Ferrosilicon Nitride
is a composite obtained through nitration of Ferro Silicon 75% at right temperature and controlled pressure.
Production Process
Nitrogen production and nitration furnaces
FeSi2 75%
Nitrogen Production Cell
Furnaces for production
Capacity: 45.000 MT/year
FeSi3N4 powder
Ball grinder for processing
FeSi3N4 powder (10MT/hour)
Quality Control equipment
Grindind mill and final quality control
Packaging and international expedition
Technical Features
Refractoriness exceeding
1700 °C (3092 °F)
High resistance to corrosion caused by liquid metals
Very stable chemically and thermally
High spalling resistance
Small thermal expansion rate
High thermal conductivity
Appropriate hardness
Tap-Hole Clays
Tap-Hole Clays added with Ferrosilicon Nitride were developed to increase productivity and quality of metals produced in blast furnaces. Tap-Hole and gutter materials made with the addition of Ferrosilicon Nitride proved to be highly effective and are widely used by the leader companies of the steel industry that aim high performance for the blast-furnace production. Ferrosilicon Nitride content vary from 5 to 30% depending on the operating conditions, mainly the size of the blast furnace and the conditions of hot-metal and slag discharge.
Relation between level of Si3N4 and corrosion rate of tap-hole clays. Relation between level Fe-Sin and corrosion rate of tap-hole clays.
Refractories
The introduction of Ferrosilicon Nitride increases the strength and wear resistance of the refractories at high temperature, increases their thermal stability and resistance to oxidation, and reduces the thermal-expansion coefficient, with simultaneous increase in thermal conductivity.
Ferrosilicon Nitride refractories have a smaller coefficient of thermal expansion compared to the silicon carbide and high alumina refractories. Ferrosilicon Nitride refractories are more resistant to abrasion by the hot metal and the slag and they do not shrink on repeated heating.
Rate of thermal expansion in relation to temperature of ferrosilicon nitride and refractory bricks
Metals & Steel
Ferro Silicon Nitride is an alloy additive in smelting of cold-rolling orientated silicon steel. Its addition increases strength and improves corrosion-resistance, thermal shock resistance and abrasion resistance of steels. In comparison with the traditional manganese and chromium alloys used for alloying in smelting corrosion-resistant steel, the consumption of the ferrosilicon nitride is considerably less.
An electric arc furnace is used during the smelting process of steel
Advanced Ceramics
Advanced Ceramics with additions of Ferrosilicon Nitride have been replacing metals in the production of bearings, mechanical seals, chemical pumps, nozzles, auto parts, heat exchange components, welding pins, vacuum equipment and a variety of harsh environment. Ferrosilicon Nitride Ceramics are suitable for high temperature structural materials allowing high strength, good wear resistance, high stiffness and corrosion resistance.
Special Coatings
Due to the use of Ferrosilicon Nitride, it is possible to achieve temperature resistance and stable layers with excellent anti adherent properties in Casting Coatings and Industrial & Maintenance paints. Those properties are retained even in direct contact with liquid metals and slag. The layer can therefore protect the painted surface reducing wear and improving lubricating property.
