Microstructure and mechanical properties of self-Reinforced alpha–Silicon carbide
| Autor: | Chung-Sun Lee, Hyung-Bock Lee, Young-Wook Kim, Hun-Jin Lim, Duk-Ho Cho |
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| Rok vydání: | 1998 |
| Předmět: |
Equiaxed crystals
Toughness Materials science Process Chemistry and Technology Metallurgy chemistry.chemical_element Yttrium Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Grain growth chemistry.chemical_compound Fracture toughness chemistry Aluminium Materials Chemistry Ceramics and Composites Silicon carbide |
| Zdroj: | Ceramics International. 24:489-495 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/s0272-8842(97)00047-3 |
| Popis: | Fine (0.46 μ m) α -SiC powders with or without large (2 μ m) α-SiC particles (seeds) added were pressureless-sintered at 1900°C for 1, 4, and 8 h with addition of yttrium aluminum garnet (YAG). The introduction of larger seeds into fine α -SiC accelerated the grain growth of some α -SiC grains and resulted in self-reinforced microstructure consisted of large elongated grains and small equiaxed grains. In contrast, the material without seeds had a relatively equiaxed grain structure. Development of self-reinforced microstructure results in significant improvements in toughness. However, the improved toughness is offset by a significant reduction in strength. The fracture toughness of the 8-h sintered materials without or with seeds was 4.6 and 6.2 MPa m 1/2 , respectively. |
| Databáze: | OpenAIRE |
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