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Combustion Synthesis of Aluminum Nitride Particles and Whiskers
Author(s) -
Bradshaw Steven M.,
Spicer John L.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02082.x
Subject(s) - whiskers , whisker , materials science , nitride , graphite , combustion , microstructure , chemical engineering , aluminium , dilution , carbon fibers , nitrogen , mass fraction , morphology (biology) , metallurgy , composite material , layer (electronics) , chemistry , composite number , organic chemistry , physics , genetics , biology , engineering , thermodynamics
Aluminum nitride (AlN) was produced via the combustion synthesis of loosely packed aluminum powder (pore fraction of ∼0.8) in a graphite reactor that was lined with permeable carbon felt. Almost‐complete conversion was achieved with a forced flow of nitrogen for beds 50‐150 mm deep (mass of 200‐650 g). The product was in the form of a loosely aggregated bed, with regions of distinct morphology, and had a predominantly whisker morphology. Some control over the microstructure was possible by changing the processing parameters. The addition of 5% of ammonia to the nitrogen resulted in a uniform production of whiskers, whereas a 50% solid‐phase dilution with AlN favored the production of particles.