Resin-bonded carbon-containing magnesia bricks have been used in the steel industry, especially in alkaline oxygen converters and electric arc furnaces because of their excellent thermal shock resistance and slag resistance. Carbon has excellent properties such as high thermal conductivity, low thermal expansion coefficient, high thermal shock stability, and poor wettability with molten slag to make it better resistant to corrosion and erosion. As we all know, the carbon in the brick body is easily oxidized, which restricts its use at high temperatures. The oxidation of carbon begins at 300°C, and the oxidation rate increases with increasing temperature.
Coatings on flake graphite or carbon fiber with ceramic materials (SiC, silicon oxycarbide), impregnation with phosphates, cement foam board prices, and the use of surface glazes. These costly methods have some limitations in the use of refractory bricks. Another method is to use steam treatment to make fine particles of materials such as boron, TiB2, ZrB2, and SiC as thermal barrier coatings on graphite or carbon composites.
One method commonly used in refractory bricks is to add fine-grained antioxidant materials such as SiC, B4C, metal Al, Mg, and/or Si to prevent or limit carbon at high temperatures (>1400) in MgO-C bricks. °C) Oxidation. As such, these additives are expensive and do not completely prevent the oxidation of carbon at low temperatures. The coating solution was made from a mixture of 60% solids and 40% liquids where the liquid binding agent was a mixture of phosphoric acid and ethanol (30% liquid solution). The thickness of the outer coating of the MgO-C brick is about 0.8 mm after coating, and the coated sample is dried at room temperature for about 10 minutes. In practice, the ladle is pre-heated to 1 200 °C over 5 h, sometimes requiring more time due to some difficulties in the steelmaking process.
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