In the process of modern metallurgical industry's continuous pursuit of efficient and high-quality production, Ferro silicon nitride powder has become an important material to promote the progress of metallurgical technology with its unique properties, playing an irreplaceable role in many key links.
A powerful assistant in the iron-making process of blast furnaces
When the blast furnace is tapping iron, the performance of the tapping clay is related to the smoothness of the tapping. Silicon nitride powder is a key component of high-quality tapping clay. When heated, it reacts with other components of the tapping clay to accelerate sintering, allowing the tapping clay to be formed faster and with better molding quality, and can remain stable in the harsh environment of the blast furnace.
At high temperatures, silicon nitride generates new phases, such as Si₂N₂O, SiC and AlN, which strengthen the tapping clay matrix, and iron elements also participate in optimizing the structure. At the same time, SiO₂ generated by silicon nitride oxidation reacts with l₂O₃ to form mullite, which greatly improves the corrosion resistance of the tapping clay, prolongs its service life, reduces the maintenance of the tapping hole, and ensures the continuous production of the blast furnace.
In addition, when heated, Si3N4 powder decomposes N₂ and CO gas, forming pores in the tapping mud and improving the hole opening performance. After the iron is tapped, the tapping mud containing ferro silicon nitride is easy to open, and it can also reduce the infiltration and erosion of molten iron and slag, and reduce the risk of operation.
High-quality additives for special alloy production
In the manufacture of special alloys, the addition of FeSi nitride powder can optimize the microstructure. Its silicon element refines the grains, increases the grain boundary area, hinders the movement of dislocations, and improves the strength and toughness of the alloy; the nitrogen element forms nitrides, plays a role in dispersion strengthening, improves the strength and hardness; the iron element adjusts the electronic structure and improves the processing performance.
The alloy modified by silicon nitride powder has significantly improved comprehensive performance. In terms of strength, the yield and tensile strength are improved, and it can withstand higher loads; in terms of toughness, the grains are refined and the uniform strengthening phase is strengthened, so that the impact resistance and fatigue resistance of the alloy are enhanced. At the same time, the wear resistance and corrosion resistance of the alloy are also improved. For example, aircraft engine blades are made of alloys containing silicon nitride iron powder, which can operate stably in extreme environments.
Deoxidation and desulfurization helper in the steelmaking process
When making steel, removing oxygen and sulfur is critical. Silicon in ferro silicon nitride powder is a strong deoxidizer. It reacts with oxygen at high temperature to form SiO₂, which is removed in the form of slag and can fine-tune the composition of molten steel. Its nitrogen element can also stabilize the austenite structure.
For desulfurization, calcium (containing a small amount of impurity calcium) in Si3N4 powder reacts with sulfur to form CaS and enter the slag. In addition, it changes the physical and chemical properties of molten steel, promotes mass transfer between slag and molten steel, and the compounds formed can also absorb sulfur, synergistically improving the desulfurization efficiency and improving the purity and quality of steel.
In the key links of blast furnace iron-making, special alloy production and steelmaking in the metallurgical field, ferrosilicon nitride powder provides strong support for the efficient and high-quality production of the metallurgical industry with its outstanding performance in promoting the performance improvement of taphole mud, optimizing the alloy structure and assisting deoxidation and desulfurization. With the continuous advancement of technology, its application prospects will be broader.
