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 language | English |
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Pages (from-to) | 167-173 |
Number of pages | 7 |
Journal | Journal of Reinforced Plastics and Composites |
Volume | 28 |
Issue number | 2 |
DOIs | |
State | Published - Jan 2009 |
Keywords
- Ceramic-matrix composites (CMCs)
- Mechanical properties
- Microstructures
- Reinforced
- Sintering