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Method for determining oxygen content in Nitride bonded silicon carbide products
- Oct 25, 2018 -

Nitrogen-carbon bonded silicon carbide products The silicon nitride-bonded silicon carbide material is a new type of advanced refractory material. It is formed by high-temperature nitridation using silicon carbide and silicon as raw materials in the presence of a small amount of additives. Excellent performance, such as decomposition temperature up to 2500 ° C, high temperature resistant cryolite corrosion, not wetted by non-ferrous metals and molten steel.


At present, the most commonNitride bonded silicon carbide products are silicon nitride bonded silicon carbide radiant tubes, silicon nitride bonded silicon carbide bricks, and the like. Silicon nitride-bonded silicon carbide materials are widely used in industries such as non-ferrous metals and metallurgy. Because the increase in oxygen content in silicon nitride-bonded silicon carbide materials leads to corrosion resistance, we need to determine the amount of oxygen in the material.


An analysis report on the amount of oxygen inNitride bonded silicon carbide products has been reported abroad, but a domestic research report on the determination of oxygen content in silicon nitride-bonded silicon carbide materials is not available in China. The oxygen content of the existing non-oxide powders is determined by a steel standard sample calibration instrument. Due to the high melting point of non-oxide materials,Nitride bonded silicon carbide articles need to be melted in the presence of high temperatures and fluxes.


The pulsed melt infrared absorption spectroscopy method using tin foil as a flux to measure the oxygen content in tantalum carbide and molybdenum disilicide is better. When studying the surface oxygen measurement of metal and ceramic powders, it was found that the silicon nitride and silicon carbide nano-mixed powders exposed to the air would undergo significant oxidation reaction, and there was no change in the adsorption oxygen on the surface of the sample. Therefore, degassing treatment is necessary in the determination of oxygen in the powder material. The conditions for wrapping samples and fluxing with tin foil and nickel foil were investigated.