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Sintering of AlN Using CaO‐Al 2 O 3 as a Sintering Additive: Chemistry and Microstructural Development
Author(s) -
Hagen Eirik,
Yu Yingda,
Grande Tor,
Høier Ragnvald,
Einarsrud MariAnn
Publication year - 2002
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.1151-2916.2002.tb00565.x
Subject(s) - sintering , materials science , amorphous solid , ceramic , graphite , evaporation , porosity , metallurgy , limiting , microstructure , nitride , grain growth , grain size , chemical engineering , mineralogy , layer (electronics) , composite material , chemistry , crystallography , physics , engineering , thermodynamics , mechanical engineering
The densification of aluminum nitride using Ca 12 Al 14 O 33 as a sintering aid has been studied with emphasis on the effect of using coarse or fine powder, the amount of sintering aid, the sintering temperature, and embedding. Both crystalline and amorphous grain boundary phases were observed. Significant weight losses were observed for coarse‐grained samples, and if suitable embedding was not used. Porous and coarse‐grained ceramics with high contiguity and minor amounts of secondary phases were obtained by enhanced evaporation while dense ceramics were obtained limiting the evaporation. High weight losses in the graphite environment resulted in formation of a dense AlN surface layer.