Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 12, Pages 4354-4360Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.05.033
Keywords
B4C; Aqueous colloidal processing; Slip casting; Pressureless spark-plasma sintering; Mechanical properties
Categories
Funding
- Ministerio de Economia y Competitividad (Government of Spain)
- FEDER Funds [MAT2016-76638-R, RTI2018-099033-B-C33]
- Junta de Extremadura [PD16027, GR18149]
- FEDER Funds
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Superhard composites of B4C reinforced with randomly-oriented reduced graphene oxide (rGO) nanoplatelets are manufactured by a near-net-shape fabrication route based on three successive steps. Firstly, aqueous colloidal processing is used for the environmentally-friendly preparation of a semi-concentrated multi-component slurry (B4C as main component, Ti-Al as sintering additive, and rGO as toughening reinforcement), whose suitability for wet shaping is demonstrated by rheological measurements. Secondly, slip casting is used to produce robust green parts with shapes on demand and microstructures free of macro- and micro-defects. And thirdly, pressureless spark-plasma sintering (PSPS) is used for the ultrafast and energy-efficient densification of the green parts with shape retention. Measurements of shrinkage and hardness, as well as the microstructural observations, are used to identify suitable PSPS temperatures leading to obtaining isotropic B4C/rGO composites that are superhard and almost twice as tough as the monolithic B4C ceramics.
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