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Cost effective preparation of Si3N4 ceramics with improved thermal conductivity and mechanical properties
Duan, YS; Liu, N; Zhang, JX; Zhang, H; Li, XG
2020-02-01
Source PublicationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
Issue2Pages:298
SubtypeArticle
AbstractHigh-purity silicon powder is used as the starting material for cost-effective preparation of silicon nitride ceramics with both high thermal conductivity and excellent mechanical properties using RE2O3 (RE= Y, La or Er) and MgO as sintering additives. Nitridation is a key procedure that would affect the properties of green bodies and the sintered samples. The beta: (alpha+beta) ratio can be increased as the samples nitrided at 1450 degrees C and a large amount of long rod-like beta-Si3N4 grains were developed in the samples. It was found that the addition of Er2O3-MgO could help to improve the mechanical properties of the sintered Si3N4 ceramics, the thermal conductivity, flexural strength and fracture toughness of the sample were 90 W/(m.K), 953 +/- 28.3 MPa and 10.64 +/- 0.61 MPa.m(1/2), respectively. The RE3+ species with larger ionic radius tended to increase the oxygen of nitrided samples and decrease N/O ratio (triangle grain boundary) of sintered samples.
DOI10.1016/j.jeurceramsoc.2019.10.003
WOS KeywordBONDED SILICON-NITRIDE ; PHASE-TRANSFORMATION ; OXYGEN-CONTENT ; POWDER ; MICROSTRUCTURE ; SI ; BETA-SI3N4 ; ADDITIVES ; KINETICS ; GROWTH
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28351
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Duan, YS,Liu, N,Zhang, JX,et al. Cost effective preparation of Si3N4 ceramics with improved thermal conductivity and mechanical properties[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2020(2):298.
APA Duan, YS,Liu, N,Zhang, JX,Zhang, H,&Li, XG.(2020).Cost effective preparation of Si3N4 ceramics with improved thermal conductivity and mechanical properties.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY(2),298.
MLA Duan, YS,et al."Cost effective preparation of Si3N4 ceramics with improved thermal conductivity and mechanical properties".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY .2(2020):298.
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