期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 5, 页码 1297-1302出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.11.034
关键词
ZrO2; Reduced graphene oxide; Nanocomposites; Spark plasma sintering
资金
- National Research Foundation of Korea (NRF)
- Korean government (MSIP) [NRF-2012R1A2A4A01008226]
- National Research Foundation of Korea [2012R1A2A4A01008226] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Fully dense yttria-stabilized zirconia (YSZ) ceramics reinforced with reduced graphene oxide (RGO) were fabricated by spark plasma sintering (SPS), and their electrical, thermal, and mechanical properties were investigated. Graphene oxide (GO) was exfoliated by a short sonification in dimethylformamide (DMF)/water solution and uniformly mixed with ZrO2 powders. The microstructure of the composites showed that undamaged RGO sheets were homogeneously distributed throughout matrix grains. The electrical conductivity of YSZ composites drastically increased with the addition of RGO, and it reached 1.2 x 10(4) S/m at 4.1 vol.%. However, the thermal diffusivity increased only 12% with RGO addition. The hardness decreased slightly with RGO addition, whereas the fracture toughness significantly increased from 4.4 to 5.9 MPa1/2. The RGO pull-out and crack bridging contributed to the improved fracture toughness. (C) 2013 Elsevier Ltd. All rights reserved.
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