Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior

doi:10.1016/j.jeurceramsoc.2017.09.037

IMR OpenIR

	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.
通讯作者	Wang, Jingyang(jywang@imr.ac.cn)
	2018-02-01
发表期刊	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN	0955-2219
卷号	38 期号:2 页码:463-467
摘要	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.; 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.
部门归属	[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
关键词	Silicon-carbide Ceramics Fabrication Microstructure Densification Scattering Strength Powders
学科领域	Materials Science, Ceramics
资助者	National Key R & D Program of China [2017YFB0703201]; Natural Science Foundation of China [5137225, 51772302]
DOI	10.1016/j.jeurceramsoc.2017.09.037
收录类别	SCI
语种	英语
资助项目	National Key R & D Program of China[2017YFB0703201] ; Natural Science Foundation of China[5137225] ; Natural Science Foundation of China[51772302]
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:000418211000009
出版者	ELSEVIER SCI LTD
引用统计	被引频次：62[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79557
专题	中国科学院金属研究所
通讯作者	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.
推荐引用方式 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.