Effect of in-situ formed Y2O3 by metal hydride reduction reaction on thermal conductivity of beta-Si3N4 ceramics

doi:10.1016/j.jeurceramsoc.2020.06.005

SIC OpenIR

	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 Publication	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN	0955-2219
Issue	15 Pages:5316
Subtype	Article
Abstract	The 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.
DOI	10.1016/j.jeurceramsoc.2020.06.005
WOS Keyword	SILICON-NITRIDE CERAMICS ; MECHANICAL-PROPERTIES ; SI3N4 CERAMICS ; MGSIN2 ADDITION ; POWDER ; MICROSTRUCTURE ; GENERATION ; STRENGTH ; GLASSES ; OXYGEN
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/331005/27598
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.

Files in This Item:
There are no files associated with this item.

If you have any objections to this item, please fill out the form below and the administrator will contact you as soon as possible.
Content:
Email：	*
Institution:
Verification Code:	Refresh

Any comments and suggestions are welcomed.
Title:	*
Content:
Email：	*
Verification Code:	Refresh

中国科学院上海硅酸盐研究所机构知识库