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Silicon Nitride properties
Si3N4 describes the molecular structure of silicon nitride. Si is responsible for 60.06% while dint N makes up for 39.94%. Si3N4 is strong because of the covalent bonds between N and Si (of which only 30% are ion bonds), and has high hardness (9 More hardness 9), high melting points and stable structures.
Si-N crystals of silicon nitride are mainly composed of covalent bonds. Because the bonding strength and bonding strength are high, they have a large elastic module (4.7 x105kg/cm2). Although the coefficient of thermal extension is very low, it is high in thermal conductivity. It is therefore difficult to generate thermal stress. The material has excellent thermal shock resistance as well as good thermal shock resistant. The material has high strength and low temperature deformation. At 1200 x 1000h the silicon nitride calcimic ceramic has a 2.5g/cm3 dense and is deformed at high temperatures of 0.5%. This also applies to 23 x 7.kg/cm2 (load). It is resistant to oxidation, and provides good insulation.
Silicon nitride does not melt and is sublimated and decomposes under 1900 atmospheric pressure. Specific heat is 7111.8J/kg A phase’s microhardness is 1016GPa while the phase in b is 24.532.65GPa. The strong covalent bonds compound means that no liquid phase is formed below the temperature at which it was decomposed (around 1900). Silicon nitride materials are therefore able to be sintered by using oxide additives. The most popular oxide materials for sintering include Y2O3, A2O3, and other types of Al2O3. High addition amounts can even reach 20%. It is based on the reaction principle that SiO2 oxide films formed on the surfaces of silicon particles undergo a chemical reaction with the added oxide. The liquid phase forms and permeates at the grain border to allow for good diffusion.
Chemical stability of Silicon Nitride
Si3N4 can be used as a thermodynamically stable material. Silicon nitride ceramics may be used as far as 1400 under an oxidation environment and 1850 when in neutral, reducing or neutral conditions. Si3N4’s oxidation reaction occurs at temperatures above 800C.
A dense layer of silica protection was slowly formed over the surface. This prevented Si3N4 from further oxidation. After the temperature reached above 1600, it was difficult to see any weight increase. In humid environments, Si3N4 is much more difficult to oxidize. Surface oxidization begins at 200. This is twice the speed of dry air. Si3N4 in water vapour has an oxidation activation energetic that is lower than the one in oxygen or air. This is because Si3N4 can be reacted with water vapor through SiO2 films.
Silicon nitride does not react to corrosion. Cu solution cannot be eroded by vacuum, inert atmosphere, or Mg. Silicon solution can weakly react with Si3N4 and cause it to erode; Si3N4 can be wetted and slightly eroded; and transition element solution can strong wet Si3N4 forming silicide with Si. This will allow silicon nitride to rapidly decompose while also escaping N2. While Si3N4 can withstand alloy solutions like brass, aluminum, hard and nickel silver and is very resistant to corrosion, it cannot withstand stainless steel or Ni-Cr.
Other than molten NaOH, HF and Si3N4, silicon nitride exhibits good resistance to chemical corrosion. Si3N4 is able to interact with most alkali, salt, and molten acids that can decompose the silicon nitride.
Silicon Nitride for Refractories.
High temperature ceramics made of silicon nitride are known for their promise as promising materials. They have excellent properties at high temperatures, including high heat strength, wear resistance and corrosion resistance. The strong covalent bond at high temperatures and low diffusion coefficient make Si3N4 ceramics difficult to manufacture. The limitations of equipment and production costs are not easily accepted by the metallurgical sector. This means that research into refractories is often late in its development and does not go deep. While there are many theories based on ceramics, not much new research is available. The bonding phase of refractories was the usual form for silicon nitride in the past. Fine powder was combined with aggregates like corundum and silicon carbide by nitriding metal Si. This allowed for the combination of refractory materials. Part of the fine powder and silicon carbide aggregate ceramic shed plate are made from ceramic. The nitriding of Si metal to create silicon nitride forms silicon nitride. Combining silicon carbide with silicon nitride is what results in silicon nitride bond silicon carbide material. This material can be used for blast furnace bodies and other applications. The material’s performance has been significantly improved. It is much more stable than clay-bonded silicon caride shed plate. The high temperature performance solves bulging problems caused by the oxidation.
Silicon nitride Price
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Silicon nitride Supplier
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