Microstructure and properties of fine-grained isotropic graphite based on mixed fillers for application in molten salt breeder reactor

Zhu, He; Lian, Pengfei; Song, Jinliang; Zhang, Dongqing; Guo, Quangui

doi:10.1016/j.jnucmat.2018.09.039

Cited by 21 publications

(13 citation statements)

References 36 publications

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“…The results from the intrusion testing at 750°C, 7.9 bar (101 psig), for 12 h (Table 2) are also plotted in Figure 10. Additionally, several other FLiNaK impregnation results from the literature 26,48,47 were also added to the figure. These data are provided for qualitative comparison only because the impregnation conditions were slightly different (i.e., lower temperature and longer time at pressure).…”

Section: Correlation Between Flinak Impregnation and Mercury Intrusionmentioning

confidence: 99%

“…23 Early attempts within the MSRE program to obtain compact graphite bodies by manipulating the grain size and nature of raw materials 15 belong to the second category. Newer reports emerged regarding the fabrication of binderless nanopore isotropic graphite 24,25 and fine-grain 26,27 and ultrafine-grain graphite 28 that use various fillers and dispersion techniques. According to these reports, graphite pore sizes can be manipulated down to submicron values as needed for operation in molten salts.…”

Section: Introductionmentioning

confidence: 99%

“…Other literature values for similar systems (small symbols) are also added. (Published sources: He 2018,26 He 2015,47 Zhang 2016.48) The upper left corner shows the legend for this work's results and the corresponding impregnated FLiNaK volumes.…”

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confidence: 99%

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Progress Report on Graphite-Salt Intrusion Studies

Gallego

Contescu

Keiser

2020

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Section: Correlation Between Flinak Impregnation and Mercury Intrusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Progress Report on Graphite-Salt Intrusion Studies

Gallego

Contescu

Keiser

2020

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“…However, the thermal conductivity of a typical graphite block using pitch binder and coke powders is as low as 70-150 W m K −1 at room temperature [24,25]. To increase the orientation of the carbon crystallite, efforts have been focused on hot pressing at high temperature (1000-3000 °C) and high pressure (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30). The hydrothermal carbonization method is restrictive, limiting the range of graphite block sizes.…”

Section: Introductionmentioning

confidence: 99%

“…Yuan et al [28] fabricated graphite blocks with thermal conductivity of 522 W m −1 K −1 and flexural strength of 7.7 MPa from NG and mesophase pitch with low-temperature hot pressing at 500 °C. In particular, He et al [29] fabricated mixed fillers containing NG and calcined coke to form fine-grained isotropic graphite blocks using a cold isostatic pressing method. The maximum thermal conductivity of the structure increased from 93 to 130 W m −1 K −1 as the NG filler weight ratio increased.…”

Section: Introductionmentioning

confidence: 99%

Graphite block derived from natural graphite with bimodal particle size distribution

et al. 2020

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This paper presents a novel method for the bimodal design of graphite blocks by optimizing the weight ratio of smallsized natural graphite (NG) particles (mean size of 5 μm) and large-sized NG particles (mean size of 500 μm). Graphite blocks were fabricated by subjecting a mixture containing large NG particles and a well-dispersed pitch/small-sized NG mixture (PSM) to pressure-mold heat treatment. The effect of the PSM contents on the structural, thermal, and mechanical properties of the graphite blocks was investigated. A correlation was found between the amount of small-sized NG particles, the micro-pore structure, and the distribution of large-sized NG particles. In particular, the graphite block, with small-sized NG particle content and pitch binder content of 21 wt% and 9 wt%, respectively, achieved maximum thermal conductivity and flexural strength values of 460 W m K −1 and 14 MPa, respectively, after pressure-mold heat treatment (graphitization) at 2600 °C. Our research advances the development of an eco-friendly solvent-free graphite block fabrication method that produces high-performance graphite blocks of varying size faster and more cost-effectively.

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Preparation and characterization of mosaic coke from heavy‐phase coal pitch

Zhu

et al. 2019

Asia-Pacific J Chem Eng

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Mosaic coke is a considerable intermediate material to produce high‐quality special graphite (isotropic graphite and nuclear graphite). The properties of mosaic coke keep a key role on the quality of special graphite. For a detailed investigation on the feasibility of the production of high‐quality mosaic coke with heavy‐phase coal pitch as the raw material, five kinds of heavy‐phase coal pitches with varied basic physical properties were used as the raw materials to produce mosaic coke in this study. Briefly, Fourier‐transform infrared spectroscopy spectrum combined with curve fitting method have been used to determine the aromatic condensation index (Iar) of heavy‐phase coal pitch. The polarizing microscope incorporated with carbon theory, scanning electron microscopy, X‐ray diffraction, and Raman spectrum have been used to characterize the microstructure of mosaic cokes. The micro‐strength of mosaic cokes have been examined by the micro‐strength tester. The results have shown that the heavy‐phase coal pitches with Iar less than 0.91 are the potential raw materials to produce the high‐quality mosaic coke with higher micro‐strength (higher than 79%).

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Microstructure and properties of fine-grained isotropic graphite based on mixed fillers for application in molten salt breeder reactor

Cited by 21 publications

References 36 publications

Progress Report on Graphite-Salt Intrusion Studies

Progress Report on Graphite-Salt Intrusion Studies

Graphite block derived from natural graphite with bimodal particle size distribution

Preparation and characterization of mosaic coke from heavy‐phase coal pitch

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