Behavior of short carbon fibers in Cfiber/Si3N 4 composites by hot pressed sintering

Xiaoyan Wang, Dongmei Zhu, Peng Li, Xiaolei Su, Fa Luo, Wancheng Zhou

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3 Scopus citations

Abstract

Cfiber/Si3N4 composites were prepared by introducing short carbon fibers into a mixture of silicon nitride and sintering additives (La2O3ĝ€"Y2O 3) by hot pressed sintering. The effects of fibers on microstructure and mechanical properties of composites were discussed after higher temperature sintering. The corrosion of carbon fibers was manifested in two characteristic ways: (1) the internal fiber had exfoliative structure and some serious cavities were easily found at the interfaces between Si3N4 matrix and carbon fibers; (2) the fiber surface was covered by β2-Si 3N4 crystallites. When the fiber content varied from 0 to 1 wt%, the fracture toughness increased from 6.6 MPa ̇ m1/2 to 8.01 MPa ̇ m1/2. The flexural strength decreased from 638.14 MPa to 584.63 MPa with the rise of short fiber content.

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalJournal of Reinforced Plastics and Composites
Volume28
Issue number2
DOIs
StatePublished - Jan 2009

Keywords

  • Ceramic-matrix composites (CMCs)
  • Mechanical properties
  • Microstructures
  • Reinforced
  • Sintering

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