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Enhanced thermal conductivity in Si3N4 ceramic by addition of a small amount of carbon
Li, Yinsheng; Kim, Ha-Neul; Wu, Haibo; Kim, Mi-Ju; Ko, Jae-Woong; Park, Young-Jo; Huang, Zhengren; Kim, Hai-Doo
2019
Source PublicationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
Volume39Issue:2019-02-03Pages:157
SubtypeArticle
AbstractIn order to fabricate Si3N4 ceramic with enhanced thermal conductivity, 93 mol%alpha-Si3N4-2 mol%Yb2O3-5 mol% MgO powder mixture was doped with 5 mol% carbon, and sintered firstly at 1500 degrees C for 8 h and subsequently at 1900 degrees C for 12 h under 1 MPa nitrogen pressure. During the first-step sintering, the carbothermal reduction process significantly reduced the oxygen content and increased the N/O ratio of intergranular secondary phase, resulting in the precipitation of Yb2Si4O7N2 crystalline phase, higher beta-Si3N4 content and larger rod-liked beta-Si3N4 grains in the semi-finished Si3N4 sample. After the second-step sintering, the final dense Si3N4 product acquired coarser elongated grains, lower lattice oxygen content, tighter Si3N4-Si3N4 interfaces and more devitrified intergranular phase due to the further carbothermal reduction of oxynitride secondary phase. Consequently, the addition of carbon enabled Si3N4 ceramic to gain a significant increase of similar to 25.5% in thermal conductivity from 102 to 128 W.m(-1) K--(1).
KeywordSilicon nitride Carbon Microstructure Thermal conductivity
DOI10.1016/j.jeurceramsoc.2018.10.006
WOS KeywordBONDED SILICON-NITRIDE ; MECHANICAL-PROPERTIES ; BETA-SI3N4 CERAMICS ; SIALON CERAMICS ; OXYGEN-CONTENT ; BORON-CARBIDE ; SI POWDER ; MICROSTRUCTURE ; LATTICE ; CRYSTALLIZATION
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27556
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Li, Yinsheng,Kim, Ha-Neul,Wu, Haibo,et al. Enhanced thermal conductivity in Si3N4 ceramic by addition of a small amount of carbon[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2019,39(2019-02-03):157.
APA Li, Yinsheng.,Kim, Ha-Neul.,Wu, Haibo.,Kim, Mi-Ju.,Ko, Jae-Woong.,...&Kim, Hai-Doo.(2019).Enhanced thermal conductivity in Si3N4 ceramic by addition of a small amount of carbon.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,39(2019-02-03),157.
MLA Li, Yinsheng,et al."Enhanced thermal conductivity in Si3N4 ceramic by addition of a small amount of carbon".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 39.2019-02-03(2019):157.
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