KMS Shanghai Institute of Ceramics，Chinese Academy of Sciences
| 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 Publication | CERAMICS INTERNATIONAL
 |
| ISSN | 0272-8842 |
| Issue | 11Pages:17776 |
| Subtype | Article |
| Abstract | Si3N4 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. |
| DOI | 10.1016/j.ceramint.2020.04.083 |
| WOS Keyword | BETA-SI3N4 ; SI3N4 ; MICROSTRUCTURE |
| Language | 英语 |
| WOS Research Area | Materials Science |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://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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