Gelcasting of Aluminum Nitride Using a Water-soluble Copolymer

doi:10.3724/SP.J.1077.2014.13488

Abstract

Abstract:

AlN ceramic was fabricated via a rapid gelation of AlN slurry and sintering in nitrogen at 1800 ℃ for 4 h. The AlN slurry was made of AlN powder, small amount of Y₂O₃ powder (sintering aid), deionized water. A new water-soluble copolymer of isobutylene and maleic anhydride (commercial name Isobam) was added into the slurry, and the resultant slurry gelled spontaneously in air at room temperature. The effects of Isobam and polyurethane on rheological properties and gelling behavior were evaluated. Results showed that concentrated AlN slurry (52vol%) with low viscosity (0.2 Pa·s) was obtained with an addition of 0.3wt% Isobam. The final AlN ceramic had a fin-like shape, a density of 3.33 g/cm³ and a thermal conductivity of 204 W/(m·K).

Key words: gelcasting, AlN, Isobam, rheological properties

CLC Number:

TQ174

SHU Xia, LI Jun, ZhANG Hai-Long, DONG Man-Jiang, SHUNZO Shi-Mai, WANG Shi-Wei. Gelcasting of Aluminum Nitride Using a Water-soluble Copolymer[J]. Journal of Inorganic Materials, 2014, 29(3): 327-330.

Figures/Tables 7

Fig. 1 Variation of pH in aqueous AlN slurries containing coated and uncoated AlN powders

Fig. 2 Effect of Isobam addition on Zeta potential of coated AlN powder

Fig. 3 Rheological curves of 52vol% AlN slurries with various Isobam additions

Fig. 4 Rheological curves of AlN slurries with 0.3wt% Isobam and different solids loadings

Fig. 5 Change of storage modulus during gelation

Fig. 6 Sintered AlN parts fabricated by gelcating

Fig. 7 Fractured surface of sintered AlN

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