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Gelcasting of Aluminum Nitride Ceramics
Author(s) -
Xue Jianfeng,
Dong Manjiang,
Li Jun,
Zhou Guohong,
Wang Shiwei
Publication year - 2010
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.1551-2916.2009.03489.x
Subject(s) - dispersant , materials science , slurry , green body , sintering , ceramic , relative density , rheology , composite material , nitride , viscosity , chemical engineering , dispersion (optics) , physics , layer (electronics) , optics , engineering
Aluminum nitride (AlN) ceramics has been prepared by nonaqueous gelcasting in air and sintering in nitrogen atmosphere. The influence of pH and dispersant on the ζ potential of AlN–ethanol slurry was studied. And the rheological behavior of the slurry was evaluated to optimize the dispersant content and solid loading. Concentrated AlN slurry (53.8 vol%) with low viscosity was prepared using polyethyleneimine as the dispersant. Sorbitol polyglycidyl ether and tetraethylenepentamine were used as gelling and hardening agents, respectively. A green body with a relative density of 63.3% was obtained. After sintering at 1800°C for 4 h, AlN ceramics with a relative density of 99.6% and a thermal conductivity of 200 W·(m·K) −1 were produced.