Highly porous nano-SiC with very low thermal conductivity and excellent high temperature behavior
文献类型:期刊论文
作者 | 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. |
刊名 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY |
出版日期 | 2018-02-01 |
卷号 | 38期号:2页码:463-467 |
ISSN号 | 0955-2219 |
关键词 | Silicon-carbide Ceramics Fabrication Microstructure Densification Scattering Strength Powders |
英文摘要 | 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. |
学科主题 | Materials Science, Ceramics |
语种 | 英语 |
资助机构 | National Key R & D Program of China [2017YFB0703201]; Natural Science Foundation of China [5137225, 51772302] |
公开日期 | 2018-06-05 |
源URL | [http://ir.imr.ac.cn/handle/321006/79557] |
专题 | 金属研究所_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. |
入库方式: OAI收割
来源:金属研究所
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