Black Carborundum F020 F016 plays an important role in ductile iron casting. It can replace ferrosilicon as an Oxygen scavenger, inoculant and nebulizer in the metallurgical industry. The following are the main functions of black silicon carbide in ductile iron casting:
- Exhaust effect: Black carborundum (SiC) can generate gases such as CO and CO2. Thus it can effectively expel gases from castings and molten metals, and prevent the formation of pores. This is crucial for the quality and mechanical properties of ductile iron.
- Oxygen scavenger function: The carbon in the black silicon carbide can react with the oxygen in the molten iron to form CO gas. So the black carborundum plays the role of deoxidation. Deoxidation can reduce the oxygen content in castings, prevent the formation of oxide inclusions, and improve the mechanical properties of ductile iron.
- Catalytic crystallization: Black silicon carbide can serve as a seed catalyst to promote the formation of nodular graphite during the solidification process of ductile iron. It can promote the formation of spherical graphite particles, thereby increasing the toughness and impact resistance of cast iron.
- Silicon reinforcement effect: The silicon element in black silicon carbide can increase the hardness and strength of ductile iron. By adding an appropriate amount of black silicon carbide, the wear resistance, and corrosion resistance. In the meantime, the fatigue strength of ductile iron can be improved.
Overall, black carborundum particles (commonly used models F014, F016, F020) play a role in the exhaust, deoxidation, catalytic crystallization, and enhancing hardness and strength in ductile iron casting. These effects have a significant impact on the quality, mechanical properties, and usability of ductile iron. In actual production, it is necessary to control the addition amount and treatment method of black silicon carbide according to the specific situation to achieve the ideal casting effect.
