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The effect of annealing temperature on flexural strength, dielectric loss and thermal conductivity of Si3N4 ceramics
Chen, HB; Wang, WD; Yu, X; Zuo, KH; Xia, YF; Yin, JW; Liang, HQ; Yao, DX; Zeng, YP
2020-01-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
SubtypeArticle
AbstractEffect of annealing temperatures on flexural strength, dielectric and thermal properties of Si3N4 ceramics was investigated with different amounts of Yb2O3 (3.5 mol% and 7 mol%) as sintering additives. High density of >99% were achieved after hot pressing. The post annealing heat treatment promoted the crystallization of the grain boundary glass phase. Low dielectric loss of <4 x 10(-4) were obtained for all samples, a low dielectric loss of 1.8 x 10(-4) was achieved by annealing at 1500 degrees C for 24 h with 7 mol% Yb2O3 as sintering additives. A mild anisotropic microstructure was obtained due to merit of hot pressing method. High thermal conductivity of >75 W/(m.K) and >90 W/(m.K) were obtained in the direction parallel and perpendicular to the hot-pressing direction in all samples, respectively. The low flexural strength of similar to 600 MPa may attribute to the large grain in the matrix and lack of elongated abnormal grains. (C) 2019 Elsevier B.V. All rights reserved.
DOI10.1016/j.jallcom.2019.152203
WOS KeywordSILICON-NITRIDE CERAMICS ; MECHANICAL-PROPERTIES ; PHASES ; MGO
Language英语
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28376
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Chen, HB,Wang, WD,Yu, X,et al. The effect of annealing temperature on flexural strength, dielectric loss and thermal conductivity of Si3N4 ceramics[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020.
APA Chen, HB.,Wang, WD.,Yu, X.,Zuo, KH.,Xia, YF.,...&Zeng, YP.(2020).The effect of annealing temperature on flexural strength, dielectric loss and thermal conductivity of Si3N4 ceramics.JOURNAL OF ALLOYS AND COMPOUNDS.
MLA Chen, HB,et al."The effect of annealing temperature on flexural strength, dielectric loss and thermal conductivity of Si3N4 ceramics".JOURNAL OF ALLOYS AND COMPOUNDS (2020).
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