Cold sintering of NaNO3/MgO heat-storage composite

Liu, Ming; Jin, Quan; Shen, Ping

doi:10.1016/j.ceramint.2020.08.066

Cited by 30 publications

(4 citation statements)

References 34 publications

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“…37,53 In addition to these well-known effects of pressure on densification during CSP, it was stated in the literature that pressure might contribute to densification through creep and plastic deformation for certain materials that are not hard, such as NaCl and LiF, especially in the later stages of CSP and in the absence of water. 54,55 It is also highly possible that due to the low hardness of Na 2 CO 3 (1.3 on the Mohs hardness scale), an applied high uniaxial pressure promoted densification via creep and plastic deformation and re-shaping. Indeed, its high solubility limit in water and low hardness made Na 2 CO 3 an ideal candidate material that could be densified using CSP for an engineering application.…”

Section: Densification By Cold Sintering Of Sdc-30n Nano-compositesmentioning

confidence: 99%

One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process

et al. 2023

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Sm0.2Ce0.8O1.9‐ 30% Na2CO3 (Sm doped ceria (SDC)‐30N) nano‐composite electrolytes were densified in a single step via cold sintering process (CSP). At 200°C and 450 MPa of uniaxial pressure, samples up to 97% of their theoretical density could be obtained. The effect of processing parameters, such as temperature, uniaxial pressure, processing duration, and moisture content, on the densification of the nano‐composite electrolytes was investigated. The thermal, microstructural, and electrical properties of nano‐composites were investigated by differential scanning calorimetry, X‐ray diffractometer, scanning electron microscope, and EIS analysis. SDC crystallite sizes were found to be around 25 nm, barely coarsened after CSP by which the true nano nature of the nano‐composite could be preserved. Because, by conventional processing high density values could not be attained and high processing temperatures in excess of 600°C had to be used, promoting particle coarsening. The highest total electrical conductivity was found to be 2.2 × 10−2 S cm−1 at 600°C, with an activation energy of 0.83 eV for SDC‐30N nano‐composites. The present investigation revealed that the implementation of cold sintering technique resulted in significant enhancements in the densification of nano‐composite electrolytes, thereby rendering them suitable for efficient utilization in SOFC applications, as compared to the conventional production methods.

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Section: Densification By Cold Sintering Of Sdc-30n Nano-compositesmentioning

confidence: 99%

One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process

et al. 2023

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“…Regarding the fabrication methods of the composites of inorganic PCMs and ceramic particles, a cold sintering process (CSP) [18,19] and chemical reaction method [20] have been reported. The CSP could fabricate the composite of inorganic PCM and metal oxide particle with high relative density ~98% for low temperatures compared with conventional sintering methods.…”

Section: Introductionmentioning

confidence: 99%

Novel Sodium Chloride/Aluminum Oxide Powder-Composite Structure with High Shape-Retention Performance for the Encapsulation of a High-Temperature Phase-Change Material

Yamashita,

Fuhai,

Shenghao

et al. 2024

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Inorganic phase-change materials (PCMs) with high melting points have great potential for thermal energy storage systems. Sodium chloride (NaCl) has a high melting point (801 °C) and high latent-heat-storage density (482 kJ/kg). However, it is difficult to encapsulate NaCl using a sintered ceramic shell because of its good wettability against ceramics and high volume-expansion capacity during melting. In this study, a novel NaCl/Al2O3 powder-composite structure was developed as highly stable PCM core material for highly stable encapsulation. The shape-retention performance and the mechanism of NaCl/Al2O3 powder-composite structure during melting were investigated. We have successfully fabricated a NaCl/Al2O3 powder-composite structure, which has a higher NaCl volume ratio of 80 vol% than conventional techniques. The gel-like network structure of Al2O3 particles in molten NaCl was a key structure to keep the shape of the composite ball and to prevent the evaporation of molten NaCl.

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“…Provided there is one phase that is the major volume fraction in the composite (the matrix) that can undergo sintering, other phases (the filler) can be integrated into the body and from the composite. [9][10][11][12][13][14] A range of works have demonstrated that novel phases and materials, such as polymers (thermoplastics and thermosets), [15][16][17][18][19][20] 2D materials, 21,22 and buckminsterfullerene, 23 can all be readily incorporated into the grain boundaries of a sintered ceramic material. Previously, a number of examples have been made of the cold sintering of low-loss dielectrics with other fillers.…”

Section: Introductionmentioning

confidence: 99%

“…With cold sintering, the low temperatures and fast kinetics circumvent these problems, and allow densification to take place with the mixing of many new types of material systems. Provided there is one phase that is the major volume fraction in the composite (the matrix) that can undergo sintering, other phases (the filler) can be integrated into the body and from the composite 9–14 …”

Section: Introductionmentioning

confidence: 99%

Sodium molybdate‐hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates

et al. 2023

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To fulfill the demands of more bandwidth in 5G and 6G communication technology, new dielectric substrates that can be co-fired into packages and devices that have low dielectric loss and improved thermal conductivity are desired. The motivation for this study is to design composites with low dielectric loss (tan δ) and high thermal conductivity (κ), while still limiting the electrical conductivity, for microwave applications involving high power and high frequency. This work describes the fabrication of high-density electroceramic composites with a model dielectric material for cold sintering, namely sodium molybdate (Na 2 Mo 2 O 7 ), and fillers with higher thermal conductivity such as hexagonal boron nitride. The physical properties of the composites were characterized as a function of filler vol.%, temperature, and frequency. Understanding the variation in measured properties is achieved through analyzing the respective transport mechanisms.

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Cold sintering of NaNO3/MgO heat-storage composite

Cited by 30 publications

References 34 publications

One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process

One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process

Novel Sodium Chloride/Aluminum Oxide Powder-Composite Structure with High Shape-Retention Performance for the Encapsulation of a High-Temperature Phase-Change Material

Sodium molybdate‐hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates

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Cold sintering of NaNO3/MgO heat-storage composite

Cited by 30 publications

References 34 publications

One step densification of SDC—Na2CO3 nano‐composite electrolytes for SOFC applications by cold sintering process

One step densification of SDC—Na2CO3 nano‐composite electrolytes for SOFC applications by cold sintering process

Novel Sodium Chloride/Aluminum Oxide Powder-Composite Structure with High Shape-Retention Performance for the Encapsulation of a High-Temperature Phase-Change Material

Sodium molybdate‐hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates

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One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process

One step densification of SDC—Na₂CO₃ nano‐composite electrolytes for SOFC applications by cold sintering process