| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312896 |
| ISSN: | 1516-1439 |
| Autores: | Acchar, Wilson1 Cairo, Carlos Alberto2 |
| Instituciones: | 1Universidade Federal do Rio Grande do Norte, Departamento de Fisica, Natal, Rio Grande do Norte. Brasil 2Instituto de Aeronautica e Espaco, Centro Tecnico Aeroespacial, Sao Jose dos Campos, Sao Paulo. Brasil |
| Año: | 2006 |
| Periodo: | Abr-Jun |
| Volumen: | 9 |
| Número: | 2 |
| Paginación: | 171-174 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | Recent studies published in the literature have focused on reinforcing alumina with different refractory carbides and nitrides in order to improve hardness, fracture toughness and wear resistance. The incorporation of hard particles as WC, (Ti,W)C and NbC on alumina matrix has shown to be a good alternative in improving the mechanical properties of the composite material. The present work reports some preliminary results obtained reinforcing alumina with 20 wt. (%) (Ti,W)C and 10 wt. (%) NbC. Alumina, (Ti,W)C and NbC powders were homogenized and mixed in a planetary ball mill and subsequently hot-pressed at 1650 °C under 20 MPa in flowing argon. Specimens were characterized by Vicker's microhardness (HV), fracture toughness (KIC), X ray diffraction and scanning microscopy. The composite material showed hardness values of 19.5 GPa and fracture toughness values » 5.2 MPa.m1/2. The high fracture toughness encountered in this work is related to the crack deflection mechanism |
| Disciplinas: | Ingeniería, Física y astronomía |
| Palabras clave: | Ingeniería de materiales, Física de materia condensada, Cerámica, Alúmina, Tratamiento químico, Propiedades mecánicas, Dureza, Fracturas |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Condensed matter physics, Ceramics, Alumina, Chemical treatment, Mechanical properties, Hardness, Fractures |
| Texto completo: | Texto completo (Ver HTML) |
