Low-temperature preparation of porous SiC ceramics using phosphoric acid as a pore-forming agent and a binder

Gu, Tian; Chen, Fei; Shen, Qiang; Zhang, Lianmeng

doi:10.1016/j.ceramint.2019.05.179

Cited by 21 publications

(5 citation statements)

References 23 publications

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“…To fabricate high‐efficiency thermoelectric generators, materials with high temperature stability (>1000 K), high thermal stress durability, and excellent thermal shock resistance are required 43,170 . The use of porous SiC is encouraged owing to its excellent high temperature thermomechanical strength and thermal shock resistance 15,170–172 . It has been reported that a thermoelectric material with low electrical resistivity, low thermal conductivity, and high Seebeck coefficient provides an overall high figure of merit and power factor, which correspond to a high thermoelectric efficiency 43,173–175 .…”

Section: Applications Of Porous Sic With Controlled Electrical Resist...mentioning

confidence: 99%

“…43,170 The use of porous SiC is encouraged owing to its excellent high temperature thermomechanical strength and thermal shock resistance. 15,[170][171][172] It has been reported that a thermoelectric material with low electrical resistivity, low thermal conductivity, and high Seebeck coefficient provides an overall high figure of merit and power factor, which correspond to a high thermoelectric efficiency. 43,[173][174][175] Controlled electrical and thermal conductivities 28,31,33,43 along with the semiconducting nature (both n-and ptype) of porous SiC make it a promising candidate for application in high temperature thermoelectric energy generators.…”

Section: Thermoelectric Conversionmentioning

confidence: 99%

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Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

Anwar

Bukhari

et al. 2022

Int J Applied Ceramic Tech

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Porous silicon carbide (SiC)‐based ceramics are widely used in numerous applications of technical importance owing to their exceptional structural (e.g., excellent chemical, mechanical, and thermal stability) and functional (e.g., controlled electrical resistivity) properties. Porous SiC with controlled electrical resistivity is required for various advanced applications, for example, power electronic devices, semiconductor processing parts, fusion reactors, thermoelectric energy conversion, electromagnetic shielding, and environmental applications such as heatable filters. The electrical properties of sintered porous SiC are significantly affected by its chemical composition, processing conditions, and microstructure. This article reviews the influence of certain critical factors, such as the polytype, doping conditions, porosity (%), additive composition (oxide additives, element additives, metal nitride/carbide additives, etc.), and processing conditions on the electrical resistivity of porous SiC. Novel applications of porous SiC with controlled electrical resistivity are also discussed in this review.

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Section: Applications Of Porous Sic With Controlled Electrical Resist...mentioning

confidence: 99%

Section: Thermoelectric Conversionmentioning

confidence: 99%

Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

Anwar

Bukhari

et al. 2022

Int J Applied Ceramic Tech

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“…In contrast, conventional methods for fabricating SiC porous ceramics, such as replica [ 19 , 20 ], sacrificial template method [ 21 , 22 ], and the foaming method [ 23 ], are simpler and easier to perform. Among them, the foaming method, which was invented by Sundermann in 1973 [ 24 ], has attracted widespread attention due to its simple and straightforward operation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of SiC Porous Ceramics by Foaming Method

et al. 2023

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In this work, hierarchically porous SiC ceramics were prepared via the foaming method. Porous ceramics with tunable, uniform, and bimodal pore structures were successfully fabricated in a facile way. The formation mechanisms of the 1st and 2nd modal macropores are the H2O2 foaming process and SiC particle overlap, respectively. The effect of pore-foaming agent amount, foaming temperature, and surfactant was investigated. According to the results, with increasing H2O2 amount, the porosity, pore size, and interconnectivity of the 1st modal pores increased, whereas bulk density and strength decreased. The porosity increased while the strength decreased as the foaming temperature increased. Surfactants increased pore interconnectivity and porosity. When the foaming temperature was 85 °C, and the addition of H2O2 was 5 wt.%, the porosity, bulk density, flexural strength, and compressive strength were 56.32%, 2.8301 g/cm3, 11.94 MPa, and 24.32 MPa, respectively. Moreover, SiC porous ceramics exhibited excellent corrosion resistance to acids and alkalis.

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“…Porous silicon carbide (SiC) ceramics with low density, large specific surface area, excellent thermal shock and oxidation resistance, as well as high temperature and chemical corrosion resistance, are widely used as filter, thermal insulation, separation membranes, catalyst supports, bio-ceramics and other component materials. 1)3) So far, there are many preparation methods for porous SiC ceramics, including organic foam impregnation, 4) foaming, 5) adding pore-making agent, 6) solid-state sintering, 7) extrusion molding, 8) solgel, 9),10) and gelcasting. 11) The pore size of porous SiC ceramics prepared by organic foam impregnation mainly depends on the structural sizes of the pore and the coating thickness of the slurry.…”

Section: Introductionmentioning

confidence: 99%

“…5) The method of adding pore-making agent can control the pores size, shape and porosity by adding poremaking agents with different shapes, particle sizes and contents. 6) For solid-state sintering, the shape, size and distribution of powder particles, the content and types of various additives, and sintering temperature all have direct influence on the formation, porosity, pore size and distribution of microporous bodies. 7) Extrusion requires accurate design of the shape and size of the pore in the porous metal mold, and it cannot produce porous materials with complex structures and small pore sizes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of hierarchical porous SiC ceramics via gelcasting and carbothermal reduction between carbon and SiO

Cheng

Yang

Zhang

2020

J. Ceram. Soc. Japan

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With phenolic resin as carbon source, ethylene glycol as solvent and pore-forming agent, and silicon monoxide as pore-forming agent and silicon source, a kind of light hierarchical porous silicon carbide (SiC) ceramics with adjustable pores was prepared by gelcasting, carbonization and carbothermal reduction. With the addition of silicon monoxide in the green body from 13 to 49%, the porosities increased from 66 to 89%, the densities and thermal conductivity are as low as 0.36 g•cm ¹3 and 0.29 W•m ¹1 •K ¹1 . The macropores are mainly determined by the addition of silica particle size, which increases from 9.2 to 39.5%, while the micropores and mesopores, ranging from 56.8 to 49.5%, are mainly determined by the pyrolysis of resin carbon source. When the porosity of porous SiC is 75%, the compressive strength of 7.83 MPa can be reached. The prepared porous SiC ceramics possessed light, good thermal insulation and other properties, which can be further improved by changing the shape and size of the added SiO particles. In addition, different from using polycarbosilane as preceramic polymer, the porous SiC ceramics with complex shape and uniform microstructure can be prepared via gelcasting, which will reduce the production costs and broaden its application.

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Low-temperature preparation of porous SiC ceramics using phosphoric acid as a pore-forming agent and a binder

Cited by 21 publications

References 23 publications

Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

Fabrication of SiC Porous Ceramics by Foaming Method

Fabrication and characterization of hierarchical porous SiC ceramics via gelcasting and carbothermal reduction between carbon and SiO

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