Abstract
Silicon carbide multilayer composites containing short carbon fibres (C sf/SiC) were prepared by tape casting and pressureless sintering. C fibres were dispersed in solvents and then mixed with SiC slurry to make green C sf/SiC tape. Triton X-100 was found to be the best one for Toho Tenax HTC124 fibres (with water soluble coating) among BYK-163, BYK-410, BYK-2150, BYK-9076, BYK-9077 and Triton X-100 dispersants. C sf/SiC multilayer composites containing 5 vol.% fibre (mean fibre length of 3, 4.5, and 6 mm) were obtained. Addition of short C fibres seems to worsen the densification process in the C sf/SiC multilayer composites, whereas anisotropy shrinkage in C sf/SiC was also observed. Open pores size was increased slightly after the addition of C fibre but it decreased with the mean fibre length. Mechanical properties were affected by high residual porosity. The addition of short C fibre has not changed the crack deflection at weak interfaces. C sf/SiC multilayer composites containing longer fibres (4.5 and 6 mm) presented higher elastic modulus, bending strength and Vickers hardness as compared to shorter fibres (3 mm). Improved sintering performance and fibre content are necessary to improve mechanical properties.
Original language | English |
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Pages (from-to) | 1011-1018 |
Number of pages | 8 |
Journal | Ceramics International |
Volume | 38 |
Issue number | 2 |
DOIs | |
State | Published - Mar 2012 |
Externally published | Yes |
Keywords
- A. Tape casting
- C. Mechanical properties
- Composite
- Multilayer
- Short fibre