• 文献标题:   Direct in situ observation of toughening mechanisms in nanocomposites of silicon nitride and reduced graphene-oxide
  • 文献类型:   Article
  • 作  者:   RAMIREZ C, WANG QZ, BELMONTE M, MIRANZO P, OSENDI MI, SHELDON BW, PADTURE NP
  • 作者关键词:   silicon nitride, graphene, graphene oxide, ceramic, nanocomposite, toughening
  • 出版物名称:   SCRIPTA MATERIALIA
  • ISSN:   1359-6462
  • 通讯作者地址:   Brown Univ
  • 被引频次:   2
  • DOI:   10.1016/j.scriptamat.2018.02.004
  • 出版年:   2018

▎ 摘  要

In situ observations are performed, for the first time, of stable crack propagation in nanocomposites of silicon nitride (Si3N4) and reduced graphene-oxide (rGO) inside a scanning-electron microscope. Two different specimen geometries (wedge-splitting and double-cantilever beam) are used to observe crack interactions with rGO stacks in two different orientations (cross-section and in-plane). These observations provide new insights into the unique, effective pull-out of crack-bridging rGO stacks, which appears to be responsible for the extraordinary toughness in the Si3N4/rGO nanocomposites. These insights could be used to design and create future ceramic/rGO nanocomposites with superior mechanical properties. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.