Article(id=1322942832301977944, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1322942780003201932, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20200983, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1609257600000, receivedDateStr=2020-12-30, revisedDate=1614787200000, revisedDateStr=2021-03-04, acceptedDate=null, acceptedDateStr=null, onlineDate=1793343750309, onlineDateStr=2026-10-30, pubDate=1632067200000, pubDateStr=2021-09-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793343750309, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793343750309, creator=13701087609, updateTime=1793343750309, updator=13701087609, issue=Issue{id=1322942780003201932, tenantId=1146029695717560320, journalId=1263187385517883426, year='2021', volume='49', issue='9', pageStart='1785', pageEnd='2044', issueExtLink='null', onlineDate='null', pubDate='1632067200000', pubDateStr='2021-09-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793343737841, creator='13701087609', updateTime=1793345873558, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322951737916665918, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1322942780003201932, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322951737916665919, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1322942780003201932, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1916, endPage=1927, ext={EN=ArticleExt(id=1322942832503304537, articleId=1322942832301977944, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Microstructure and Wave Absorption Properties of SiCnf-Cf/Si3N4 Composites, columnId=1319726165087077079, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Article, runingTitle=null, highlight=null, articleAbstract=

To improve the microwave absorption properties of high-temperature resistance of Si3N4 based composites, four kinds of composites of Si3N4, Cf/Si3N4, SiCnf/Si3N4 and SiCnf-Cf/Si3N4 were prepared by a gel-casting and pressure less sintering process using Si3N4 ceramic as a substrate, and carbon fiber (Cf), SiC nanofibers (SiCnf) or SiC nanofibers coated carbon fiber (SiCnf-Cf), respectively, as an absorber. A comparative study on the microstructure, dielectric properties and microwave absorbing performance at room temperature and 800℃ of as-prepared Si3N4 based composites was conducted. The results show that the high-temperature chemical compatibility of Cf and Si3N4 is effectively improved by coating SiCnf on Cf , and Cf is well preserved in Si3N4 matrix and connected to each other into a conductive network, thus leading to the enhanced electron conduction and multiple relaxation phenomena in SiCn-Cf/Si3N4 composite. The SiCnf-Cf/Si3N4 composite exhibits the maximum dielectric loss value and the optimal microwave absorption performance both at room temperature and 800℃. At room temperature, the minimum reflection loss (RL) of SiCnf-Cf/Si3N4 composite is -15.2 dB at a thickness of 2.57 mm, and the effective absorption bandwidth (RL<-10 dB) is 1.9 GHz at a thickness of 2.30 mm. At 800℃, the minimum RL reaches -20.4 dB at a thickness of 2.0 mm, and the effective absorption bandwidth increases to 3 GHz at a thickness of 2.25 mm. The main absorbing mechanism of SiCnf-Cf/Si3N4 composite is multiple reflections and scattering, electrical conduction loss, electron polarization and multiple relaxations. At 800℃, the polarization and conduction of electrons are enhanced by the accelerated thermal motion of electrons, leading to a further enhancement in the microwave absorption performance. SiCnf-Cf/Si3N4 composite could be used as a high-performance microwave absorbing material for microwave absorption at a high temperature.

, authors=Wei Zhou1, Yuting Zhang1, Jingjing Wang2, Liang Pang2, Yang Li2, authorsList=Wei Zhou, Yuting Zhang, Jingjing Wang, Liang Pang, Yang Li, authorCompany=null, correspAuthors=Yang Li, authorNote=

ZHOU Wei (1986-), male, Ph.D.,Associate Professor.

, correspAuthorsNote=
LI Yang (1987-), male, Ph.D., Associate Professor. E-mail:
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以Si3N4陶瓷为基体,分别添加碳纤维(Cf)、SiC纳米纤维(SiCnf)和SiC纳米纤维包覆碳纤维(SiCnf-Cf)作为吸波剂,采用凝胶注模和无压烧结工艺制备Si3N4、Cf/Si3N4、SiCnf/Si3N4和SiCnf-Cf/Si3N4 4种Si3N4基复合材料,并对其微观结构、室温和800℃的介电性能和吸波性能进行了对比研究。结果表明:SiCnf有效改善了Cf与Si3N4的高温化学相容性,使得Cf在基体中保存完好并相互连接成导电网络,导致SiCnf-Cf/Si3N4复合材料中电子传导增强和存在多重弛豫现象,在室温和800℃高温下均展现出最高的介电损耗值和最优的吸波性能。室温时,SiCnf-Cf/Si3N4复合材料的最小反射损耗值为-15.2 dB(厚度为2.57 mm),有效吸收带宽(反射率<-10 dB)为1.9 GHz(厚度为2.3 mm);800℃时,最小反射损耗值达到-20.4 dB(厚度为2.0 mm),有效吸收带宽增大到3 GHz(厚度为2.25 mm)。SiCnf-Cf/Si3N4复合材料的主要吸波机制为多重反射和散射、电传导损耗、电子极化和多重弛豫;800℃时,电子热运动加剧使电子极化和传导增强,吸波性能进一步提高。进一步优化SiCnf-Cf/Si3N4复合材料的吸波性能,其有望作为优异的吸波材料应用于高温吸波领域。

, authors=周伟1, 张玉婷1, 王晶晶2, 庞亮2, 李杨2, authorsList=周伟, 张玉婷, 王晶晶, 庞亮, 李杨, authorCompany=null, correspAuthors=李杨, authorNote=

周伟(1986—),男,副教授。

, correspAuthorsNote=
李杨(1987—),男,副教授。
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ZHOU Wei (1986-), male, Ph.D.,Associate Professor.

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周伟(1986—),男,副教授。

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SiCnf-Cf/Si3N4复合材料的微观结构与吸波性能
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周伟 1 , 张玉婷 1 , 王晶晶 2 , 庞亮 2 , 李杨 2
硅酸盐学报 | 研究论文 2021,49(9): 1916-1927
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硅酸盐学报 |研究论文 2021 , 49 (9) : 1916 -1927
SiCnf-Cf/Si3N4复合材料的微观结构与吸波性能
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周伟1, 张玉婷1, 王晶晶2, 庞亮2, 李杨2
作者信息
  • 1.湖南工业大学冶金与材料工程学院,湖南 株洲 412007
  • 2.中南大学,粉末冶金国家重点实验室,长沙 410083
通讯作者:
李杨(1987—),男,副教授。
作者简介:

周伟(1986—),男,副教授。

Microstructure and Wave Absorption Properties of SiCnf-Cf/Si3N4 Composites
Wei Zhou1, Yuting Zhang1, Jingjing Wang2, Liang Pang2, Yang Li2
Affiliations
  • 1.College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan China
  • 2.State Key Laboratory of Powder Metallurgy Central South University, Changsha 410083, China
  • Corresponding Author:
    LI Yang (1987-), male, Ph.D., Associate Professor. E-mail:

    ZHOU Wei (1986-), male, Ph.D.,Associate Professor.

出版时间: 2021-09-20 doi: 10.14062/j.issn.0454-5648.20200983
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以Si3N4陶瓷为基体,分别添加碳纤维(Cf)、SiC纳米纤维(SiCnf)和SiC纳米纤维包覆碳纤维(SiCnf-Cf)作为吸波剂,采用凝胶注模和无压烧结工艺制备Si3N4、Cf/Si3N4、SiCnf/Si3N4和SiCnf-Cf/Si3N4 4种Si3N4基复合材料,并对其微观结构、室温和800℃的介电性能和吸波性能进行了对比研究。结果表明:SiCnf有效改善了Cf与Si3N4的高温化学相容性,使得Cf在基体中保存完好并相互连接成导电网络,导致SiCnf-Cf/Si3N4复合材料中电子传导增强和存在多重弛豫现象,在室温和800℃高温下均展现出最高的介电损耗值和最优的吸波性能。室温时,SiCnf-Cf/Si3N4复合材料的最小反射损耗值为-15.2 dB(厚度为2.57 mm),有效吸收带宽(反射率<-10 dB)为1.9 GHz(厚度为2.3 mm);800℃时,最小反射损耗值达到-20.4 dB(厚度为2.0 mm),有效吸收带宽增大到3 GHz(厚度为2.25 mm)。SiCnf-Cf/Si3N4复合材料的主要吸波机制为多重反射和散射、电传导损耗、电子极化和多重弛豫;800℃时,电子热运动加剧使电子极化和传导增强,吸波性能进一步提高。进一步优化SiCnf-Cf/Si3N4复合材料的吸波性能,其有望作为优异的吸波材料应用于高温吸波领域。

氮化硅  /  复合材料  /  耐高温  /  碳纤维  /  碳化硅纳米纤维  /  吸波性能

To improve the microwave absorption properties of high-temperature resistance of Si3N4 based composites, four kinds of composites of Si3N4, Cf/Si3N4, SiCnf/Si3N4 and SiCnf-Cf/Si3N4 were prepared by a gel-casting and pressure less sintering process using Si3N4 ceramic as a substrate, and carbon fiber (Cf), SiC nanofibers (SiCnf) or SiC nanofibers coated carbon fiber (SiCnf-Cf), respectively, as an absorber. A comparative study on the microstructure, dielectric properties and microwave absorbing performance at room temperature and 800℃ of as-prepared Si3N4 based composites was conducted. The results show that the high-temperature chemical compatibility of Cf and Si3N4 is effectively improved by coating SiCnf on Cf , and Cf is well preserved in Si3N4 matrix and connected to each other into a conductive network, thus leading to the enhanced electron conduction and multiple relaxation phenomena in SiCn-Cf/Si3N4 composite. The SiCnf-Cf/Si3N4 composite exhibits the maximum dielectric loss value and the optimal microwave absorption performance both at room temperature and 800℃. At room temperature, the minimum reflection loss (RL) of SiCnf-Cf/Si3N4 composite is -15.2 dB at a thickness of 2.57 mm, and the effective absorption bandwidth (RL<-10 dB) is 1.9 GHz at a thickness of 2.30 mm. At 800℃, the minimum RL reaches -20.4 dB at a thickness of 2.0 mm, and the effective absorption bandwidth increases to 3 GHz at a thickness of 2.25 mm. The main absorbing mechanism of SiCnf-Cf/Si3N4 composite is multiple reflections and scattering, electrical conduction loss, electron polarization and multiple relaxations. At 800℃, the polarization and conduction of electrons are enhanced by the accelerated thermal motion of electrons, leading to a further enhancement in the microwave absorption performance. SiCnf-Cf/Si3N4 composite could be used as a high-performance microwave absorbing material for microwave absorption at a high temperature.

silicon nitride  /  composites  /  high temperature resistance  /  carbon fiber  /  silicon carbide nanofiber  /  microwave absorption properties
周伟, 张玉婷, 王晶晶, 庞亮, 李杨. SiCnf-Cf/Si3N4复合材料的微观结构与吸波性能. 硅酸盐学报, 2021 , 49 (9) : 1916 -1927 . DOI: 10.14062/j.issn.0454-5648.20200983
Wei Zhou, Yuting Zhang, Jingjing Wang, Liang Pang, Yang Li. Microstructure and Wave Absorption Properties of SiCnf-Cf/Si3N4 Composites[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (9) : 1916 -1927 . DOI: 10.14062/j.issn.0454-5648.20200983
  • 国家自然科学基金(51604107)
  • 湖南省自然科学基金(2019JJ50115)
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2021年第49卷第9期
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doi: 10.14062/j.issn.0454-5648.20200983
  • 接收时间:2020-12-30
  • 首发时间:2026-10-30
  • 出版时间:2021-09-20
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  • 收稿日期:2020-12-30
  • 修回日期:2021-03-04
基金
国家自然科学基金(51604107)
湖南省自然科学基金(2019JJ50115)
作者信息
    1.湖南工业大学冶金与材料工程学院,湖南 株洲 412007
    2.中南大学,粉末冶金国家重点实验室,长沙 410083

通讯作者:

李杨(1987—),男,副教授。
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2种不同金属材料的力学参数
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genus
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species
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Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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