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Processing of Aqueous Aluminum Nitride Suspensions with High Solid Loading
Author(s) -
Wildhack Stefanie,
Rixecker Georg,
Aldinger Fritz
Publication year - 2005
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.1551-2916.2005.00467.x
Subject(s) - dispersant , aqueous solution , citric acid , polyacrylic acid , slurry , hydrolysis , materials science , chemical engineering , particle size , chemistry , composite material , organic chemistry , dispersion (optics) , polymer , physics , optics , engineering
The impact of different additives on the hydrolysis of AlN powder in aqueous suspensions at room temperature was studied. The results show that citric acid and polyacrylic acid are most effective in chemically protecting AlN against hydrolysis. The protected powder is hydrophilic, which facilitates aqueous processing, and the chemical stability is retained when basic dispersing agents are added. Based on these results, the solid loading of the aqueous slurries was maximized by utilizing bimodal particle size distributions. Combining bimodal powders with the dispersants Dolapix and citric acid, colloidally stable slurries with solid loadings in excess of 50 vol% were obtained.