• 文献标题:   Fabrication and properties of graphene reinforced silicon nitride composite materials
  • 文献类型:   Article
  • 作  者:   YANG YP, LI B, ZHANG CR, WANG SQ, LIU K, YANG B
  • 作者关键词:   graphene, silicon nitride ceramic, hot pressing, pressureless sintering, mechanical propertie
  • 出版物名称:   MATERIALS SCIENCE ENGINEERING ASTRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE PROCESSING
  • ISSN:   0921-5093 EI 1873-4936
  • 通讯作者地址:   Natl Univ Def Technol
  • 被引频次:   13
  • DOI:   10.1016/j.msea.2015.07.062
  • 出版年:   2015

▎ 摘  要

Silicon nitride (Si3N4) ceramic composites reinforced with graphene platelets (GPLs) were prepared by hot pressed sintering and pressureless sintering respectively. Adequate intermixing of the GPLs and the ceramic powders was achieved in nmethyl-pyrrolidone (NMP) under ultrasonic vibration followed by ball-milling. The microstructure and phases of the Si3N4 ceramic composites were investigated by Field Emission Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). The effects of GPLs on the composites' mechanical properties were analyzed. The results showed that GPLs were well dispersed in the Si3N4 ceramic matrix. beta-Si3N4, O'-sialon and GPLs were present in the hot-pressed composites while pressureless sintered composites contain beta-Si3N4, Si, SiC and GPLs. Graphene has the potential to improve the mechanical properties of both the hot pressed and pressureless sintered composites. Toughening effect of GPLs on the pressureless sintered composites appeared more effective than that on the hot pressed composites. Toughening mechanisms, such as pull-out crack bridging and crack deflection induced by GPLs were observed in the composites prepared by the two methods. (C) 2015 Elsevier B.V. All rights reserved.