Densification and thermal conductivity of AlN doped with Y{sub 2}O{sub 3}, CaO, and Li{sub 2}O

Journal Article · Sun Dec 01 00:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08083.x· OSTI ID:422714

Watari, Koji; Valecillos, M C; Brito, M E; Toriyama, Motohiro; Kanzaki, Shuzo ^[1]

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1. National Industrial Research Inst. of Nagoya (Japan). Dept. of Ceramics Science

Small amounts of Li{sub 2}O result in sintering in the AlN-Y{sub 2}O{sub 3}-CaO and AlN-CaO systems at firing temperatures <1,600 C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li{sub 2}O is removed by volatilization at temperatures from 1,300 to 1,600 C, and its content decreases several ppm from the initial 0.3 wt%. Li{sub 2}O-doped AlN specimens containing Y{sub 2}O{sub 3} and CaO additives are well densified by firing at 1,600 C for 6 h, and their thermal conductivity is 135 W{center_dot}m{sup {minus}1}{center_dot}K{sup {minus}1}. The effect of Li{sub 2}O addition on sintering and thermal conductivity also is discussed through thermodynamic considerations.

• Sponsoring Organization: USDOE
• OSTI ID: 422714
• Journal Information: Journal of the American Ceramic Society, Vol. 79, Issue 12; Other Information: PBD: Dec 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
SINTERING
THERMAL CONDUCTIVITY
YTTRIUM ADDITIONS
CALCIUM ADDITIONS
LITHIUM ADDITIONS
POWDERS
CHEMICAL COMPOSITION
MILLING
TEMPERATURE RANGE 1000-4000 K
EVAPORATION
THERMODYNAMICS
EXPERIMENTAL DATA