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SiCw in Toughening Composites Silicon Carbide Whisker
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silicon carbide whisker :
Basicproperty: Decomposition Temperature (K): 2973 Heating Power (KJ/mol): 30.343 Linear Expansion Coefficient (373K): 6.58× 10-6 Linear Expansion Coefficient(1173K): 2.98 × 10-6
Thermal Conductance: Compression Coefficient: 0.21× 10-6 Density (288K) (g/cm3): 3.216 Hardness (Mohs): 9.5
A cardinal principle of Silicon Carbide Whisker in toughening composite
In the SiCw toughening composite material, both whisker and matrix match in physical and chemical properties match, can obtain the good interface bonding, improve the composite material of strong toughness
Sicw widely use in Toughening metal matrix,ceramic matrix and polymer matrix composite .
1.SiCw in toughening Al2O3ceramic matrix composites |
Al2O3ceramic : High melting point and hardness but toughness and strength is relatively low ↓ SiCw Toughening and strengthening ↓ Al2O3 - SiCw ceramic toughness have reached above 9MPa·m1/2 , strength can reach above 600 ~ 900 mpa [24] Al2O3 - SiCw ceramic: cutting tool ,ceramicsengine , internal combustion engine
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| 2.SiCw in toughening ZrO2 ceramic matrix composites |
ZrO2 ceramic : widely used in fireproofing but in high temperature ,the mechanical properties worsen ↓ SiCw Toughening and strengthening ↓ ZrO2- SiCw ceramic can apply in 1350°c ZrO2- SiCw ceramic: Gas turbine rotor , Turbine set blade , C eramic engine parts , Ceramic tool , Wire drawing tool, bearing |
| 3. SiCw in toughening mullite ceramic matrix composites |
Mullite ceramic: The high quality refractory, but toughness is relatively low, which affects its practical application ↓ 10%SiCw Toughening and strengthening ↓ Mullite-SiCw ceramic Toughness can be increased by more than 100%, the highest can amount to 6.37 MPa · m1/2 Mullite-SiCw ceramic :Thermal protective equipment ,rocket nozzle |
| 4. SiCw in glass-ceramics matrix composites |
| Glass-ceramics : SiCw Toughening and strengthening ↓ 1) keep the advantage of the glass:easy to forming 2) strength and toughness can be increased by more than double toughess: reach 460MPa, strength : 4.3MPa·m1/2 Glass-SiCw ceramic : Biological ceramic material,Preparation of artificial teeth , bone joint , bone repair materials
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