Microstructure and thermal conductivity of spark plasma sintering AlN ceramics

Abstract

Dense aluminium nitride ceramics were prepared by spark plasma sintering at a lower sintering temperature of 1700°C with Y₂O₃, Sm₂O₃ and Dy₂O₃ as sintering additives respectively. The effects of three kinds of sintering additives on the phase composition, microstructure and thermal conductivity of AlN ceramics were investigated. The results showed that those sintering additives not only facilitated the densification via the liquid phase sintering mechanism, but also improved thermal conductivity by decreasing oxygen impurity. Sm₂O₃ could effectively improve thermal conductivity of AlN ceramics compared with Y₂O₃ and Dy₂O₃. Observation by scanning electron microscopy showed that AlN ceramics prepared by spark plasma sintering method manifested quite homogeneous microstructures, but AlN grain sizes and shapes and location of secondary phases varied with the sintering additives. The thermal conductivity of AlN ceramics was mainly affected by the additives through their effects on the growth of AlN grain and the location of secondary phases.

Keywords

Aluminium nitride Sintering additives Spark plasma sintering Thermal conductivity

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References

Watari

Hwang

H. J.

Toriyama

and Kanzaki

: J. Mater. Res., 1999, 14, 1409–1417.

Jarrige

Lecompte

J. P.

Mullot

and Müller

: J. Eur. Ceram. Soc., 1997, 17, 1891–1895.

Shimizu

Hatano

Hyodo

and Egashira

: J. Am. Ceram. Soc., 2000, 83, 2793–2797.

Nakano

Watari

Hayashi

and Urabe

: J. Am. Ceram. Soc., 2002, 85, 3093–3095.

Jarrige

Bouzouita

Doradoux

and Billy

: J. Eur. Ceram. Soc., 1993, 12, 279–285.

Z. Y.

Liu

J. F.

Wang

and Zhang

Q. J.

: Mater. Sci. Technol., 2004, 20, 1097–1099.

Yue

Zhang

J. X.

and Wang

G. P.

: Mater. Sci. Technol., 2004, 20, 666–668.

Khor

K. A.

Cheng

K. H.

L. G.

and Boey

: Mater. Sci. Eng. A, 2003, A347, 300–305.

Y. L.

Zhang

and Zhang

J. X.

: Ceram. Int., 2009, 35, 2219–2224.

10.

Molisani

A. L.

Yoshimura

H. N.

Goldenstein

and Watari:

J. Eur. Ceram. Soc., 2006, 26, 3431–3440.

11.

Terao

Tatami

Meguro

and Komeya

: J. Eur. Ceram. Soc., 2002, 22, 1051–1059.

12.

Kume

Yasuoka

Omura

and Watari

: Ceram. Int., 2007, 33, 269–272.

13.

X. L.

Qin

M. L.

Farid

Humail

I. S.

and Qu

X. H.

: Mater. Sci. Eng. A, 2007, A460, 471–474.

14.

Kume

Yasuoka

Omura

and Watari

: J. Eur. Ceram. Soc., 2006, 26, 1831–1834.

15.

Terao

Tatami

Meguro

and Komeya

: J. Eur. Ceram. Soc., 2002, 22, 1051–1059.

16.

Kume

Yasulka

Lee

S. K.

Kan

Ogawa

and Watari

: J. Eur. Ceram. Soc., 2007, 27, 2967–2971.

17.

J. F.

Zhang

X. B.

Fei

Y. J.

H. F.

Y. F.

and Li

: Mater. Sci. Technol., 2007, 23, 875–879.

18.

Watari

Ishizaki

and Fujikawa

: J. Mater. Sci., 1993, 28, 3709–3714.

19.

Komeya

Inoue

and Tsuge

: J. Ceram. Soc. Jpn, 2000, 108, 94–100.

20.

Khor

K. A.

L. G.

and Murakoshi

: J. Eur. Ceram. Soc., 2005, 25, 1057–1065.

21.

Zhuang

H. R.

W. L.

S. Y.

Zhang

B. L.

and Fu

X. R.

: Mater. Sci. Eng. A, 2003, A342, 104–108.

22.

Qiao

Zhou

and Li

C. W.

: Mater. Sci. Eng. B, 2003, B99, 102–105.

23.

Mamoru

: Mater. Sci. Eng. A, 2000, A287, 183–188.

24.

Jarrige

Lecompte

J. P.

Mullot

and Müller

: J. Eur. Ceram. Soc., 1997, 17, 1891–1895.

25.

Tajika

Matsubara

and Rafanicllo

: J. Am. Ceram. Soc., 1999, 82, 1573–1575.