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Effect of in-situ formed Y2O3 by metal hydride reduction reaction on thermal conductivity of beta-Si3N4 ceramics
Wang, WD; Yao, DX; Liang, HQ; Xia, YF; Zuo, KH; Yin, JW; Zeng, YP
2020-12-01
Source PublicationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
Issue15Pages:5316
SubtypeArticle
AbstractThe effect of YH2 on densification, microstructure, and thermal conductivity of Si3N4 ceramics were investigated by adjusting the amount of YH2 in the range of 0-4 wt% using a two-step sintering method. Native SiO2 was eliminated, and Y2O3 was in situ formed by a metal hydride reduction reaction, resulting in various Y2O3/SiO2 ratios. Full densification of YH2-doped samples could be achieved after sintering at 1900 degrees C for 4 h. The Y2O3/SiO2 ratio had a significant influence on the composition of crystalline secondary phases. Besides, the increased Y2O3/SiO2 ratio is conducive not only to the grain growth but also to the reduction of activity of SiO2 in the liquid phase, resulting in enlarged purified grains, reduced volume fraction of intergranular phases and increased Si3N4 -Si3N4 contiguity. Ultimately, the thermal conductivity increased by 29 % from 95.3 to 123.0 W m(-1 )K(-1) after sintering at 1900 degrees C for 12 h by the substitution of Y2O3 with YH2.
DOI10.1016/j.jeurceramsoc.2020.06.005
WOS KeywordSILICON-NITRIDE CERAMICS ; MECHANICAL-PROPERTIES ; SI3N4 CERAMICS ; MGSIN2 ADDITION ; POWDER ; MICROSTRUCTURE ; GENERATION ; STRENGTH ; GLASSES ; OXYGEN
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27598
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Wang, WD,Yao, DX,Liang, HQ,et al. Effect of in-situ formed Y2O3 by metal hydride reduction reaction on thermal conductivity of beta-Si3N4 ceramics[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2020(15):5316.
APA Wang, WD.,Yao, DX.,Liang, HQ.,Xia, YF.,Zuo, KH.,...&Zeng, YP.(2020).Effect of in-situ formed Y2O3 by metal hydride reduction reaction on thermal conductivity of beta-Si3N4 ceramics.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY(15),5316.
MLA Wang, WD,et al."Effect of in-situ formed Y2O3 by metal hydride reduction reaction on thermal conductivity of beta-Si3N4 ceramics".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY .15(2020):5316.
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