Silicon nitride composites with magnesia and alumina additives: Toughening mechanisms and mechanical properties
作者: C.C. YeH.Q. RuZ.B. QinS.W. ZhaoH.S. JiaD.L. Chen
作者单位: 1Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, China
2Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
3Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping, 136000, China
刊名: Materials Science & Engineering A, 2020, Vol.779
来源数据库: Elsevier Journal
DOI: 10.1016/j.msea.2020.139140
关键词: Silicon nitride ceramic compositeMechanical propertyStrengthFracture toughnessToughening mechanism
英文摘要: Abstract(#br)This work was aimed to investigate the effect of magnesia (MgO) and aluminia (Al 2 O 3 ) additives on the microstructure and mechanical properties of silicon nitride (Si 3 N 4 ) ceramic composites, focusing on the salient toughening mechanisms. The application of MgO additives led to a denser and more uniform microstructure consisting of distinctive rod-like Si 3 N 4 grains with higher aspect ratios, and thus a high flexural strength of 1039±78 MPa and fracture toughness of ~11.6 MPa m 1/2 , in comparison with the composite with Al 2 O 3 additives, where inhomogeneous structure and abnormal grain growth occurred. Underlying toughening mechanisms in the Si 3 N 4 ceramic composites, including crack deflection, crack bridging and rod-like grain pull-out were observed, leading to...
全文获取路径: Elsevier  (合作)
影响因子:2.108 (2012)

  • alumina 矾土
  • composites 菊科植物
  • additives 附加剂
  • mechanical 机械的
  • properties 道具
  • nitride 氮化物
  • magnesia 氧化镁