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Martin Priem
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Silicon Carbide (Information)
General
Silicon carbide is one of the most important silicon carriers used in modern foundries. Thanks to its purely synthetic production and its formation at temperatures above 2400 °C, silicon carbide is free from tramp elements, impurities and reaction products, and is thus ideal for use in controlling the silicon and carbide content of the melt. Its chemical composition is 70 % silicon and 30 % carbon. As silicon carbide is the product of the electrothermal reduction of quartz sand (SiO2) and petroleum coke (C), the reaction product may, depending on its position relative to the thermal core, still contain free silicic acid and carbon.
Analysis
The lattice of silicon carbide corresponds crystallographically to that of diamond, but with a larger lattice spacing, which results in a certain brittleness. Silicon carbide is available with grain sizes up to 10/20 mm. Special screenings can also be supplied. Please note, however, that the extreme brittleness of SiC quickly results in undersized grains during packing and transport.
Silicon carbide is supplied for metallurgical applications with SiC contents of between 88-92 %. A typical analysis of superior standard quality contains the following concentrations:
| SiC |
88-92% |
| C free |
2-4% |
| Si02+Si |
3-5% |
| CaO |
0,08% |
| Residual oxide |
0,20% |
| Moisture |
0,25% |
Effect
In contrast to ferro silicon alloys, the melting temperatures of which lie between 1200 and 1500 °C, silicon carbide cannot technically be melted; rather, it is simply dissolved into the iron melt. This physical material characteristics results in the metallurgical advantage of high shortrange orders in respect of the silicon and carbon introduced by the SiC into the melt, creating the conditions for a high propensity towards grey solidification.
The physicochemically determined solution behaviour of SiC is thus readily suited to adjusting and controlling the nucleation state.
| Packing |
Bulk in silo, big bags, 25 kg paper bags on pallets |
| Storage |
Unhazardous, should be stored in a dry place |