Microstructural comparison of porous oxide ceramics from the system Al2O3–ZrO2 prepared with starch as a pore-forming agent

Živcová, Z. Vlčková; Ločs, Jānis; Keuper, Melanie; Sedlářová, Ivona; Chmelíčková, Michaela

doi:10.1016/j.jeurceramsoc.2012.02.005

Cited by 31 publications

(7 citation statements)

References 34 publications

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“…Moreover, the adsorption, diffusion, and physical entrapment of proteins into the pores are expected to further enhance cell attachment and growth, and as a consequence, the biocompatibility of the material [ 29 ]. Various methods have been reported to develop a gradient pore structure in ceramics, such as the incorporation of pore-forming agents [ 30 , 31 , 32 ], gel- or freeze-casting [ 33 ], and electron deposition [ 20 ], among others. Recently, the SPS sintering method was successfully employed to develop porous materials [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Functionally Graded Al2O3–CTZ Ceramics Fabricated by Spark Plasma Sintering

et al. 2022

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We studied the fabrication of functionally graded Al2O3–CeO2-stabilized-ZrO2 (CTZ) ceramics by spark plasma sintering. The ceramic composite exhibits a gradual change in terms of composition and porosity in the axial direction. The composition gradient was created by layering starting powders with different Al2O3 to CTZ ratios, whereas the porosity gradient was established with a large temperature difference, which was induced by an asymmetric graphite tool configuration during sintering. SEM investigations confirmed the development of a porosity gradient from the top toward the bottom side of the Al2O3–CTZ ceramic and the relative pore volume distributed in a wide range from 0.02 to 100 µm for the samples sintered in asymmetric configuration (ASY), while for the reference samples (STD), the size of pores was limited in the nanometer scale. The microhardness test exhibited a gradual change along the axis of the ASY samples, reaching 10 GPa difference between the two opposite sides of the Al2O3–CTZ ceramics without any sign of delamination or cracks between the layers. The flexural strength of the samples for both series showed an increasing tendency with higher sintering temperatures. However, the ASY samples achieved higher strength due to their lower total porosity and the newly formed elongated CeAl11O18 particles.

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Section: Introductionmentioning

confidence: 99%

Functionally Graded Al2O3–CTZ Ceramics Fabricated by Spark Plasma Sintering

et al. 2022

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“…Several manufacturing methods have been elaborated to produce porous structures including gel-casting process [ 6 ], organic foam technique, freeze casting [ 7 , 8 ], pore-forming agent method [ 9 , 10 ], or partial sintering by spark plasma sintering (SPS), employing appropriate sintering conditions, e.g., uniaxial pressure or graphite tool configuration [ 11 ]. Generally, each has its own merits and limitations.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

et al. 2022

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This paper investigated a synthesis process for highly porous Al2O3, Y-ZTA, and Ce-ZTA ceramic nanocomposites with gradient microstructure and improved mechanical properties. Ceramic nanofibres were synthesized as the starting material. The gradient microstructure was developed during spark plasma sintering using an asymmetric graphite arrangement that generated significant temperature differences (80–100 °C) between the opposite sides of the samples. Structural and mechanical properties of the fibrous ceramic composites were investigated. The effect of the temperature gradient on properties was also discussed. While the asymmetric configuration resulted in a gradient porosity, reference samples fabricated in standard graphite configuration were uniformly porous. The gradient structure and the ZrO2 addition led to improved hardness and compression strength of the sintered samples. However, the opposite sides of the samples exhibited considerable variations in both microstructure and in terms of properties. The upper part of the Ce-ZTA ceramic showed a highly porous structure with 18.2 GPa hardness, while the opposite side was highly densified with 23.0 GPa hardness. Compressive strength was 46.1 MPa and 52.1 MPa for Y-ZTA and Ce-ZTA sintered at 1300 °C, respectively, despite their high porosity. The research provided a promising approach to prepare highly porous ZTA composites with high strength for a wide range of applications.

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“…The common methods for establishing ceramic coatings with rough structure include electrochemical deposition, micro-arc oxidation, dipping method, and pore-forming method. [16][17][18][19][20][21] Among them, the pore-making method is simple, and the ceramic coating itself has the characteristics of porosity. 16 Especially for phosphate-cured ceramic coatings, curing and pore making can be performed simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effect of pore content and pH on the corrosion behavior of hydrophobic ceramic coatings

Wang

et al. 2022

Int J Applied Ceramic Tech

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In this paper, superhydrophobic ceramic coatings were successfully prepared on stainless steel substrates (S304) by sol-gel method, and the effects of pore content and pH conditions on the corrosion resistance of hydrophobic ceramic coatings were studied. As the porosity increases, the contact angle of the coating increases. Among them, the contact angles of the coatings with 15% and 20% porosity in different pH solutions are all greater than 150 • , achieving superhydrophobic surfaces. The contact angle results before and after corrosion show that the solution with a higher pH has a greater damage to the hydrophobicity of the coating. The corrosion resistance of the coatings was evaluated comparatively from polarization curves and electrochemical impedance spectroscopy. As the hydrophobicity improves, the corrosion resistance of the hydrophobic ceramic coating is enhanced. The impedance moduli at .01 Hz of the coating are 1.04 × 10 3 times (pH 4), .13 × 10 3 times (pH 7), and .74 × 10 3 times (pH 10) of the bare steel, respectively. With the increase of pH, the corrosion resistance of hydrophobic ceramic coatings decreases, because OH − in the corrosion solution is more easily adsorbed on the surface of the coating, thereby destroying the long hydrophobic chains.

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Microstructural comparison of porous oxide ceramics from the system Al2O3–ZrO2 prepared with starch as a pore-forming agent

Cited by 31 publications

References 34 publications

Functionally Graded Al2O3–CTZ Ceramics Fabricated by Spark Plasma Sintering

Functionally Graded Al2O3–CTZ Ceramics Fabricated by Spark Plasma Sintering

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

Effect of pore content and pH on the corrosion behavior of hydrophobic ceramic coatings

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