Silicon Carbide is Synthetic material having combination of Silicon Carbon. It is granular, low sulphur additive to C.I. and S.G. Iron.

Function

Silicon Carbide is a refined ,synthetically manufactured product containing combination of Silicon and Carbon with very low sulphur. It is used to raise the Silicon and Carbon content in C.I. and S.G. Iron. It is required to sprayed on to liquid metal. It dissolve after 1200 degrees and Silicon and Carbon gets absorbed in to the metal.

Application Rate

The quantity of application depends upon initial Silicon and Carbon level in the metal and the finally 90% to 92% and recovery of Silicon ranging from 60% & Carbon ranging from 20% to30%. Normal addition rate ranges from 0.1 to 0.8% of metal. It is used in induction furnaces.

Advantages

Economical way to add Silicon and Carbon Very low level of Sulphur It reduces Pin Hole porosity. It reduces Chilling tendency. It improves machinability. It improves furnace lining life.
The influence of silicon carbide as silicon carries and as carburiser on the cooling curve characteristics of cast iron is significant quality contributor.
Silicon Carbide is a compound containing around 70% Silicon and 30% Carbon by weight. It is Commercially produced by the reduction of Silica Sand with Carbon, in the form of petroleum cake, in cylindrical electric resistance furnaces through Acheson process. contains more than 80% SiC is used and the alloying additive for introducing silicon and carbon into gray cast iron, ductile iron and steel melts. It dissociates into nascent Si & Cast 1000°C. This Reaction is exothermic.

Beneficial effects of SiC Additions:

• Pre-inoculation behavior of Sic, with a slow fading tendency within the melt during solidification
• Works deodorizer
• SiC instead of FeSi or Graphite yields favorable change in the thermal analysis characteristics.
• Enhancing machinability and improving mechanical properties.
• Improves Fluidity, Microstructure, Chill depth and hardness of gray and ductile cast iron poured at different temperatures
• Reduces FeO and MnO in the slag leading to increased refractory lifetime
• Increased melt temperature facilitating better thin wall castings

Packing: In 25 Kg LDPE lined HDPE Bags, Suggested to keep in packed condition until use.

Trials with Silicon Carbide

Once the base metal was ready for pouring, SiC was added into the furnace as per the regular foundry practice and after 5 minutes of dwell time, the metal was taken for analysis. Improvements in the metal quality was observed after addition of SiC.

Conclusion

The silicon carbide is used as a source of silicon and carbon in casting irons with low levels of impurities, when compared to other sources of silicon and carbon. In addition, the silicon carbide increases the cast iron nucleation and consequently improves the final quality of the casting iron product. Also, it provides a cost reduction in the process. Thus, the silicon carbide becomes a good alternative as a source of silicon and carbon in the production process casting irons.

Recommendation for Addition and Trial report can be request from us.