Aqueous Processing of AlN Powder


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For the production of ceramics containing AlN as a major or minor constituent it is necessary to avoid hydrolysis. To do that, non-aqueous powder processing is required or waterresistant AlN powders must be used. Alternatively, as in the Hydrolysis Assisted Solidification (HAS) process, which exploits the hydrolysis of the AlN for the solidification of the ceramic suspensions, the hydrolysis has to be prevented at room temperature but initiated at elevated temperatures. In this work a systematic study of AlN powder reactivity in water and other aqueous environments is presented. The AlN hydrolysis was investigated by measuring the pH of diluted suspensions and by analysis of the reaction products. The results indicate possible solutions for control of the reaction with water in order to exploit it or to prevent it to enable aqueous AlN powder processing.



Edited by:

Hasan Mandal




K. Krnel and T. Kosmač, "Aqueous Processing of AlN Powder", Materials Science Forum, Vol. 554, pp. 189-196, 2007

Online since:

August 2007




[1] P. Bowen, J. G. Highfield, A. Mocellin and T. A. Ring: J. Am. Ceram. Soc. 73 (3) (1990), pp.724-728.

[2] T. Reetz, B. Monch and M. Saupe: Ber. DKG, 68 [11-12] 464-465 (1992).

[3] M. Uenishi, Y. Hashizume and T. Yokote: Aluminium Nitride Powder Having Improved Water-Resistance, U.S. Pat. 4, 923, 689, May 8, (1990).

[4] K. Wefers and C. Misra: Oxides and Hydroxides of Aluminum, Technical Paper 19 (revised 1987) available from Alcoa, Pittsburg, PA.

[5] T. Graziani and A. Belosi: Mater. Chem. Phys. 35 (1993), p.43.

[6] W. M. Mobley: Colloidal Properties, Processing and Characterization of Aluminum Nitride Suspensions, Ph.D. Thesis Alfred University, Alfred, NY (1996).

[7] Groat, E. A. and Mroz Jr.: J. Ceramic Industry (March 1990), pp.34-38.

[8] Reed J. S.: Introduction to the Principles of Ceramic Processing. John Wiley & Sons, New York, (1988).

[9] T. Kosmač, S. Novak and M. Sajko: J. Europ. Ceram. Soc. 17 (1997), pp.427-432.

[10] T. Kosmač, S. Novak and K. Krnel: Z. Met. kd. 92 (2001), pp.150-11 as received Si 3N 4 leached Si 3N 4 as received SiC heat treated SiC pH time.

[11] K. Krnel and T. Kosmač: J. Mater. Res., 19 (2004), pp.1157-163.

[12] K. Krnel and T. Kosmač: J. Am. Ceram. Soc. 83 (2000), pp.1375-1378.

[13] K. Krnel and T. Kosmač: J. Eur. Ceram. Soc 21 (2001), p.2075-(2079).

[14] K. Krnel and T. Kosmač: J. Am. Ceram. Soc. 85 (2002), pp.484-486.

[15] H. Görter, J. Gerretsen, and R. A. Terpstra:, 3rd Euroceramics V1, 615-620, Faenza Editrice Iberica, S. C, (1993).

[16] M. Egashira, Y. Shimizu and S. Takasuki: J. Mater. Sci. Let. 10 (1991), pp.994-996.

[17] S. Fukumoto, T. Hookabe and H. Tsubakino: J. Mater. Sci. 35 (2000), pp.2743-2748.

[18] T. Reetz, B. Monch, and M. Saupe: Ber. Dtsch. Keram. Ges., 68 (1992), 464-65.

[19] G. D. Davis, J. S. Ahearn, J. D. Venables: J. Vac. Sci. Technol. A, 2 (1984), pp.763-766.

[20] J. G. Highfield and P. Bowen: Anal. Chem. 61 (1989), p.2399.

[21] A. I. Omoike and G. W. Vanloon: Wat. Res. 33 (1999), p.3617.

[22] S. M. Olhero, S. Novak, M. Oliviera, K. Krnel, T. Kosmač and J. M. F. Ferreira: J. Mater. Res., 19 (2004), pp.746-751.

[23] K. Krnel and T. Kosmač: Z. Met. kd., in press.

[24] K Krnel and T. Kosmač: Ceramic Processing Science (Ceramic Transactions, vol 83), The American Ceramic Society, Westerville 257-264 (1998).

[25] P. Greil: Materials Science and Engineering A109 (1989), pp.27-53.

[26] K. Krnel and T. Kosmač: Mater. Sci. Forum 413 (2003), pp.75-80.