| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312826 |
| ISSN: | 1516-1439 |
| Authors: | Krauss, Vivian Alexandra1 Pires, Eduardo Nunes1 Klein, Aloisio Nelmo Fredel, Marcio Celso |
| Institutions: | 1Universidade Federal de Santa Catarina, Departamento de Engenharia Mecanica, Florianopolis, Santa Catarina. Brasil |
| Year: | 2005 |
| Season: | Abr-Jun |
| Volumen: | 8 |
| Number: | 2 |
| Pages: | 187-189 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | The rheological behavior of alumina molding feedstocks containing polyethylene glycol (PEG), polyvinylbutyral (PVB) and stearic acid (SA) and having different powder loads were analyzed using a capillary rheometer. Some of the feedstocks showed a pseudoplastic behavior of n < 0, which can lead to the appearance of weld lines on molded parts. Their viscosity also displayed a strong dependence on the shear rate. The slip phenomenon, which can cause an unsteady front flow, was also observed. The results indicate that the feedstock containing a lower powder load displayed the best rheological behavior. The 55 vol. % powder loaded feedstock presented the best rheological behavior, thus appearing to be more suitable than the formulation containing a vol. 59% powder load, which attained viscosities exceeding 10³ Pa.s at low shear rates, indicating its unsuitability for injection molding |
| Disciplines: | Ingeniería, Física y astronomía |
| Keyword: | Ingeniería de materiales, Ingeniería mecánica, Mecánica, elasticidad y reología, Alúmina, Materias primas, Polietilenglicol, Propiedades mecánicas |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Mechanical engineering, Mechanics, elasticity and rheology, Alumina, Raw materials, Polyethylene glycol, Mechanical properties |
| Full text: | Texto completo (Ver HTML) |
