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Mechanical properties optimization of Si3N4 ceramics by in-situ introduction of core-shell structural W-Fe5Si3
Wang, LJ; Qi, Q; Yang, X; Zhang, H; Liu, ZH; Ge, S; Peng, XL; Liu, LM; Liu, Y; Liu, XJ; Huang, ZR; Jiang, DL
2020-09-01
Source PublicationCOMPOSITES PART B-ENGINEERING
ISSN1359-8368
SubtypeArticle
AbstractIt is one inevitable problem that optimizing properties of Si3N4 ceramics by introducing second phase would produce thermal mismatch stress, which may lead to interfacial bonding and strength deterioration. In this work, a novel strategy for regulating the residual thermal stress and inhibiting the interfacial debonding in Fe5Si3/Si3N4 ceramics was proposed, which results in the simultaneous increase of strength and toughness of Si3N4 ceramics. Instead of Fe5Si3 particle, the core-shell structural W-Fe5Si3 particles were in situ generated in the Si3N4 matrix by introducing a new WSi2/FeSi2 powder directly. The maximum principal stress, residual radial and tangential stress around the core-shell structural W-Fe5Si3 and Fe5Si3 particle were compared by using the finite element method. The W core inhibits the radial contraction of the Fe5Si3 shell during the cooling process and alters the residual thermal stress distribution. Both the Griffith fracture equation and Lange's energy model indicate that the core-shell structural W-Fe5Si3 inhibits the interfacial debonding, which is consistent with the experiment result. As a result, with the increase of WSi2/FeSi2 addition from 0 to 1 wt%, the fracture toughness of Si3N4 ceramics increases from 7.1 to 7.7 MPa m(1/2), and the strength improves from 1016 to 1173 MPa.
DOI10.1016/j.compositesb.2020.108134
WOS KeywordSILICON-NITRIDE CERAMICS ; STRENGTHENING MECHANISMS ; STRESS-DISTRIBUTION ; FRACTURE-TOUGHNESS ; RESIDUAL-STRESSES ; COMPOSITE ; SIZE ; TEMPERATURE ; PREDICTION ; BEHAVIOR
Language英语
WOS Research AreaEngineering ; Materials Science
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27802
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Wang, LJ,Qi, Q,Yang, X,et al. Mechanical properties optimization of Si3N4 ceramics by in-situ introduction of core-shell structural W-Fe5Si3[J]. COMPOSITES PART B-ENGINEERING,2020.
APA Wang, LJ.,Qi, Q.,Yang, X.,Zhang, H.,Liu, ZH.,...&Jiang, DL.(2020).Mechanical properties optimization of Si3N4 ceramics by in-situ introduction of core-shell structural W-Fe5Si3.COMPOSITES PART B-ENGINEERING.
MLA Wang, LJ,et al."Mechanical properties optimization of Si3N4 ceramics by in-situ introduction of core-shell structural W-Fe5Si3".COMPOSITES PART B-ENGINEERING (2020).
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