NDLI: Dielectric properties of spark plasma sintered AlN/SiC composite ceramics

Content Provider	Springer Nature Link
Author	Gao, Peng Jia, Cheng chang Cao, Wen bin Wang, Cong cong Liang, Dong Xu, Guo liang
Copyright Year	2014
Abstract	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 prepared by spark plasma sintering (SPS) under a pressure of 30 MPa. AlN composite ceramics sintered with 30wt%–40wt% SiC at 1600°C 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 Fe$_{5}$Si$_{3}$, 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 ceramics with the same content of SiC decreased as the frequency of electromagnetic waves increased from 1 kHz to 1 MHz.
Starting Page	589
Ending Page	594
Page Count	6
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	21
Issue Number	6
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2014-05-31
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ceramic materials composite materials aluminum nitride silicon carbide spark plasma sintering dielectric losses Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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