed to dense aluminum nitride with retention of its shape. Aluminum nitride fibers are prepared by melt spinning the polymer, pyrolyzing in ammonia and at high temperature in nitrogen. The AlN microstructure forms as very fine particles at 400–600°C, coarsens at higher temperature, and densifies at 1600–1800 °C into polycrystalline AlN with submicron grains. Mechanical strength, thermal expansion and dielectric constant are consistent with bulk ceramic values. Initial thermal conductivity deduced from composite measurements is 82 W/m°K in fibers containing 0.5 to 1.0 percent oxygen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 108 , 1987 , 337
Copyright
Copyright © Materials Research Society 1988

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