The fabrication of tungsten reinforced silicon nitride ceramics by altering nitrogen pressure

doi:10.1016/j.ceramint.2018.12.061

SIC OpenIR

	The fabrication of tungsten reinforced silicon nitride ceramics by altering nitrogen pressure
	Wang, Lujie; Qi, Qian; Zhang, Hui; Yang, Xiao; Liu, Zehua; Wu, Haibo; Liu, Xuejian; Huang, Zhengren
	2019-04-01
Source Publication	CERAMICS INTERNATIONAL
ISSN	0272-8842
Volume	45 Issue:5 Pages:5927
Subtype	Article
Abstract	Due to high ductility, high-temperature melting, low thermal expansion coefficient, etc., tungsten (W) might be considered to be an ideal reinforcement in toughening or strengthening Si3N4 ceramics. However, it is difficult to fabricate W/Si3N4 composites due to the possible reactions between W and Si3N4 during sintering process at the high temperature. In this work, a novel way to avoid the reactions and fabricate the W/Si3N4 composites was proposed by thermodynamic analysis and verified by experiment. Firstly, the phase equilibrium between W and Si3N4 as a function of temperature and nitrogen pressure was thermodynamically calculated, which indicates that one critical nitrogen pressure exists for reactions between W and Si3N4 at a certain temperature. As the nitrogen pressure is higher than the critical value, the reactions would be inhibited or adversely proceeded. Based on the results, W was innovatively in-situ introduced in the form of WSi2 after sintering at 1750 degrees C under 50 bar nitrogen pressure. Moreover, the fracture toughness of Si3N4 ceramics was enhanced from 7.1 +/- 0.2 to 8.0 +/- 0.4 MPa m(1/2), which proposes a new reinforcement or method in toughening Si3N4 ceramics.
Keyword	Silicon nitride Tungsten Thermodynamics Fracture toughness
DOI	10.1016/j.ceramint.2018.12.061
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/331005/27235
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Wang, Lujie,Qi, Qian,Zhang, Hui,et al. The fabrication of tungsten reinforced silicon nitride ceramics by altering nitrogen pressure[J]. CERAMICS INTERNATIONAL,2019,45(5):5927.
APA	Wang, Lujie.,Qi, Qian.,Zhang, Hui.,Yang, Xiao.,Liu, Zehua.,...&Huang, Zhengren.(2019).The fabrication of tungsten reinforced silicon nitride ceramics by altering nitrogen pressure.CERAMICS INTERNATIONAL,45(5),5927.
MLA	Wang, Lujie,et al."The fabrication of tungsten reinforced silicon nitride ceramics by altering nitrogen pressure".CERAMICS INTERNATIONAL 45.5(2019):5927.

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