Effect of Graphene on Microstructure and Mechanical Properties of Si3N4/SiC Ceramics
Hailing Yang, Qinggang Li, Zhi Wang, Hao Wu, Yuying Wu, Pengkun Hou and Xin Cheng
1 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan, 250022, China
2 School of Material Science and Engineering, University of Jinan, Jinan, 250022, China
3 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, 17923 Jingshi Road, Jinan, 250061, China
Abstract
Graphene with 0.3% content was added to enhance the fracture toughness of Si3N4/SiC ceramics prepared by pressureless sintering. The microstructure, mechanical properties and toughening mechanism of ceramics were investigated. Results showed that the fracture strength significantly increased from 329.11 MPa to 443.19 MPa after adding graphene. The main toughening mechanism of ceramics was crack deflection since the existence of graphene platelets. The main phase compositions of samples were β-Si3N4 with a high aspect ratio and SiC located in the grain boundary, and the SiC particles could avoid the excessive growth of β-Si3N4 to reduce the strength.
Publication details
Received: 11 Jan 2021
Revised: 01 Feb 2021
Accepted: 01 Feb 2021
Published online: 02 Feb 2021
Article type:
Research Paper
DOI:
10.30919/esmm5f418
Volume:
12
Page:
29-34
Citation:
ES Materials & Manufacturing, 2021, 12, 29-34
Permissions:
Copyright
Number of downloads:
3175
Citation Information:
10
Description:
The strengthening mechanism of graphene in ceramic was described from the microstructure. ....
The strengthening mechanism of graphene in ceramic was described from the microstructure.
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