Microstructure, phase compositions and mechanical properties of slip cast sintered SiC/Si3N4 composites
| Autor: | Mohammadali Beheshti, Saeid Kakooei, Mokhtar Che Ismail, Shohreh Shahrestani |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Slip (ceramics) Casting Surfaces Coatings and Films Electronic Optical and Magnetic Materials Flexural strength visual_art Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Particle Particle size Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 47:13173-13180 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.01.182 |
| Popis: | In this study, a slurry containing a mixture of Si and SiC powders was used to fabricate the SiC/Si3N4 composites by slip casting method and sintering in a nitrogen-controlled furnace. The effects of mixing ratios of Si and SiC powders, different particle sizes of SiC powders as well as three sintering temperatures (1400, 1450, 1490 °C) were evaluated for SiC–Si3N4 composites. The results demonstrated that the best slurry was prepared using the weight ratio of Si/SiC of 30/70 and the fine-particle size of SiC powders with an average particle size of d50 ≤ 0.45 μm. The results of XRD and FESEM determined that the sintered composites at 1450 °C have the minimum porosity without the SiO2 phase. Besides, with an increase in the sintering temperature, the α/β-Si3N4 phase ratio increased while the hardness and flexural strength were strongly dependent on the α/β-Si3N4 phase ratio in the SiC–Si3N4 composites. |
| Databáze: | OpenAIRE |
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