期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 35, 期 6, 页码 1991-1998出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.12.021
关键词
B4C; Spark-plasma sintering; Refractory ceramics; Nanostructured ceramics; Mechanical properties
资金
- Ministerio de Economia y Competitividad (MINECO
- Government of Spain)
- FEDER [MAT2012-38205-0O2-01]
- MINECO and FEDER [MAT2013-41012-P]
- Junta de Andalucia (Regional Government) through the Project of Excellence [P12-FQM-1079]
Densification of a commercially available B4C nanopowder by spark-plasma sintering (SPS) with nanograin retention was investigated, with emphasis on elucidating the potential of both single-step and two-step SPS cycles as well as the effect of pre-sintering annealing treatments of the nanopowders. It was found that single-step SPS does not allow a suitable processing window to obtain near-fully-dense B4C nanostructured ceramics from the as-received nanopowder, the cause being attributable to boria impurities producing coarsening. Pre-sintering annealing treatments of the nanopowder eliminate boria impurities thus facilitating the densification by single-step SPS, but at the expense of grain growth. Two-step SPS overcomes these drawbacks of the single-step approach (both without and with pre-sintering annealing treatments), enabling the desired densification of the as-received B4C nanopowder with nanograin retention (but nonetheless with a certain grain size heterogeneity). It was also found that the resulting ceramics are both superhard and toughened, highly desirable attributes in contact-mechanical and tribological applications. (C) 2014 Elsevier Ltd. All rights reserved.
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