THE IDEAL SOLUTION FOR COMPLICATED WEAR PROTECTION APPLICATIONS
Silicon carbide ceramic is distinguished from other wear protection materials in particular by its very high resistance to temperature fluctuations. Therefore, it is used both as protection against abrasive wear and shock wear at extremely high operating temperatures and at the same time strong and rapidly successive temperature changes.
MANUFACTURE AND PROPERTIES
According to the material classification for ceramic materials, silicon carbide ceramic belongs to the group of ceramic materials composed of non-oxides.
There are two types available:
• The starting point is high-quality raw materials of silicon carbide, silicon dioxide (SiO 2 ) and aluminium oxide
• Special quality due to a bond of silicon nitride (Si 3 N 4 )
SiC granules are mixed with temporary and permanent binders. Production takes place in a dry, semi-dry or compression process. Moulded parts are produced after the casting process, followed by a sintering process.
Features:
• Excellent resistance to temperature fluctuations
• High temperature resistance
• High hardness
• High thermal conductivity
• Resistance to corrosion
• Max. operating temperature up to 1400°C, depending on quality
Key Material Properties
ITEM: | UNIT: | DATA: |
Temperature | Celsius | 1380 c |
Density | g/cm³ | 3.1 – 3.2 |
Open porosity | % | ≤1.56 – 1.66 |
Bending strength | MPa | 250 ( 20 c ) |
MPa | 280 ( 1200 c ) | |
Modulus of elasticity | GPa | 330 ( 20 c ) |
GPa | 300 ( 1200 c ) | |
Thermal conductivity | W/m.k | 45 ( 1200 c ) |
Coefficient of thermal expansion | K-1 x 10-6 | 4.5 |
Rigidity | 13 | |
Acid proof alkaline | Excellent |
Standard Tolerance
Flatness | ≤ 0.2% |
Thickness | + / – 1.0 mm |
Length / Width | + / – 1.5 mm |
Key Applications
Reaction Bonded Silicon Carbide for Kiln Furniture and Support Components
– The high temperature strength, oxidation resistance and thermal shock resistance of Reaction Bonded SiC enables the manufacturer of low mass kiln supports. Kiln products include thin walled beams, posts, setters, burner nozzles and rolls. The components lower the thermal mass of kiln cars, result in energy savings and provide the possibility for faster product throughput.
Reaction Bonded Silicon Carbide for Wear Parts and Thrust Bearings
– Wear resistance, high temperature strength and corrosion resistance make Reaction Bonded SiC an ideal material for wear components, such as screws, plates and impellers. It can also be used in thrust bearings that can carry extremely high loads in heavily contaminated liquids.
Reaction Bonded Silicon Carbide for Mechanical Seals and Vanes
– Reaction Bonded SiC can be used in mechanical seals and pump vanes with high abrasion resistance.
Reaction Bonded Silicon Carbide for Precision Components
– The negligible volume change after reacting with liquid silicon means that components can be formed with complex shapes and to exacting tolerances. The components are lightweight and stiff with excellent thermal stability.