Modifizierung von Siliciumnitridpulver durch Beschichtung mit den oxidischen Sinteradditiven

Si3N4-powder was coated with the sintering additives Nd2O3/Al2O3 by precipitation of the additives on the powder surface as hydroxides from an aqueous nitrat solution. Electrokinetic studies of the calcinated powder show that the surface charge characteristics of the Si3N4-powder are determined by the oxide additive layer. TEM studies verify the precipitation of nanosized oxide particles on Si3N4. Different silicon nitride powders can be unified with regard to their surface chemistry by this precipitation method.