Mechanical behaviors of alumina ceramics doped with rare-earth oxides

Yao, Yijuna; Li, Chuncheng; Wang, Ling; Jiang, Xiaolong; Qiu, Tai

doi:10.1007/s12598-010-0149-5

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…By using rare earth oxides, it is probable to decrease the sintering temperature of ceramics and enhance their microstructures. Rare earth oxides including Sm2O3, La2O3, Dy2O3, Y2O3, CeO2, Er2O3, and Eu2O3 are commonly employed (Shi et al, 2020;Yijun et al, 2010;Ge et al, 2019;Aktas, Tekeli, Kucuktuvek, 2014;Aktas, Tekeli, Salman, 2014). Samarium (III) oxide ( Sm2O3) is a light rare earth element oxide with a melting temperature of over 2000°C, making it a suitable additive for the production of ceramics with enhanced sintering properties (Shi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The addition of rare-earth oxides enhanced the mechanical properties of Al2O3 especially for 0.5 wt% Sm2O3 content by way of grain size refinement and grain boundary strengthening mechanisms (Yijun et al, 2010). There are only a few studies in the literature examining the mechanical properties of Sm2O3 doped Al2O3 ceramics and the studies are mainly related to the creep and mechanical behavior of the eutectic composition (26 % Sm2O3+ 74% Al2O3) (Londaitzbehere et al, 2017;Ma et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…This result is contrary to Wang and Hon’s report [ 8 ], but is in good agreement with the result of Wilson et al [ 9 ]. On the other hand, there are many examples in the literature exploring the static and dynamic hot deformation behaviors of other types of ceramic materials in-depth, such as ZrB 2 [ 10 ], SiC [ 11 ], Al 2 O 3 [ 12 ], and ceramic composite material [ 13 ]. The methods presented in these articles can be applied to the study of SiO 2 -based ceramic core.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Mechanical Behaviors of SiO2-Based Ceramic Core for Directional Solidification of Turbine Blades

Zhong

2020

Materials

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The high-temperature mechanical behaviors of SiO2-based ceramic cores for the directional solidification of turbine hollow blades were investigated. Isothermal uniaxial compression tests of ceramic core samples were conducted on a Gleeble-1500D mechanical simulator with an innovative auxiliary thermal system. The stress–strain results and macro- and micro- structures of SiO2-based ceramic cores were investigated experimentally. The microstructures were characterized by the scanning electron microscope (SEM). Based on the experimental data, a nonlinear constitutive model for high temperature compressive damage was established. The statistical results of Weibull moduli show that the stability of hot deformation increases with the increase of temperature. The fracture type of the SiO2-based core samples is brittle fracture, but when the temperature exceeds 1400 °C, the mechanical behavior exhibits thermo-viscoelastic and viscoplastic property. Under high-temperature (>1400 °C) and stress conditions, the strength of the ceramic core is weakened owing to the viscous slip of SiO2, which is initially melted at the temperature of 1400 °C. The comparison results between the predictions of nonlinear model and experimental values indicate that the model is applicable.

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“…To maintain conductivity of channels under high pressure for a long time, structural failure must be avoided. If the proppant has poor resistance (chemical stability), it is easily crushed under high pressure [ 5 , 15 , 16 ]. After proppants are crushed, they produce fines that can plug the proppant pack and the porosity of the proppant is reduced, which subsequently reduces the permeability of the proppant pack.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pr6O11 Addition on the Acid Resistance of Ceramic Proppant

Xiong

2017

Materials

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This paper investigated the effect of Pr6O11 addition on the acid resistance of ceramic proppant. Acid resistance of proppants can be improved by introducing Pr6O11 into the Al2O3-CaO-MgO-SiO2 (ACMS) system. To illustrate and explain the mechanism of acid resistance, the samples were characterized by different techniques, using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The phase structure of the specimens was characterized by XRD and SEM-detected microstructures of the specimens. It was observed that with the increase of rare-earth oxide content, the acid solubility of the specimens decreased, and then increased when it reached the minimum value 0.45 wt %. The results of the research show that the improvement of acid resistance with rare-earth oxides was achieved by refining the grain size, strengthening the grain boundary, and turning Ca2Al2SiO7, in which acid resistance is poor, into CaAl12O19, which possesses better acid resistance, and then enhance the acid resistance of the proppants. Furthermore, Pr6O11 can form a solid solution with Ca2Al2SiO7 and CaAl12O19. The acid resistance of CaAl12O19 improves with the increase of solid solubility. In contrast, the acid resistance of Ca2Al2SiO7 will decrease after Ca2Al2SiO7 forms a solid solution with Pr6O11.

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Mechanical behaviors of alumina ceramics doped with rare-earth oxides

Cited by 10 publications

References 10 publications

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

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

High-Temperature Mechanical Behaviors of SiO2-Based Ceramic Core for Directional Solidification of Turbine Blades

Effects of Pr6O11 Addition on the Acid Resistance of Ceramic Proppant

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