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Densification and Thermal Conductivity of AIN Doped with Y 2 O 3 , CaO, and Li 2 O
Author(s) -
Watari Koji,
Valecillos Maria Cecilia,
Brito Manuel E.,
Toriyama Motohiro,
Kanzaki Shuzo
Publication year - 1996
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.1151-2916.1996.tb08083.x
Subject(s) - liquidus , sintering , thermal conductivity , doping , materials science , analytical chemistry (journal) , mineralogy , conductivity , chemistry , metallurgy , composite material , optoelectronics , alloy , chromatography
Small amounts of Li 2 O result in sintering in the AIN‐Y 2 O 3 ‐CaO and AIN‐CaO systems at firing temperatures <1600°C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li 2 O is removed by volatization at temperatures from 1300° to 1600°C, and its content decreases several ppm from the initial 0.3 wt%. Li 2 O‐doped AIN specimens containing Y 2 O 3 and CaO additives are well densified by firing at 1600°C for 6 h, and their thermal conductivity is 135 W . m −1. K −1 .The effect of Li 2 O addition on sintering and thermal conductivity also is discussed through thermo‐dynamic considerations.