Abstract
Reticulated porous ceramics have attracted researchers owing to the separation and collection properties of porous materials and the combined high thermal resistance and chemical stability of ceramics. Among various kinds of reticulated porous ceramics, we investigated the feasibility of using reticulated porous Zirconia-toughened Alumina as applications such as dielectric barriers, insulators, and filters with acceptable properties. An acceptable range of the compressive strength for reticulated porous ZTA applications is approximately 1 MPa. However, when the pore density of the reticulated porous ZTA specimen prepared using coarse zirconia was 60, maximum compressive strength of 1.63 MPa was obtained. To enhance the compressive strength of reticulated porous ZTA specimens, rheological control of the ZTA slurry is most important by optimizing the viscosity of the ZTA slurry, and the composition (average particle size, solid loading, organic binder, and thickener) of the ZTA slurry was controlled. The optimized processing conditions to enhance the compressive strength of reticulated porous ZTA specimens were determined. Consequently, we enhanced the compressive strength of the reticulated porous ZTA specimens from 0.37 MPa to 3.11 MPa by optimizing the ZTA slurry when the solid loading content, the pore density, the sintering temperature, the amount of PVA, and the amount of thickener were 66 wt.%, 60 PPI, 1600 °C, 2 wt.%, and 0.15 wt.%, respectively.
Highlights
Porous ceramics have certain unique properties of porous materials, such as collection/separation of open pores and heat-shielding/sound-absorbing of closed pores
Among the various types of porous ceramics, reticulated porous ceramics have high porosity (≥90%) and permeability simultaneously [1]. These materials are characterized by a 3D network structure with applications to radar-absorbing materials [2], diesel particulate filters (DPF) [3], solid oxide fuel cell (SOFC) electrodes [4], catalyst carriers [5], and molten metal filtration filters [6]
The replica template method can be used to prepare reticulated porous ceramics. This method utilizes a sacrificial polymer template that is impregnated with a ceramic slurry, with the sacrificial polymer template removed through a heat treatment process [15,16]
Summary
Porous ceramics have certain unique properties of porous materials, such as collection/separation of open pores and heat-shielding/sound-absorbing of closed pores. Among the various types of porous ceramics, reticulated porous ceramics have high porosity (≥90%) and permeability simultaneously [1] These materials are characterized by a 3D network structure with applications to radar-absorbing materials [2], diesel particulate filters (DPF) [3], solid oxide fuel cell (SOFC) electrodes [4], catalyst carriers [5], and molten metal filtration filters [6]. There are various porous ceramic fabrication methods, including the replica template method [7,8], the direct foaming method [9,10], the partial sintering method [11,12], and the sacrificial template method [13,14] Among these methods, the replica template method can be used to prepare reticulated porous ceramics. When preparing reticulated porous ceramics using the replica template method, the process parameters include (1) the viscosity of the ceramic slurry and (2) the pore density (PPI) of the sacrificial polymer template
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
