The composition of the surface and the behavior in aqueous suspensions of three silicon nitride powders were investigated using electron spectroscopy for chemical analysis (ESCA), potentiometric titrations, leaching experiments, and electrophoretic mobility. ESCA shows that the as‐received powders have a surface‐layer composition similar to that identified as an intermediate state between silica and silicon oxynitride. The original differences in pH iep between the three powders disappears by aging the powders. The common pH iep of 6.8 ± 0.3 for the three powders is interpreted as the equilibrium pH iep for silicon nitride in aqueous suspensions.
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Bergström et al. (1989) studied this question.
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