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Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior
Wan, P; Wang, JY; Wang, JY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, High Performance Ceram Div, Shenyang 110016, Liaoning, Peoples R China.
2018-02-01
Source PublicationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
Volume38Issue:2Pages:463-467
AbstractHighly porous nano-SiC is fabricated by partial sintering and decarburizing process using SiC nano-powders as starting materials and graphite flakes as pore forming agents. The prepared porous nano-SiC ceramics possess multiple pore structures, including well-distributed meso-pores in the skeleton and interconnected flakelike micro-pores. The samples prepared at 1800 degrees C have relatively low thermal conductivities of 5.61 similar to 0.25 W m(-1) K-1 with porosities of 55.5-76.1%. While the samples sintered at 1500 degrees C with porosities between 54.0% to 76.3% show very low thermal conductivities of 0.74 similar to 0.14 W m(-1) K-1, which is attributed to the integrated nano-scale phonon-scattering mechanisms and duplex pore structures. Porous nano-SiC ceramics also show good retention of elastic stiffness up to 1350 degrees C and low thermal conductivity at 1400 degrees C. Our results shed light on porous nano-SiC as a promising thermal insulator used in extreme thermal and chemical environments.; Highly porous nano-SiC is fabricated by partial sintering and decarburizing process using SiC nano-powders as starting materials and graphite flakes as pore forming agents. The prepared porous nano-SiC ceramics possess multiple pore structures, including well-distributed meso-pores in the skeleton and interconnected flakelike micro-pores. The samples prepared at 1800 degrees C have relatively low thermal conductivities of 5.61 similar to 0.25 W m(-1) K-1 with porosities of 55.5-76.1%. While the samples sintered at 1500 degrees C with porosities between 54.0% to 76.3% show very low thermal conductivities of 0.74 similar to 0.14 W m(-1) K-1, which is attributed to the integrated nano-scale phonon-scattering mechanisms and duplex pore structures. Porous nano-SiC ceramics also show good retention of elastic stiffness up to 1350 degrees C and low thermal conductivity at 1400 degrees C. Our results shed light on porous nano-SiC as a promising thermal insulator used in extreme thermal and chemical environments.
description.department[wan, peng ; wang, jingyang] chinese acad sci, inst met res, shenyang natl lab mat sci, high performance ceram div, shenyang 110016, liaoning, peoples r china ; [wan, peng] univ chinese acad sci, beijing 100049, peoples r china
KeywordSilicon-carbide Ceramics Fabrication Microstructure Densification Scattering Strength Powders
Subject AreaMaterials Science, Ceramics
Funding OrganizationNational Key R & D Program of China [2017YFB0703201]; Natural Science Foundation of China [5137225, 51772302]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79557
Collection中国科学院金属研究所
Corresponding AuthorWang, JY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, High Performance Ceram Div, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Wan, P,Wang, JY,Wang, JY . Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2018,38(2):463-467.
APA Wan, P,Wang, JY,&Wang, JY .(2018).Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,38(2),463-467.
MLA Wan, P,et al."Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38.2(2018):463-467.
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