Ferrosilicon nitride and
ferro silicon sound like two very similar products, but in fact, they are fundamentally different. This article will explain the difference between the two from different angles.
Definition Difference
Ferro silicon and ferrosilicon nitride have different compositions and properties.
What Is Ferrosilicon Nitride?
Ferrosilicon nitride is a composite material of silicon nitride, iron and ferrosilicon. It is usually made by direct nitridation of ferrosilicon alloy FeSi75 at high temperature. The mass fraction of Si3N4 accounts for 75%~80%, and the mass fraction of Fe accounts for 12%~17%. Its main phases are α-Si3N4 and β-Si3N4, in addition to some Fe3Si, a small amount of α-Fe and a very small amount of SiO2.
As a new type of non-oxide refractory raw material,
ferrosilicon nitride has good sintering and chemical stability, high refractoriness, low thermal expansion coefficient, good thermal shock resistance, high temperature strength and thermal conductivity, good corrosion resistance and wear resistance.
What Is Ferrosilicon?
Ferrosilicon (FeSi) is an alloy of iron and silicon, mainly used for steelmaking deoxidation and as an alloying component. ZhenAn is one of the leading suppliers of high-quality ferrosilicon alloys in China, and we are ready to help you determine the best product for your application.
In terms of classification
The two have their own different product classifications.
Ferro silicon nitride has high hardness, high melting point and excellent wear resistance. According to different production processes and formulas, silicon nitride iron can be divided into the following types:
Ferro silicon nitride (Si3N4-Fe): Silicon nitride iron is obtained by mixing silicon source, nitrogen source (such as ammonia) and iron powder and reacting at high temperature. Ferro silicon nitride has high hardness, high melting point, good wear resistance and strong oxidation resistance, and is often used to manufacture high-temperature wear-resistant materials and ceramic tools.
Ferro silicon nitride alloy (Si3N4-Fe): Silicon nitride iron alloy is obtained by mixing silicon, nitrogen source and iron powder in a certain proportion and reacting at high temperature. Silicon nitride iron alloy has high hardness, high melting point, good wear resistance, high strength and toughness, and is often used to manufacture high-strength wear-resistant materials and structural parts.
What Are The Types Of Ferrosilicon?
Ferrosilicon is usually classified according to the content of various minor components, depending on the application requirements. These categories include:
Low carbon ferrosilicon and ultra-low carbon ferrosilicon - used to avoid reintroduction of carbon when making stainless steel and electrical steel.
Low titanium (high purity) ferrosilicon - used to avoid TiN and TiC inclusions in electrical steel and some special steels.
Low aluminum ferrosilicon - used to avoid the formation of hard Al2O3 and Al2O3–CaO inclusions in a range of steel grades.
Special ferrosilicon - a general term covering a range of customized products containing other alloying elements.
Differences In Production Processes
Ferrosilicon nitride and silicon nitride have different production processes.
The production of ferrosilicon nitride mainly involves mixing silicon powder, iron powder and carbon source or nitrogen source in a certain proportion, and placing the mixed materials in a high-temperature reactor for high-temperature reaction. The reaction temperature of ferrosilicon carbide is usually 1500-1800 degrees Celsius, and the reaction temperature of ferrosilicon nitride is usually 1400-1600 degrees Celsius. The reaction product is cooled to room temperature, and then ground and sieved to obtain the desired ferrosilicon nitride product.
Production Process Of Ferrosilicon
Ferrosilicon is generally smelted in an ore-fired furnace, and then a continuous operation method is used. What is a continuous operation method? It means that the furnace is continuously melted after high temperature, and new charge is continuously added during the entire smelting process. There is no arc exposure during the process, so the heat loss is relatively small.
Ferrosilicon can be continuously produced and smelted in large, medium and small submersible furnaces. The furnace types are fixed and rotary. The rotary electric furnace has been widely used this year because the rotation of the furnace can reduce the consumption of raw materials and electricity, reduce the labor intensity of processing charge, and improve labor productivity. There are two types of rotary electric furnaces: single-stage and double-stage. Most furnaces are circular. The bottom of the furnace and the lower working layer of the furnace are built with carbon bricks, the upper part of the furnace is built with clay bricks, and self-baking electrodes are used.
Different application fields
In terms of application, the two are also very different.
Application: Mainly used in the steel manufacturing industry, as a deoxidizer and alloy additive, it can improve the strength, hardness and corrosion resistance of steel.
Application: Commonly used in manufacturing wear-resistant and corrosion-resistant tools and parts, such as knives, bearings, and other fields that require high strength and wear resistance
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