Densification and grain growth behavior of highly dense MgO ceramics in pressureless sintering

Li, Shengli; Song, Caixia; Qin, Xiaoying; Zhang, Zhi

doi:10.1016/j.ceramint.2015.04.115

Cited by 19 publications

(4 citation statements)

References 15 publications

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“…10 . Since MgO does not react with Ta-LLZO and has a high melting point of 2852 °C and sintering temperature of 1500 °C [52] , it is considered to be inert and have low activity at 1150 °C, the Ta-LLZO sintering temperature. The MgO distributes uniformly on the Ta-LLZO grains at the initial and intermediate sintering stages.…”

Section: The Role Of Mgomentioning

confidence: 99%

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Huang

Song

et al. 2019

Journal of Energy Chemistry

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Section: The Role Of Mgomentioning

confidence: 99%

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Huang

Song

et al. 2019

Journal of Energy Chemistry

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“…High‐entropy ceramics generally have five or more principal cations and one anion. In recent years, studies on the synthesis of high‐entropy carbide powders, 8–10 densification process, 11 control of microstructures, 12,13 thermal conductivity, 14 and electrical conductivity 15 have achieved significant progress. Zhou et al.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐high strength medium‐entropy (Ti,Zr,Ta)C ceramics at 1800°C by consolidating a core‐shell structured powder

Yang

Wang

et al. 2021

J Am Ceram Soc.

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We report for the first time the synthesis of a core-shell structured composite powder with a core of Zr(Ti,Ta)C and a shell of Ti,Ta(Zr)C at 1700 • C and investigate the formation mechanism for the core-shell structure. The medium-entropy (Ti,Zr,Ta)C ceramics with fine grains (1.1 ± 0.4 μm) and relative density of 94.8% was prepared by hot-pressing at 2100 • C. The flexural strength of (Ti,Zr,Ta)C at 1000 • C (493 ± 21 MPa) was close to the room temperature (511 ± 52 MPa).As the temperature increased from 1600 • C to 1800 • C, the flexural strength was increased significantly, with an ultra-high flexural strength of 725 ± 32 MPa at 1800 • C. The existence of the core-shell structure in the powder suppressed the grain growth due to the sluggish diffusion effect. The ultra-high strength of (Ti,Zr,Ta)C ceramics was attributed to its fine microstructures, high fracture toughness, and the reinforced the grain boundary strength.

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“…The average size of grain (D) was calculated by the linear intercept method in SEM images. [16][17][18] This method depends on drawing a random straight lines through the micrograph photo consisting of the image of the grain segmentation. The number of boundaries among the grains intersecting the lines are calculated.…”

Section: Characterizationmentioning

confidence: 99%

Photothermal Study of ZnO Nanoparticle-Bi₂O₃-Mn₂O₃ Ceramics Doped with Different Compositions from Al₂O₃ at Various Sintering Temperatures

Sendi

2021

ECS J. Solid State Sci. Technol.

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In this work, the optical absorption behavior of ZnO nanoparticle–Bi2O3–Mn2O3 doped with different compositions of Al2O3 at various sintering temperatures was investigated using photopyroelectric spectroscopy (PPE). Different Al2O3 concentration and sintering temperatures affect significantly the varistor characteristics, predominantly promoting ZnO growth at a lower amount of Al2O3. However, the addition of larger amounts of Al2O3 inhibits the grain growth by the increasing amount of spinel phase. The large surface properties of the nanoparticles enhanced the surface interactions even at minimal sintering temperatures. The density is increased depending on increasing the Al2O3 amounts and sintering temperature. X-ray diffraction measurements provided that Al2O3 additive to ceramics leads to construction of the pyrochlore and spinel phase during the sintering process at various temperatures. The energy band gap (Eg) of nanoparticle powder added with 0.0 mol% to 3.0 mol% Al2O3 and sintered through different temperature is obtained by PPE. Optical energy band gap (Eg) was constant at approximately 2.51 eV for 950 °C sintering temperature during all dopant compositions. The energy of band gap reduces in varistors doped with 0.5 mol% Al2O3 doping amount and sintered at 1050 and 1200 °C temperatures. With further increase in Al2O3 up to 1.0 mol%, the value of Eg was 2.15 and 2.21 eV for 1200 °C and 1050 °C, respectively. The superior nonlinearity value (α) is approximately 58 for 950 °C sintered temperature at various adding concentrations. However, at higher sintering temperatures, α value decreases with of the increase in Al2O3 doping concentrations; the value becomes constant beyond 1.0 mol%. The slope of exponential optical absorption is distinguished by steepness factors “σ A” and “σ B,” which are investigated to determine the difference in the energy band gap.

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Densification and grain growth behavior of highly dense MgO ceramics in pressureless sintering

Cited by 19 publications

References 15 publications

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Ultra‐high strength medium‐entropy (Ti,Zr,Ta)C ceramics at 1800°C by consolidating a core‐shell structured powder

Photothermal Study of ZnO Nanoparticle-Bi₂O₃-Mn₂O₃ Ceramics Doped with Different Compositions from Al₂O₃ at Various Sintering Temperatures

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Densification and grain growth behavior of highly dense MgO ceramics in pressureless sintering

Cited by 19 publications

References 15 publications

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Preparation of dense Ta-LLZO/MgO composite Li-ion solid electrolyte: Sintering, microstructure, performance and the role of MgO

Ultra‐high strength medium‐entropy (Ti,Zr,Ta)C ceramics at 1800°C by consolidating a core‐shell structured powder

Photothermal Study of ZnO Nanoparticle-Bi2O3-Mn2O3 Ceramics Doped with Different Compositions from Al2O3 at Various Sintering Temperatures

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Photothermal Study of ZnO Nanoparticle-Bi₂O₃-Mn₂O₃ Ceramics Doped with Different Compositions from Al₂O₃ at Various Sintering Temperatures