Low Temperature Processing of Porous Silicon Carbide Ceramics by Carbothermal Reduction

엄정혜,; 장두희,; 김영욱,; 송인혁,; 김해두,

doi:10.4191/kcers.2006.43.9.552

Cited by 5 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, we found only Song and his colleagues fabricated porous SiC by employing EMS as the pore forming agent [25-28]. The strategy adopted by Song et al involved the following steps: (1) fabricating preceramic foams by heating a mixture of polysiloxane, carbon source (phenol resin or carbon black), sintering additive (Al 2 O 3 –Y 2 O 3 ), pore forming agents (expandable microspheres, or the mixture of expandable microspheres and polymers) and SiC filler up to 140°C; (2) cross-linking the polysiloxane in the foamed body by heating up to 180°C; (3) transforming the polysiloxane and carbon source into SiOC and carbon respectively by pyrolysis at 1200°C, and (4) heating the pyrolysed product to 1450–1850°C for synthesising SiC through carbothermal reduction reaction of SiOC and carbon, and also for liquid-phase sintering of SiC.…”

Section: Resultsmentioning

confidence: 99%

Preparation of highly porous SiC via ceramic precursor conversion and evaluation of its thermal insulation performance

Wang

Pei

et al. 2020

Advances in Applied Ceramics

View full text Add to dashboard Cite

Porous SiC ceramics were prepared based on precursor conversion method using liquid hyperbranched polycarbosilane (LHBPCS) as the preceramic polymer and expandable microsphere (EMS) as the pore foaming agent. By optimising the content of free radical initiator, the cross-linking process of LHBPCS is synchronised with the foaming process of EMS. The addition of EMS had no serious effect on the cross-linking reaction mechanism and rate of LHBPCS, and the cross-linking of LHBPCS did not significantly confine the foaming of EMS. After 1000°C pyrolysis, EMS decomposed, but its spherical shape with sizes of 20-30 μm homogeneously embedded in the pyrolysed LHBPCS. As a result, a highly porous SiC foam with density of 0.211 g cm -3 and porosity of 91.2% was obtained and its thermal conductivity at room temperature was as low as 0.05 W (m K) -1 . In addition, with increasing test temperature, its thermal conductivity increased slowly, indicating a good thermal insulation property.

show abstract

Section: Resultsmentioning

confidence: 99%

Preparation of highly porous SiC via ceramic precursor conversion and evaluation of its thermal insulation performance

Wang

Pei

et al. 2020

Advances in Applied Ceramics

View full text Add to dashboard Cite

show abstract

Processing and properties of macroporous silicon carbide ceramics: A review

Eom

Kim

Raju

2013

Journal of Asian Ceramic Societies

336

162

View full text Add to dashboard Cite

Macroporous silicon carbide is widely used in various industrial applications including filtration for gas and water, absorption, catalyst supports, concentrated solar power, thermoelectric conversion, etc. During the past several years, many researchers have found diverse routes to fabricate macroporous SiC with porosity ranging from 9% to 95%. This review presents a detailed discussion on processing techniques such as partial sintering, replica, sacrificial template, direct foaming, and bonding techniques, as well as the mechanical and thermal properties of macroporous SiC ceramics fabricated using these methods. The full potential of these materials can only be achieved when properties are tailored for a specific application, whereas the control over these properties is highly dependent on the processing route. From the collected data, we have found that the porosity ranges from 9% to 91% with flexural strength of 1-205 MPa, compressive strength of 1-600 MPa, fracture toughness of 0.3-4.3 MPa m 1/2 , and thermal conductivity of 2-82 W/(m•K). This review will enlighten future investigations on processing of porous SiC and its usage in various applications.

show abstract

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Eom¹,

Kim²,

Song³

et al. 2008

Journal of the European Ceramic Society

135

View full text Add to dashboard Cite

Low Temperature Processing of Porous Silicon Carbide Ceramics by Carbothermal Reduction

Cited by 5 publications

References 7 publications

Preparation of highly porous SiC via ceramic precursor conversion and evaluation of its thermal insulation performance

Preparation of highly porous SiC via ceramic precursor conversion and evaluation of its thermal insulation performance

Processing and properties of macroporous silicon carbide ceramics: A review

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Contact Info

Product

Resources

About