Porous Nano-SiC as Thermal Insulator: Wisdom on Balancing Thermal Stability, High Strength and Low Thermal Conductivity

Wan, Peng; Wu, Zhen; Zhang, Hui; Gao, Li-Yin; Wang, Jiemin

doi:10.1080/21663831.2015.1121167

Cited by 40 publications

(13 citation statements)

References 35 publications

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“…On the other hand, it has recently been shown that porous nano-sized SiC materials (around 60% porosity and 35 nm of grain size) possess low thermal conductivity values (2 W•m -1 K -1 ), effect that authors attributed to the existence of a high density of stacking faults and, accordingly, their potential application as thermal insulator was claimed [25]. However, for these kinds of open cell structures radiative and convective heat transfer to their surroundings may be prevailing over conduction [26].…”

Section: Resultsmentioning

confidence: 99%

Highly-porous hierarchical SiC structures obtained by filament printing and partial sintering

Gómez-Gómez

Moyano

Román-Manso

et al. 2019

Journal of the European Ceramic Society

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Three-dimensional (3D) porous silicon carbide (SiC) structures with total porosity in the range of 64-85% are achieved from nanosized SiC powders by filament printing and partial sintering in a spark plasma sintering (SPS) furnace. The effects of the SPS temperature (1500 and 1700° C) and the addition of oxide sintering aids (7 wt. % Y2O3+Al2O3) on the porosity of the scaffolds are quantitatively compared. More specifically, hierarchical porosity consisting in the presence of meso-pores (< 50 nm) in the struts and macro-pores (in the range of 500-700 µm) defined by the patterned structure is demonstrated for the 1500 °C SPS treatment. The strength of the structures is analyzed as a function of the density as well as the cooling profiles once subjected to rapid heating under a direct flame. By this simple method, an adaptable family of robust light 3D SiC structures with hierarchical porosity is accomplished.

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Section: Resultsmentioning

confidence: 99%

Highly-porous hierarchical SiC structures obtained by filament printing and partial sintering

Gómez-Gómez

Moyano

Román-Manso

et al. 2019

Journal of the European Ceramic Society

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“…Porous silicon carbide (SiC) ceramics have attracted attention not only in the academic field but also industrially due to their remarkable characteristics such as low bulk density, high melting point, high oxidation resistance, bio‐inert characteristic, corrosion resistance, high chemical stability, excellent mechanical strength, high specific strength, high thermal shock resistance, tailored thermal conductivity, and controlled permeability 1–15 . These characteristics have made porous SiC ceramics suitable candidates to perform a wide range of engineering applications including membranes for water purification and gas separation, 1,3,5,11,16–19 ceramic carriers, 20 lightweight structural materials, 4,6,7,9 hot gas filters, 10,11,21–25 catalytic supports, 26–28 and thermal insulators 29–35 …”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] These characteristics have made porous SiC ceramics suitable candidates to perform a wide range of engineering applications including membranes for water purification and gas separation, 1,3,5,11,[16][17][18][19] ceramic carriers, 20 lightweight structural materials, 4,6,7,9 hot gas filters, 10,11,[21][22][23][24][25] catalytic supports, [26][27][28] and thermal insulators. [29][30][31][32][33][34][35] For cost-effective processing of porous SiC ceramics, sintering of porous SiC ceramics at lower temperatures is preferred. However, strong covalent bonding nature of SiC requires high sintering temperatures for achieving sufficient necking between SiC particles.…”

Section: Introductionmentioning

confidence: 99%

Effects of SiC whisker addition on mechanical, thermal, and permeability properties of porous silica‐bonded SiC ceramics

Lucio

Kultayeva

Kim

et al. 2021

Int J Applied Ceramic Tech

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The effects of SiC whisker addition into nano‐SiC powder‐carbon black template mixture on flexural strength, thermal conductivity, and specific flow rate of porous silica‐bonded SiC ceramics were investigated. The flexural strength of 1200°C‐sintered porous silica‐bonded SiC ceramics increased from 9.5 MPa to 12.8 MPa with the addition of 33 wt% SiC whisker because the SiC whiskers acted as a reinforcement in porous silica‐bonded SiC ceramics. The thermal conductivity of 1200°C‐sintered porous silica‐bonded SiC ceramics monotonically increased from 0.360 Wm–1K–1 to 1.415 Wm–1K–1 as the SiC whisker content increased from 0 to 100 wt% because of the easy heat conduction path provided by SiC whiskers with a high aspect ratio. The specific flow rate of 1200°C‐sintered porous SiC ceramics increased by two orders of magnitude as the SiC whisker content increased from 0 to 100 wt%. These results were primarily attributed to an increase in pore size from 125 nm to 565 nm and secondarily an increase in porosity from 49.9% to 63.6%. In summary, the addition of 33 wt% SiC whisker increased the flexural strength, thermal conductivity, and specific flow rate of porous silica‐bonded SiC ceramics by 35%, 133%, and 266%, respectively.

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“…Porous SiC‐based ceramics are extensively used in various industrial applications such as the purification process of air and water, bio‐implants, thermoelectric energy conversion devices, catalytic supports, and thermal insulation, owing to their excellent mechanical properties, high corrosion and oxidation resistances, and tunable thermal and electrical properties 1‐7 …”

Section: Introductionmentioning

confidence: 99%

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

2020

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Porous SiC-based ceramics are extensively used in various industrial applications such as the purification process of air and water, bio-implants, thermoelectric energy conversion devices, catalytic supports, and thermal insulation, owing to their excellent mechanical properties, high corrosion and oxidation resistances, and tunable thermal and electrical properties. 1-7 Recently, we reported silica-bonded porous nano-SiC ceramics (hereafter, referred to as porous SiC-SiO 2 composites), which exhibited extremely low thermal conductivities (~0.05 Wm −1 K −1). 8,9 The high thermal insulation performance was attributed to the high interfacial thermal resistance of the SiC-SiO 2 interface. The porous SiC-SiO 2 composites exhibited a β-to-α (3C → 6H) polytypic phase transformation at a temperature as low as 600°C. 8,9 In this study, high-resolution transmission electron microscopy (HRTEM) characterization was performed to (a) reveal the intrinsic microstructure and (b) confirm the low-temperature polytypic transformation in the porous SiC-SiO 2 composites. Moreover, the HRTEM images revealed the precipitation of non-graphitic carbons in a porous SiC-SiO 2 composite sintered at 1200°C. This study reveals the underlying mechanisms for the oxidation-induced low-temperature polytypic phase transformation and non-graphitic carbon precipitation. These findings are crucial for the development of SiC-SiO 2-based thermal insulators and metal oxide semiconductor field-effect transistors (MOSFETs). The polytypic phase boundaries (α-β interface) and non-graphitic carbon-SiC heterophase boundaries act as phonon scattering sites. Thus, the thermal insulation performance of the porous SiC-SiO 2 composites could be improved by controlled polytypic phase transformation and non-graphitic carbon precipitation. Similarly, the electrical characteristics of SiC-SiO 2 MOSFETs could be tuned by a polytypic phase transformation and precipitation of the electrically conductive (~10 5 Ω −1 cm −1) 10 non-graphitic carbon phase. 2 | MATERIALS AND METHODS Nano-β-SiC (~50 nm, 97.5 +%, Nanostructured & Amorphous Materials, Inc) and carbon black (∼70 nm, N774,

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Porous Nano-SiC as Thermal Insulator: Wisdom on Balancing Thermal Stability, High Strength and Low Thermal Conductivity

Cited by 40 publications

References 35 publications

Highly-porous hierarchical SiC structures obtained by filament printing and partial sintering

Highly-porous hierarchical SiC structures obtained by filament printing and partial sintering

Effects of SiC whisker addition on mechanical, thermal, and permeability properties of porous silica‐bonded SiC ceramics

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

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