Direct in situ observation of toughening mechanisms in nanocomposites of silicon nitride and reduced graphene-oxide

SCRIPTA MATERIALIA

卷:149

Article

Ramirez, Cristina¹  Wang, Qizhong¹  Belmonte, Manuel²  Miranzo, Pilar²  Isabel Osendi, M.²  Sheldon, Brian W.¹  Padture, Nitin P.¹ 

[1] Brown Univ, Sch Engn, Providence, RI 02912 USA

[2] CSIC, Inst Ceram & Glass ICV, E-28049 Madrid, Spain

关键词: Silicon nitride;    Graphene;    Graphene oxide;    Ceramic;    Nanocomposite;    Toughening;   

DOI  :  10.1016/j.scriptamat.2018.02.004

来源: Elsevier

【 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.

【 授权许可】

Free