The Properties of Si3N4 Material and Its Application in Refractory Materials |
Properties of Si3N4 Material:
Si3N4 material is the molecular form of silicon nitride. Of this, 60.06% of it is Si and 39.94% are N. Si and N are bonded through a strong covalent bonds (the ionic link is only 30%), so Si3N4's high hardness (Mohs toughness 9), high melting temperature and stable structure make it a Si3N4.
Silicon dioxide has a low melting point and can be sublimated at 1900°C under normal pressure with a specific heat value of 711.8J/kg*degC. The microhardnesses for a phase (b phase) and a phase (tenth-sixteenGPa respectively, are 24.532.65GPa. It is a strong covalent bonds compound so there won't be any liquid phase formation below its melting temperature of around 1900degC. It is essential that the silicon nitride materials be sintered with the aid of oxide additives. Most oxide materials that encourage sintering are Y2O3, Al2O3, and so on. The more the amount of addition is greater than 20%, the reaction principle is that the SiO2 oxide layer formed on the surface silicon nitride particle and the added oxide are combined to form a liquid phase which penetrates the crystal. This is to ensure that the material migrates well.
Si3N4 material has a high thermodynamic stability. Silicon nitride ceramics may be used in an oxidizing environment up to 1400°C, or in a neutral atmosphere up to 1850°C.
Refractory materials can use silicon nitride substances
High-temperature structural materials such as silicon nitride ceramics, which have excellent high-temperature characteristics like high-temperature strength and wear resistance, corrosion resistance, and high durability are well-known. Si3N4 ceramics can only be made due to their strong covalent bond, low diffusion coefficient at high temperatures, and need high temperature, pressure, and sintering agents. Otherwise, it would be difficult to produce high quality silicon nitride materials. This high production cost and the limitations of equipment are unacceptable for the metallurgical sector. The research in the area of refractories began late, and it was not extensive. While there are many theories that can be drawn from ceramics, the majority of them do not have much innovation. In the past, silicon Nitride was only used as a bonding agent in refractory material. The combination of aggregates, such as corundum, silica carbide, fine powder, and firing metal Si led to a variety of difficult-to sinter products.
The ceramic shed is made up of silicon carbide aggregate. The ceramic shed uses silicon carbide aggregate and part of the fine powder to combine silicon carbide into a silicon silica bonded silicon caride material. The material performs well at high temperatures, and is superior to the clay-bonded Silicon Carbide shed. This eliminates the issue of shrinkage and damage from silicon carbide oxidation. Baosteel's Second Phase project used amorphous materials as its binding phase. This includes Si3N4 and cast steel, which are resistant to corrosion.
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