Dispersion Characteristics of AlN-Y2O3Powder Mixture by Various Dispersants in Non-aqueous Solvents

The dispersion characteristics of AlN-4.5 wt% Y 2 O 3 powder mixture by various dispersants were investigated in ethanol and methyethly-ketone (MEK) solvents.In general, the cationic polymer dispersants demonstrated superior dispersion of the powder as compared to the non-ionic ester-type dispersants or anionic phosphate-ester-based ones.The dispersion performance of the cationic polymer dispersants was sensitive to the type of solvent.An anhydric maleic-acid-based graft copolymer dispersant, AFB-1521, demonstrated a very good dispersion capability in ethanol but exhibited a much inferior dispersion in MEK.On the other hand, the dispersion of the powder mixture was very good with a phosphate-ester-based block polymer dispersant, BYK-111, in MEK solvent, while dispersionwas much degraded in ethanol.