High temperature mechanical properties of porous Si3N4 prepared via SRBSN
| Autor: | Hanqin Liang, Jinwei Yin, Yongfeng Xia, Huanbei Chen, Dongxu Yao, Yu-Ping Zeng, Kaihui Zuo |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology 02 engineering and technology Intergranular corrosion 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Phase (matter) visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Fracture (geology) Degradation (geology) Ceramic Composite material 0210 nano-technology Porosity Internal oxidation |
| Zdroj: | Ceramics International. 44:11966-11971 |
| ISSN: | 0272-8842 |
| Popis: | The high temperature strength and fracture behavior of porous Si3N4 ceramics prepared via reaction bonded Si3N4 (RBSN) and sintered reaction bonded Si3N4 (SRBSN) were investigated at 800–1400 °C. The weight gain after oxidation for 15 min and the microstructure of the edge and center of the fracture surface clearly show that the internal oxidation of porous SRBSN is unavoidable with porosity of ~ 50% and mean pore size of 700 nm. The oxidation of Si3N4 and intergranular Y2Si3O3N4 phase may responsible for the high temperature strength degradation of SRBSN. Porous Si3N4 ceramics prepared with addition of 1 wt% C showed low strength degradation at temperature > 1200 °C. |
| Databáze: | OpenAIRE |
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