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Effect of LaB6 addition on mechanical properties and thermal conductivity of silicon nitride ceramics
Liang, HQ; Wang, WD; Zuo, KH; Xia, YF; Yao, DX; Yin, JW; Zeng, YP
2020-08-01
Source PublicationCERAMICS INTERNATIONAL
ISSN0272-8842
Issue11Pages:17776
SubtypeArticle
AbstractSi3N4 ceramics was hot-pressed with LaB6-MgO as sintering additives in the temperature range from 1550 degrees C to 1750 degrees C for 2 h under the external mechanical pressure of 60 MPa, followed by post-sintering treatment at 1900 degrees C for 2 h under the N-2 pressure of 2 MPa. The effect of sintering temperature on the densification behavior, mechanical properties, thermal conductivity, phase composition and microstructure evolution were investigated in detail. Compared to the Si3N4 ceramics sintered with La2O3-MgO, the addition of LaB6-MgO was beneficial for the improvement of fracture toughness, Vickers' hardness and thermal conductivity of Si3N4 ceramics. The maximum Vickers' hardness of 18.98 +/- 0.63 GPa was achieved at 1550 degrees C. The bending strength of 1039.1 +/- 70.1 MPa and fracture toughness of 8.46 +/- 0.23 MPa m(1/2) could be obtained at 1750 degrees C. After post-sintering treatment, the Si3N4 ceramics exhibited improved thermal conductivity of 75.63 W m(-1)K(-1) and fracture toughness of 8.72 +/- 0.11 MPa m(1/2) due to the repeated dissolution-precipitation process.
DOI10.1016/j.ceramint.2020.04.083
WOS KeywordBETA-SI3N4 ; SI3N4 ; MICROSTRUCTURE
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27871
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Liang, HQ,Wang, WD,Zuo, KH,et al. Effect of LaB6 addition on mechanical properties and thermal conductivity of silicon nitride ceramics[J]. CERAMICS INTERNATIONAL,2020(11):17776.
APA Liang, HQ.,Wang, WD.,Zuo, KH.,Xia, YF.,Yao, DX.,...&Zeng, YP.(2020).Effect of LaB6 addition on mechanical properties and thermal conductivity of silicon nitride ceramics.CERAMICS INTERNATIONAL(11),17776.
MLA Liang, HQ,et al."Effect of LaB6 addition on mechanical properties and thermal conductivity of silicon nitride ceramics".CERAMICS INTERNATIONAL .11(2020):17776.
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