| Revue: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312815 |
| ISSN: | 1516-1439 |
| Autores: | Rocha, Rosa Maria da1 Bressiani, Jose Carlos Bressiani, Ana Helena de Almeida Greil, Peter2 |
| Instituciones: | 1Comissao Nacional de Energia Nuclear, Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo. Brasil 2University of Erlangen-Nuremberg, Department of Materials Science and Engineering, Erlangen, Baviera. Alemania |
| Año: | 2005 |
| Periodo: | Abr-Jun |
| Volumen: | 8 |
| Número: | 2 |
| Paginación: | 191-196 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | Research in the preparation of ceramics from polymeric precursors is giving rise to increased interest in ceramic technology because it allows the use of several promising polymer forming techniques. In this work ceramic composite pieces were obtained by pyrolysis of a compacted mixture of a polysiloxane resin and alumina/silicon powder. The mixture consists of 60 vol% of the polymer phase and 40 vol% of the filler in a 1:1 ratio for alumina/silicon, which was hot pressed to crosslink the polymer, thus forming a compact body. This green body was trimmed into different geometries and pyrolised in nitrogen atmosphere at temperatures up to 1600 °C. X-ray diffraction analysis indicated the formation of phases such as mullite and Si2ON2 during pyrolysis, that result from reactions between fillers, polymer decomposition products and nitrogen atmosphere. The porosity was found to be less than 20% and the mass loss around 10%. The complex geometry was maintained after pyrolysis and shrinkage was approximately 8%, proving pyrolisis to be a suitable process to form near-net-shaped bulk ceramic components |
| Disciplinas: | Ingeniería, Química |
| Palabras clave: | Ingeniería de materiales, Química de polímeros, Química industrial, Cerámica, Resinas, Síntesis química, Porosidad |
| Keyword: | Engineering, Chemistry, Materials engineering, Industrial chemistry, Polymer chemistry, Ceramics, Resins, Chemical synthesis, Porosity |
| Texte intégral: | Texto completo (Ver HTML) |
