Application of Boron Carbide as Antioxidant Additive in Low Carbon Magnesia Carbon Bricks
Boron carbide is used as an antioxidant additive for low-carbon magnesia-carbon bricks and castables. It is used in the key parts of high temperature resistance and erosion resistance in the iron and steel industry.
A boron carbide-graphite thermocouple consists of a graphite tube, a boron carbide rod, and a boron nitride bushing between them. In inert gas and vacuum, the service temperature is as high as 2200°C. Between 600 and 2200°C, the potential difference has a good linear relationship with temperature.
At present, the use performance of low-carbon magnesia-carbon bricks is generally improved by improving the bonded carbon structure, optimizing the matrix structure of magnesia-carbon bricks, and adding high-efficiency antioxidants. Among them, graphitized carbon black composed of industrial grade B4C and partly graphitized carbon black is used. Composite powder, which is used as carbon source and antioxidant for low-carbon magnesia-carbon bricks, has achieved good results. The low-carbon magnesia-carbon bricks added with B4C have good conventional physical properties, oxidation resistance and thermal shock stability.