Toughness and R-curve behaviour of laminated Si3N4/SiCw ceramics
| Autor: | Lijuan Zhou, Liu Yeqing, Zhen Liu, Peng Wang, Qiyan Sun, Heng Zhang, Yun Wu, Chuncheng Wei |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Tape casting Toughness Materials science Process Chemistry and Technology Whiskers Composite number 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Thermal expansion Surfaces Coatings and Films Electronic Optical and Magnetic Materials Residual stress Indentation visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 47:18693-18698 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.03.202 |
| Popis: | Laminated Si3N4/SiCw ceramics were successfully prepared by tape casting and hot-pressing. Its mechanical properties were measured and the impact resistance was discussed. The toughness of the laminated Si3N4/SiCw ceramics was 13.5 MPa m1/2, which was almost 1.6 times that of Si3N4/SiCw composite ceramics, namely 8.5 MPa m1/2. Moreover, the indentation strength of laminated Si3N4/SiCw ceramics was not sensitive to increasing indentation loads and exhibited a rising R-curve behaviour, indicating that the laminated Si3N4/SiCw ceramics had excellent impact resistance. The improved toughness and impact resistance of laminated Si3N4/SiCw ceramics was attributed to the residual stress caused by a thermal expansion coefficient mismatch between the different layers, resulting in crack deflection and bridging of SiC whiskers in the interface layer, thus consuming a large amount of fracture work. |
| Databáze: | OpenAIRE |
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