Microstructure and fracture toughness of Si3N4 + graphene platelet composites

被引：153

作者：

Dusza, Jan ^{[1
]}

Morgiel, Jerzy ^{[2
]}

Duszova, Annamaria ^{[1
]}

Kvetkova, Lenka ^{[1
]}

Nosko, Martin ^{[3
]}

Kun, Peter ^{[4
]}

Balazsi, Csaba ^{[4
]}

机构：

[1] Slovak Acad Sci, Inst Mat Res, Kosice 04353, Slovakia

[2] Polish Acad Sci, Inst Met & Mat Sci, PL-30059 Krakow, Poland

[3] Inst Mat & Machine Mech SAS, Bratislava 83102, Slovakia

[4] Res Inst Tech Phys & Mat Sci, Ceram & Nanocomposites Dept, H-1525 Budapest, Hungary

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 12期

关键词：

Si3N4; Nanocomposites; Platelets; Graphene; Toughness and toughening; SILICON-NITRIDE; MECHANICAL-PROPERTIES; MULTILAYER GRAPHENE; EXFOLIATION; COMPOSITES; GRAPHITE;

D O I：

10.1016/j.jeurceramsoc.2012.04.022

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

081705 [工业催化]; 082905 [生物质能源与材料];

摘要：

Silicon nitride + 1 wt% graphene platelet composites were prepared using various graphene platelets (GPLs) as filler. The influence of the addition of GPLs on the microstructure development and on the fracture toughness of Si3N4 + GPLs composites Was investigated. The GPLs with thickness from 5 nm to 50 nm are relatively homogeneously distributed in the matrix of all composites, however overlapping/bundle formation of GPLs was found, containing 2-4 platelets as well. The single GPLs and overlapped GPLs are located at the boundaries of Si3N4, and hinder the grain growth and change the shape of the grains. The fracture toughness was significantly higher for all composites in comparison to the monolithic Si3N4 with the highest value of 9.9 MPa m(0.5) for the composite containing the GPLs with smallest dimension. The main toughening mechanisms originated from the presence of graphene platelets, and responsible for the increase in the fracture toughness values are crack deflection, crack branching and crack bridging. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：3389 / 3397

页数：9

共 27 条

[1]

Development of CNT/Si3N4 composites with improved mechanical and electrical properties [J].