Products Description
Ferro silicon nitride (Fe-Si3N4) is a novel nitride based raw material synthesized using nitriding technology at high temperatures. In the 1970s, Japan successfully developed this new silicon nitride refractory material, silicon iron nitride. It is the product of nitriding silicon iron alloy powder by heating it in a chemical atmosphere to 1200-1400 ℃. Its main component is 75%~80% (w) silicon nitride, and it also contains free iron and non nitrided FeSi. Since then, many countries have started researching silicon iron nitride as a material.
Due to its excellent high-temperature performance, corrosion resistance, wear resistance, and sintering properties, high thermal conductivity, and small coefficient of thermal expansion, silicon nitride iron is widely used not only in blast furnace slurry, but also in refractory materials such as carbon containing refractory materials, high-temperature structural materials, and magnesium based castables.
Preparation method of ferro silicon nitride
Direct hydrogenation method:
The direct ammonification method is to prepare silicon iron nitride powder by nitriding silicon iron powder and silicon powder in nitrogen at high temperature for a long time. The "manufacturing method of silicon iron nitride" invented in the literature is to use silicon powder and silicon iron powder as raw materials, under a nitrogen atmosphere, at a temperature of 1000-1400 ℃, with a heating rate higher than 10 ℃ - h-1, to produce silicon iron nitride through long-term nitriding. The direct nitriding method has high temperature and long time. In order to reduce the nitriding temperature and shorten the nitriding time, mechanical chemical methods are used to treat the raw materials, while others first treat the raw materials and then further adjust the firing system. Research has shown that the particle size of silicon iron powder has a significant impact on the nitriding effect during the direct nitriding process, with finer silicon iron powder (d50=5.229) μ m) When nitriding, the reaction speed is fast and the reaction is intense, leading to severe sintering and poor nitriding effect; And the coarser silicon iron powder (d50=13.41) μ m) The nitriding effect is good.
Overall, the advantages of direct nitriding method for preparing Fe-Si3N4 are simple process and less equipment required; The disadvantages are low nitriding rate, long nitriding time, and high energy consumption. In addition, to obtain a high content of B-Si3N4, it is necessary to undergo long-term high-temperature nitriding, which greatly increases energy consumption.
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