Fabrication of zirconia- and ceria-based thin-wall tubes by thermoplastic extrusion

• Published in: Journal of the European Ceramic Society Vol. 24; no. 4; pp. 645 - 651
• Main Author: Trunec, M.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.2004; Elsevier
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; CeO 2; Ceramic industries; Chemical industry and chemicals; Electrolyte; Exact sciences and technology; Extrusion; Miscellaneous; Suspensions; Technical ceramics; ZrO 2; CeO 2; ZrO 2; Extrusion; Electrolyte; Suspensions; Scanning electron microscopy; Deformation; Solid electrolyte; Mechanical properties; Tubular shape; Stabilized zirconia; Cerium oxide; Experimental study; Oxide ceramics; Fracture toughness; Lanthanide compound; Gadolinium oxides; Bending strength; Yttrium Oxides; Sintering; Technical ceramics; Zirconium Oxides; Manufacturing; Microstructure; Thermoplasticity; Thin wall; Microphotography; Rheological properties
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(03)00258-9

Thin-wall tubes made of zirconia stabilized by 8 mol% of yttria and of ceria doped by 10 mol% of gadolinia were prepared by thermoplastic extrusion. The rheological behaviour of the ceramic mixtures prepared and the effect of rheological properties on the deformation of tubes were studied. After sintering, the diameter of tubes was 10.5 mm and their wall thickness ranged from 270 to 420 μm. The deformation and shape irregularity of sintered tubes were determined. The tubes, which were sintered at a temperature of 1500 °C, had a relative density of more than 98% t.d. Flexural strength and fracture toughness of sintered ceramics were determined on test bars prepared by injection moulding from thermoplastic mixtures identical to those used for extrusion. The fracture toughness established was 1.7 MPa m 0.5 for yttria-stabilized zirconia, and 1.1 MPa m 0.5 for gadolinia-doped ceria.