Fabrication of HAp-Coated Micro-Channelled t-ZrO2 Bodies by the Multi-Pass Extrusion Process
HAp-coated micro-channelled t-ZrO2 bodies were fabricated using a multi-pass extrusion process in which carbon powders were used to facilitate the formation of pores and ethylene vinyl acetate was used as a binder. The unidirectional pores and HAp coating layers can be obtained easily, using the extrusion process. The micro-channelled bodies were 180 m in diameter, and the HAp layer was uniformly coated on the pore walls. However, after being sintered above 1200°C, the HAp decomposed and was transformed into -TCP, in which a large number of pores were observed. The maximum values of bending strength of HAp-coated and uncoated porous t-ZrO2 bodies sintered at 1500°C were about 116 and 173 MPa, respectively, and their relative densities were about 57% and 63%, respectively.
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Document Type: Research Article
Affiliations: School of Advanced Materials Engineering, Kongju National University, Chungnam 314-701, South Korea
Publication date: 2006-06-01