Fabrication of Al2O3/W Nanocomposites [Translated]†
| Autor: | Tohru Sekino, Atsushi Nakahira, Koichi Niihara, Masahiro Nawa |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | KONA Powder and Particle Journal, Vol 10, Iss 0, Pp 192-197 (2014) |
| Druh dokumentu: | article |
| ISSN: | 0288-4534 2187-5537 |
| DOI: | 10.14356/kona.1992024 |
| Popis: | The Mechanical properties and microstructure of Al2O3/ W composites have been investigated. These composites were fabricated by hot-pressing a mixture of γ- or α- phase alumina (Al2O3) and fine tungsten (W) powders. In these composites, fine W particles were located both within the Al2O3 matrix grains and at the grain boundaries. The fracture strength of Al2O3/5vol%W composites sintered at 1400ºC was 700 MPa, which is approximately 1.6 times higher than that of monolithic-Al2O3 prepared by way of the same processing method. But, the strength decreased with an increase in the sintering temperature. Although the interactions between cracks and W dispersion were partly observed, the fracture toughness was not significantly enhanced. It is believed that the presence of nanostructures do not sufficiently act on the mechanical properties of the composites because the grain boundary of the Al2O3 matrix where large W particles are located is not significantly strengthened by dispersion.† This report was originally printed in Journal of the Japan Society of Powder and Powder Metallurgy, 38(3), 326-330 (1991) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of Japan Society of Powder and Powder Metallurgy. |
| Databáze: | Directory of Open Access Journals |
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