Effect of Ultrasonication on the Microstructure and Tensile Elongation of Zirconia-Dispersed Alumina Ceramics Prepared by Colloidal Processing

• Published in: Journal of the American Ceramic Society Vol. 84; no. 9; pp. 2132 - 2134
• Main Authors: Suzuki, Tohru S., Sakka, Yoshio, Nakano, Keishi, Hiraga, Keijiro
• Format: Journal Article
• Language: English
• Published: Westerville, Ohio American Ceramics Society 01.09.2001; Blackwell
• Subjects: alumina; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Exact sciences and technology; microstructure; Miscellaneous; Technical ceramics; zirconia; Ultrasonic treatment; Mechanical properties; Tensile property; Stabilized zirconia; Particle suspension; Experimental study; Fabrication property relation; Oxide ceramics; Dispersion; Composite material; Yttrium Oxides; Colloidal suspension; Fabrication structure relation; Manufacturing; Microstructure; Alumina
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.2001.tb00973.x

To obtain dense, fine‐grained ceramics, fine particles and advanced powder processing, such as colloidal processing, are needed. Al2O3 and ZrO2 particles are dispersed in colloidal suspensions by electrosteric repulsion because of polyelectrolyte absorbed on their surfaces. However, additional redispersion treatment such as ultrasonication is required to obtain dispersed suspensions because fine particles tend to agglomerate. The results demonstrate that ultrasonication is effective in improving particle dispersion in suspensions and producing a homogeneous fine microstructure of sintered materials. Superplastic tensile ductility is improved by ultrasonication in preparing suspensions because of the dense and homogeneous fine microstructure.