The Effects of Process Conditions on Improvement of the Compressive Strengths of Reticulated Porous Zirconia

Sujin Lee,Se-Hun Kwon,Chae-Young Lee,In-Hyuck Song,Jongman Lee,Jang-Hoon Ha

doi:10.3390/app12031591

Sujin Lee, Se-Hun Kwon + Show 4 more

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https://doi.org/10.3390/app12031591

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Abstract

In recent years, there has been growing interest in porous ceramics in many research areas given their superior thermal and chemical resistance capabilities, unlike porous metals and porous polymers. Among the various types of porous ceramics, reticulated porous ceramics can offer significant industrial potential due to the low density and high permeability of these materials. However, industrial applications are somewhat rare owing to the rather low compressive strength of reticulated porous ceramics compared to other types of porous ceramics. Although there have been many studies related to reticulated porous ceramics, few have focused on reticulated porous zirconia. Therefore, the aim of this study is to determine how to obtain a high compressive strength in reticulated porous zirconia by optimizing the process conditions of the solid loading level and the particle size and by using additives in a zirconia slurry sample. Furthermore, the authors assess the effects on the microstructure and compressive strength of multiple slurry coating, specifically from one to three. In conclusion, the effect of varying these various process conditions on the resulting improvement in compression strength was investigated, and the compression strength of reticulated porous zirconia was significantly increased from 0.14 to 9.43 MPa. The characteristics investigated include the pore characteristics (pore density, pore size and pore structure), the sintering behavior (linear shrinkage), the mechanical properties (compressive strength), and the dielectric properties (dielectric breakdown strength).

Highlights

Research on porous ceramics, which possess excellent thermal and chemical resistance as a substitute material for porous metals and porous polymers in harsh environments, has drawn much attention [1,2,3]
The aim of this paper is to investigate the effects on the compressive strength of reticulated porous zirconia using diverse process conditions
It can be concluded that when the viscosity of zirconia slurry increases beyond a certain range, it becomes a factor for reducing the compressive strength

Summary

Introduction

Research on porous ceramics, which possess excellent thermal and chemical resistance as a substitute material for porous metals and porous polymers in harsh environments, has drawn much attention [1,2,3]. There are many ways to manufacture porous ceramics, such as partial sintering [4], the replica method [5], using a sacrificial template [6], and direct foaming [7]. Reticulated porous ceramic materials are commonly applied in heat exchangers [8], for porous media combustion [9], and as a catalyst support [10] owing to their high permeability and superior resistance to different thermal and chemical conditions. Many researchers have sought to expand the applications of these materials, such as to advanced separation/filtration and dielectric materials that utilize reticulated porous ceramics

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