Abstract
Porous ceramics have attracted researchers due to their high chemical and thermal stability. Among various types of porous ceramics, reticulated porous ceramics have both high porosity and good permeability. These properties of porous ceramics are difficult to replace with porous metals and polymers. ZTA is used in a variety of applications, and a wealth of experimental data has already been collected. However, research reports on reticulated porous zirconia-toughened alumina (ZTA) are insufficient. Therefore, we prepared reticulated porous ZTA via the replica template method. In this study, various processing conditions (average particle size, zirconia content, solid loading, dispersant, and thickener) were adjusted to improve the compressive strength of the reticulated porous ZTA. As a result, the optimized processing conditions for improving the compressive strength of reticulated porous ZTA could be determined.
Highlights
Among the various types of porous materials, porous ceramics offer the intrinsic properties of porous materials, high thermal resistance, and superior chemical stability of ceramics simultaneously
The reticulated porous zirconia-toughened alumina (ZTA) was prepared using the replica template method, and the degree of densification according to the change in the particle size of alumina and the zirconia content (0 to 40 wt. %), as well as the microstructure and compressive strength changes, were investigated
The ZTA slurry viscosities were measured using a rotary viscometer (ViscoQC 300, Anton Paar GmbH, Graz, Austria), and the compressive strengths of the reticulated porous ZTA specimens after processing at a size of 20 mm × 20 mm × 20 mm were measured with a tensile tester (RB302 Microload, R&B, Daejeon, Korea)
Summary
Among the various types of porous materials, porous ceramics offer the intrinsic properties of porous materials (separation/collection and sound-absorbing/hear-shielding), high thermal resistance, and superior chemical stability of ceramics simultaneously. It is known that the mechanical properties of ZTA depend on the properties of the zirconia, as determined by the type and content of the stabilizer, and are determined by the interaction between the sintering temperature, alumina content, and the t-phase content [20,21]. These properties depend on the spatial distribution state of the zirconia particles in the alumina matrix and the size and concentration of the zirconia particles [22]. The reticulated porous ZTA was prepared using the replica template method, and the degree of densification according to the change in the particle size of alumina (coarse and fine) and the zirconia content The reticulated porous ZTA was prepared using the replica template method, and the degree of densification according to the change in the particle size of alumina (coarse and fine) and the zirconia content (0 to 40 wt. %), as well as the microstructure and compressive strength changes, were investigated
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