Effect of ZrO2 content on the microstructure and flexural strength of Al2O3–ZrO2 composites with the stored failure energy-fragmentation relations

Yıldız, Betül Kafkaslıoğlu; Tür, Yahya Kemal

doi:10.1016/j.ceramint.2021.08.329

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…The study focused on peak current, wire feed-rate, pulse off-time, and on-time pulse, revealing that electrical parameters significantly influenced material removal rates [13]. However, machining zirconia-reinforced composite materials poses challenges due to their high hardness, and the machining behavior of ceramic-reinforced composite materials, particularly in the context of WEDM, is not extensively explored [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method

Bharathiraja

et al. 2024

Mater. Res. Express

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This study focuses on the optimization of wire-cut electric discharge machining (WEDM) process for hybrid metal matrix nanocomposites. AA6061 alloy reinforced with graphene (C) and zirconia (ZrO2) was fabricated through the stir casting method with ultrasonic assistance for three different weight proportions: 92 % AA6061 / 3% C / 5% ZrO2, 87% AA6061 / 3% C / 10% ZrO2, and 82% AA6061 / 3% C / 15% ZrO2. Microstructural examination confirmed the uniform distribution of reinforcements in the matrix alloy. The fabricated composite was machined by WEDM using an L27 orthogonal array designed by Taguchi’s method. Four electrical control factors of pulse on-time, pulse off-time, wire feedrate and peak current were considered, along with one reinforcement factor and three output responses: kerf width, surface finish and material removal rate to analyse the machining behaviour. Analysis of Variance was performed to determine the significant parameters. The results revealed that the most significant factor is pulse on-time among the five different factors. Optimized parameters were identified and examined through confirmation experiments resulting in improved machining characteristics.

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Section: Introductionmentioning

confidence: 99%

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method

Bharathiraja

et al. 2024

Mater. Res. Express

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“…Nevertheless, the fracture toughness and flexural strength of Al2O3 ceramics are low among the most commonly used technical ceramics like Si3N4 and SiC (Hazell, 2016;Dresch et al, 2021;Flinders et al, 2005). This can be seen as a disadvantage when it comes to the use of these materials in critical applications (Huang and Chen, 2016;Kafkaslıoğlu Yıldız and Tür, 2021). The additives are greatly significant for the achievement of the sintering and, hence, for the enhancement of the mechanical properties (Lartigue-Korinek et al, 2002;Shi et al, 2020;Harun et al, 2012;Aktas et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Exploring Microstructure and Bending Strength of Al2O3 Ceramics Doped with Sm2O3 Rare-Earth Oxide: Impact of Volume Ratios and Sintering Temperatures

TAŞDEMİR,

KAFKASLIOĞLU YILDIZ,

IŞIK

et al. 2023

Karadeniz Fen Bilimleri Dergisi

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The effects of low amounts (0, 0.1, 0.3, 0.5, 0.8, 1, 2vol%) of Sm2O3 on the densification, microstructure, and bending strength of Al2O3 were studied for different sintering temperatures. Sm2O3 and Al2O3 powders were mixed by ball milling, and Al2O3-Sm2O3 ceramics were prepared by dry and cold isostatic pressing in disc form before pressureless sintering at 1550°C and 1600°C/2 h in the air, separately. Sm2O3 reacted with Al2O3 by forming SmAlO3. The rod-like morphology of the SmAlO3 was generally achieved for 0.8 and 1vol% Sm2O3 for sintering at 1600°C, whereas the rod-like form was more obvious for the samples sintered at 1550°C. Similar relative densities were attained for all Sm2O3 ratios at both sintering temperatures, but the Al2O3 sintered at 1550°C exhibited higher densification than the Al2O3 sintered at 1600°C. The strength values were close, while a strength increase of about 5% was obtained for 0.5 vol% Sm2O3 containing ceramics sintered at 1600°C caused by the higher densification compared to the Al2O3. The strength showed a prominent drop above the ratio of 0.1 vol% Sm2O3 for sintering at 1550°C. The addition of present amounts of Sm2O3 did not have a significant effect on the mechanical properties of Al2O3 but it changed the microstructure.

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“…In addition, the dielectric properties, which are more significant for Al2O3, make these ceramics suitable for use as substrates in integrated circuits and insulators. Composite ceramic materials based on alumina and zirconia, containing hexaaluminates, are employed in the manufacturing of cutting tools, joint replacement implants, and other structural products [1][2][3][4][5][6]. Hexaaluminates have positive effect on the fracture toughness of alumina-zirconia composites [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Cherkasova,

Antropova,

Kuzmin

et al. 2023

Chim.Tech.Acta

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Alumina-zirconia composites containing calcium hexaaluminate in the amount from 0 to 15 wt.% were investigated. The materials were obtained by water dispersion, granulation, axial pressing, and free sintering. Density and open porosity were determined by the hydrostatic weighing method. Phase analysis was performed using synchrotron radiation. Structural investigations were conducted using scanning and transmission electron microscopy. Vickers hardness was determined at a load of 10 kg. Fracture toughness was determined by the indentation method. With increasing CaAl12O19 content in the composites, the relative density decreased from 98.5% to 91.8%, and the open porosity increased from 0.2 to 1.4%. The lattice parameters of t-ZrO2 crystal lattice did not change up to 12 wt.% CaAl12O19, and the degree of tetragonality was 1.435. The degree of tetragonality decreased for the material with 15 wt.% CaAl12O19 and reached 1.420. The lattice parameters of CaAl12O19 decreased with increasing content. Platelet size increased with increasing calcium hexaaluminate content. For the materials containing up to 9 wt.% CaAl12O19, the average length of the platelets was 2 μm, the width was 0.4 μm, and the aspect ratio was 5. For the material with maximum calcium hexaaluminate content, the average length of the platelets was 4.2 μm, the width was 0.6 μm, and the aspect ratio was 7. With increasing CaAl12O19 content, the hardness decreased from 1700±25 to 1390±30 Hv, and the critical stress intensity factor increased by 34% to 6.7±0.3 MPa·m1/2.

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Effect of ZrO2 content on the microstructure and flexural strength of Al2O3–ZrO2 composites with the stored failure energy-fragmentation relations

Cited by 11 publications

References 19 publications

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method

Exploring Microstructure and Bending Strength of Al2O3 Ceramics Doped with Sm2O3 Rare-Earth Oxide: Impact of Volume Ratios and Sintering Temperatures

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

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Effect of ZrO2 content on the microstructure and flexural strength of Al2O3–ZrO2 composites with the stored failure energy-fragmentation relations

Cited by 11 publications

References 19 publications

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO2 hybrid nano composites using Taguchi’s method

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO2 hybrid nano composites using Taguchi’s method

Exploring Microstructure and Bending Strength of Al2O3 Ceramics Doped with Sm2O3 Rare-Earth Oxide: Impact of Volume Ratios and Sintering Temperatures

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

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Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method

Analysis of wire-cut electric discharge machining behaviour of AA6061 / C / ZrO₂ hybrid nano composites using Taguchi’s method