Dielectric properties of spark plasma sintered AlN/SiC composite ceramics

In this study, we have investigated how the dielectric loss tangent and permittivity of AlN ceramics are affected by factors such as powder mixing methods, milling time, sintering temperature, and the addition of a second conductive phase. All ceramic samples were pre-pared by spark plasma sintering...

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Bibliographic Details
Published inInternational journal of minerals, metallurgy and materials Vol. 21; no. 6; pp. 589 - 594
Main Authors Gao, Peng, Jia, Cheng-chang, Cao, Wen-bin, Wang, Cong-cong, Liang, Dong, Xu, Guo-liang
Format Journal Article
LanguageEnglish
Published Beijing University of Science and Technology Beijing 01.06.2014
Springer Nature B.V
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Subjects
AlN陶瓷
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composite materials
Composites
Corrosion and Coatings
Dielectric loss
Dielectric properties
Dielectric strength
Electrical properties
Electromagnetic radiation
Glass
Materials Science
Metallic Materials
Natural Materials
Permittivity
SiC
Silicon carbide
Sintering (powder metallurgy)
Spark plasma sintering
Surfaces and Interfaces
Thin Films
Tribology
介电性能
介电损耗角正切
复合材料
放电等离子体
烧结温度
纳米碳化硅
ceramic materials
dielectric losses
aluminum nitride
silicon carbide
spark plasma sintering
composite materials
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Summary:In this study, we have investigated how the dielectric loss tangent and permittivity of AlN ceramics are affected by factors such as powder mixing methods, milling time, sintering temperature, and the addition of a second conductive phase. All ceramic samples were pre-pared by spark plasma sintering （SPS） under a pressure of 30 MPa. AlN composite ceramics sintered with 30wt%-40wt%SiC at 1600℃ for 5 min exhibited the best dielectric loss tangent, which is greater than 0.3. In addition to AlN and β-SiC, the samples also contained 2H-SiC and Fe5Si3, as detected by X-ray difraction （XRD）. The relative densities of the sintered ceramics were higher than 93%. Experimental results indicate that nano-SiC has a strong capability of absorbing electromagnetic waves. The dielectric constant and dielectric loss of AlN-SiC ce-ramics with the same content of SiC decreased as the frequency of electromagnetic waves increased from 1 kHz to 1 MHz.
Bibliography:In this study, we have investigated how the dielectric loss tangent and permittivity of AlN ceramics are affected by factors such as powder mixing methods, milling time, sintering temperature, and the addition of a second conductive phase. All ceramic samples were pre-pared by spark plasma sintering （SPS） under a pressure of 30 MPa. AlN composite ceramics sintered with 30wt%-40wt%SiC at 1600℃ for 5 min exhibited the best dielectric loss tangent, which is greater than 0.3. In addition to AlN and β-SiC, the samples also contained 2H-SiC and Fe5Si3, as detected by X-ray difraction （XRD）. The relative densities of the sintered ceramics were higher than 93%. Experimental results indicate that nano-SiC has a strong capability of absorbing electromagnetic waves. The dielectric constant and dielectric loss of AlN-SiC ce-ramics with the same content of SiC decreased as the frequency of electromagnetic waves increased from 1 kHz to 1 MHz.
11-5787/T
ceramic materials; composite materials; aluminum nitride; silicon carbide; spark plasma sintering; dielectric losses
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-014-0946-1