Influence of Mg2+ ions adsorption onto alumina particle surface by polyacrylic acid on sintering properties in alumina compacts

Abstract

Influence of Mg2+ ions adsorption onto alumina particle surface by polyacrylic acid (PAA) in alumina slurry on sintering properties in alumina compacts was investigated. The adsorbed amount of Mg2+ ions was dominated by the adsorbed amount of PAA. The adsorbed amount of Mg2+ ions attained the maximum value at a [Mg2+]/[PAA monomer] ratio of 0.25. The optimum amount of PAA in well-dispersed alumina slurry led to almost 100 percent of Mg2+ ions adsorption onto alumina particle surface and to high relative density and homogeneous microstructure in the sintered body.