Influence of spark plasma sintering conditions on microstructure, carbon contamination, and transmittance of CaF2 ceramics

Wang, Ping; Huang, Zhifeng; Morita, Koji; Li, Qizhong; Yang, Meijun; Song, Zhanqian; Goto, Takashi; Tu, Rong

doi:10.1016/j.jeurceramsoc.2021.10.004

Cited by 24 publications

(2 citation statements)

References 61 publications

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“…It is interesting to note that the carbonized layers were manifested more clearly in the irradiated samples than in the initial ones. Note also that the carbonization of the surface layers in SPS has been observed often for various metallic alloys [26,46,47] and ceramic materials [26,46,[48][49][50][51][52][53][54][55]. Some authors suggest the carbonization of materials in SPS originates from the low-temperature decomposition of the polymer used to bind the graphite foil [54].…”

Section: Resultsmentioning

confidence: 97%

Investigation of the Microstructure of Fine-Grained YPO4:Gd Ceramics with Xenotime Structure after Xe Irradiation

et al. 2022

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This paper reports on the preparation of xenotime-structured ceramics using the Spark Plasma Sintering (SPS) method. Y0.95Gd0.05PO4 (YPO4:Gd) phosphates were obtained using the sol-gel method. The synthesized powders were nanodispersed and were agglomerated (the agglomerates sizes were 10–50 µm). The ceramics had a fine-grained microstructure and a high relative density (98.67 ± 0.18%). The total time of the SPS process was approximately 18 min. The sintered high-density YPO4:Gd ceramics with a xenotime structure were irradiated with 132Xe+26 ions with 167 MeV of energy and fluences in the range of 1 × 1012–3 × 1013 cm−2. Complete amorphization was not achieved even at the maximum fluence. The calculated value of the critical fluence was (9.2 ± 0.1) × 1014 cm−2. According to the results of grazing incidence X-ray diffraction (GIXRD), the volume fraction of the amorphous structure increased from 20 to 70% with increasing fluence from 1 × 1012 up to 3 × 1013 cm−2. The intensity of the 200 YPO4:Gd XRD peak reached ~80% of the initial intensity after recovery annealing (700 °C, 18 h).

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Section: Resultsmentioning

confidence: 97%

Investigation of the Microstructure of Fine-Grained YPO4:Gd Ceramics with Xenotime Structure after Xe Irradiation

et al. 2022

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“…The coarse-grain ceramics have very low resistance against thermal shock, and the samples are often destroyed during cooling down. Additionally, the sintering at high temperatures can lead to partial dissociation of the elements (W, Mo) from the ceramic surfaces and to more intensive saturation of the ceramic sample surfaces with the mold (see [ 50 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]).…”

Section: Methodsmentioning

confidence: 99%

(Na, Zr) and (Ca, Zr) Phosphate-Molybdates and Phosphate-Tungstates: I–Synthesis, Sintering and Characterization

et al. 2023

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Submicron-grade powders of Na1-xZr2(PO4)3-x(XO4)x compounds (hereafter referred to as NZP) and Ca1-xZr2(PO4)3-x(XO4)x compounds (hereafter, CZP), X = Mo, W (0 ≤ x ≤ 0.5) were obtained by sol-gel synthesis. The compounds obtained were studied by X-ray diffraction phase analysis and electron microscopy. An increase in the W or Mo contents was shown to result in an increase in the unit cell volume of the NZP and CZP crystal lattices and in a decrease in the coherent scattering region sizes. Thermal expansion behavior at high temperatures of synthesized NZP and CZP compounds has been investigated. The dependencies of the parameters a and c on the heating temperature, as well as the temperature dependence of the crystal lattice unit cell volume V in the range from the room temperature up to 800 °C, were obtained. The dependencies of the average thermal expansion coefficient (αav) and of the volume coefficient (β) on the W and Mo contents in the compositions of NZP and CZP compounds were studied. Ceramics Na1-xZr2(PO4)3-x(XO4)x with relatively high density (more than 97.5%) were produced by spark plasma sintering (SPS). The increase in the W or Mo contents in the ceramics leads to an increase in the relative density of NZP and to a decrease of the optimum sintering temperature. The mean grain size in the NZP ceramics decreases with increasing W or Mo contents. The study of strength characteristics has revealed that the hardness of the NZP ceramics is greater than 5 GPa, and that the minimum fracture toughness factor was 1 MPa·m1/2.

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Effect of ZrO2 on sintering behavior and properties of h-BN/ZrO2 composites by spark plasma sintering

Zhang

Chen

Wang

et al. 2022

Ceramics International

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Influence of spark plasma sintering conditions on microstructure, carbon contamination, and transmittance of CaF2 ceramics

Cited by 24 publications

References 61 publications

Investigation of the Microstructure of Fine-Grained YPO4:Gd Ceramics with Xenotime Structure after Xe Irradiation

Investigation of the Microstructure of Fine-Grained YPO4:Gd Ceramics with Xenotime Structure after Xe Irradiation

(Na, Zr) and (Ca, Zr) Phosphate-Molybdates and Phosphate-Tungstates: I–Synthesis, Sintering and Characterization

Effect of ZrO2 on sintering behavior and properties of h-BN/ZrO2 composites by spark plasma sintering

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