| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312459 |
| ISSN: | 1516-1439 |
| Authors: | Izhevskyi, V.A1 Genova, L.A Bressiani, A.H.A Bressiani, J.C |
| Institutions: | 1Comissao Nacional de Energia Nuclear, Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo. Brasil |
| Year: | 2000 |
| Season: | Oct |
| Volumen: | 3 |
| Number: | 4 |
| Pages: | 131-138 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Descriptivo |
| English abstract | Microstructure development and phase formation processes during sintering of silicon carbide based materials with AlN-Y2O3, AlN-Yb2O3, and AlN-La2O3 sintering additives were investigated. Densification of the materials occurred by liquid-phase sintering mechanism. Proportion of alpha- and beta-SiC powders in the initial mixtures was a variable parameter, while the molar ratio of AlN/RE2O3, and the total amount of additives (10 vol. %) were kept constant. Shrinkage behavior during sintering in interrelation with the starting composition of the material and the sintering atmosphere was investigated by high temperature dilatometry. Kinetics of b-SiC to a-SiC phase transformation during post-sintering heat treatment at temperatures 1900-1950 °C was studied, the degree of phase transformation being determined by quantitative x-ray analysis using internal standard technique. Evolution of microstructure resulting from beta-SiC to alpha-SiC transformation was followed up by scanning electron microscopy on polished and chemically etched samples. Transformation-controlled grain growth mechanism similar to the one observed for silicon nitride based ceramics was established. Possibility of in-situ platelet reinforced dense SiC-based ceramics fabrication with improved mechanical properties by means of sintering was shown |
| Disciplines: | Ingeniería |
| Keyword: | Ingeniería de control, Ingeniería de materiales, Microestructuras, Carburo de silicio, Cerámica, Sinterización |
| Keyword: | Engineering, Control engineering, Materials engineering, Microstructures, Silicon carbide, Ceramics, Sintering |
| Full text: | Texto completo (Ver HTML) |
