Field assisted sintering of graphene reinforced zirconia ceramics

Title
Field assisted sintering of graphene reinforced zirconia ceramics
Author(s)
한영환Fei Chen[Fei Chen]D. Jin[D. Jin]K. Tyeb[K. Tyeb]B. Wang[B. Wang]김석영J. Schoenung[J. Schoenung]Q. Shen[Q. Shen]L. Zhang[L. Zhang]
Keywords
MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; TRANSFORMATION; TEMPERATURE; ALLOYS
Issue Date
201505
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.41, no.4, pp.6113 - 6116
Abstract
Three mol. % yttria stabilized zirconia (3Y-TZP) with Graphene platelets (GNPs) powder mixture was produced by ball milling using dimethyl formamide (DMF) as dispersion media. The GNPs-reinforced 3Y-TZP composites were densified (similar to 99%) by field assisted sintering technology (FAST). A homogeneous dispersion of GNPs in 3Y-TZP is observed from the sintered samples, and the GNPs are bent and embedded between the grains, which results in increasing the contact area. The trans-granular mechanism of crack propagation becomes increasingly dominant by adding GNPs. The fracture toughness reaches 15.3 MPa . m(1/2), as tested by single-edge notched beam method, which reflects an increase of 61% compared to GNPs-free 3Y-TZP. On the other hand, with higher GNPs content, the improvement in fracture toughness is limited. Toughening mechanisms, as determined through micro-hardness testing, including pull out, crack deflection, crack bridging, and micro-cracks, are observed and discussed. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/32414http://dx.doi.org/10.1016/j.ceramint.2014.12.147
ISSN
0272-8842
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공과대학 > 신소재공학부 > Articles
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