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Improved thermal conductivity of sintered reaction-bonded silicon nitride using a BN/graphite powder bed
Li, Yinsheng1; Kim, Ha-Neul1; Wu, Haibo2; Kim, Mi-Ju1; Ko, Jae-Woong1; Kim, Jin-Myung1; Park, Young-Jo1; Huang, Zhengren2; Kim, Hai-Doo1
2017
Source PublicationJournal of the European Ceramic Society
ISSN09552219
Volume37Issue:15Pages:4483-4490
AbstractSintered reaction-bonded silicon nitride (SRBSN) with improved thermal conductivity was achieved after the green compact of submicron Si powder containing 4.22 wt% impurity oxygen and Y2O3-MgO additives was nitrided at 1400 °C for 6 h and then post-sintered at 1900 °C for 12 h using a BN/graphite powder bed. During nitridation, the BN/10 wt% C powder bed altered the chemistry of secondary phase by promoting the removal of SiO2, which led to the formation of larger, purer and more elongated Si3N4grains in RBSN sample. Moreover, it also enhanced the elimination of SiO2and residual Y2Si3O3N4secondary phase during post-sintering, and thus induced larger elongated grains, decreased lattice oxygen content and increased Si3N4-Si3N4contiguity in final SRBSN product. These characteristics enabled SRBSN to obtain significant increase (∼40.7%) in thermal conductivity from 86 to 121 W m−1 K−1without obvious decrease in electrical resistivity after the use of BN/graphite instead of BN as powder bed. © 2017 Elsevier Ltd
DOI10.1016/j.jeurceramsoc.2017.05.045
EI Accession Number20172403755333
EI KeywordsThermal conductivity
EI Classification Number641.1 Thermodynamics - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 951 Materials Science
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25750
Collection中国科学院上海硅酸盐研究所
Affiliation1.Engineering Ceramics Research Group, Korea Institute of Materials Science, Changwon; Gyeongnam; 51508, Korea, Republic of;
2.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China
Recommended Citation
GB/T 7714
Li, Yinsheng,Kim, Ha-Neul,Wu, Haibo,et al. Improved thermal conductivity of sintered reaction-bonded silicon nitride using a BN/graphite powder bed[J]. Journal of the European Ceramic Society,2017,37(15):4483-4490.
APA Li, Yinsheng.,Kim, Ha-Neul.,Wu, Haibo.,Kim, Mi-Ju.,Ko, Jae-Woong.,...&Kim, Hai-Doo.(2017).Improved thermal conductivity of sintered reaction-bonded silicon nitride using a BN/graphite powder bed.Journal of the European Ceramic Society,37(15),4483-4490.
MLA Li, Yinsheng,et al."Improved thermal conductivity of sintered reaction-bonded silicon nitride using a BN/graphite powder bed".Journal of the European Ceramic Society 37.15(2017):4483-4490.
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