Corundum silicon carbide castable uses high-purity alumina and silicon carbide as the main raw materials. This refractory castable product has excellent wear resistance and corrosion resistance. The advantage of the silicon carbide castable refractory is that the service life is 2-3 times that of other refractory lining materials.
Corundum silicon carbide castable refractory is mostly used to construct and repair waste incinerator linings and rotary kiln outlet linings. Silicon carbide is widely used in abrasives, heating elements, structural ceramics, and refractory materials due to its high hardness, electrical conductivity, high-temperature resistance, and high strength. The Mohs hardness of silicon carbide is 9.5, and the grinding ability of silicon carbide is 0.25~0.28, which is much higher than the grinding ability of corundum (about 0.01). Silicon carbide has outstanding thermal shock resistance due to its moderately low thermal expansion coefficient and high thermal conductivity. Therefore, silicon carbide is widely used to make various ceramics and refractory materials.
Adding silicon carbide to the castable refractory in a specific proportion can greatly enhance the wear resistance. The important chemical properties of silicon carbide are oxidation resistance, corrosion resistance, and wear resistance. The silicon carbide raw material used in silicon carbide castable refractory is very beneficial at high temperatures (1100°C). Especially when the silicon carbide powder is 150 mesh, it is impossible to be completely oxidized. Partial gaps occur around the SiC particles, which improves the thermal shock resistance and strength of the castable. Unoxidized SiC also acts as a particle reinforcement. The more silicon carbide content, the more beneficial it is to the anti-scaling function of refractory castables or refractory bricks. The higher the SiC content, the more conducive to the improvement of alkali resistance.
Chemical Resistance of Cast Silicon Carbide Refractories
The reason why cast silicon carbide refractory materials are widely chosen in industrial production. This is because it has strong wear resistance, high thermal conductivity, high strength, and good acid resistance, and chemical corrosion resistance. It also has the ability not to be wetted by liquid non-ferrous metals. Casting silicon carbide ceramic materials solves the problems that rare metals and other types of refractory materials cannot solve, and is cheap. It can be made into many forms. These include products with large volumes and complex shapes. In addition, the material can be accurately copied into other products. Such as bolt holes, spiral blades, and other parts.
Silicon nitride combined with silicon carbide refractory material is a special refractory material. It has superior physical and chemical properties and can be used under various extreme conditions. It can be widely used in industrial production where other ordinary refractory materials and metal products cannot meet the requirements.
Silicon nitride combined with silicon carbide refractory products can be easily installed in the nozzle of the atomized coating, and the service life is 2 to 8 times that of cemented carbide. These products accurately form the metal linings they replace, including bolt holes and blades.
Silicon nitride combined with silicon carbide refractory products surpasses all ordinary heat-resistant metal materials in terms of refractory resistance, wear resistance, corrosion resistance, and other important properties. It is better than many other refractory materials in its class.
- (1) Wear resistance. The wear resistance of silicon carbide refractory materials is excellent when used under impact, washing, and mud action. The performance of this material is usually better than that of rubber and carbide linings, and its lifespan is 3 to 30 times longer depending on the conditions of use. High service life can be expected when loosening acidic mud. For example, they are used as nozzles, water pump components, and hydrocyclone casings. The lining of pulverized coal combustion devices, etc., are just a few examples of the priority application of cast silicon carbide refractory materials.
- (2) Thermal shock resistance. Cast silicon carbide refractory materials have excellent thermal shock resistance. Because it has high thermal strength, low thermal expansion properties and high thermal conductivity (the same properties as stainless steel) at the same time. Silicon carbide refractory materials can withstand multiple rapid temperature rise and fall cycles without cracking and without affecting strength.
- (3) Resistant to chemical corrosion. The chemical corrosion resistance of cast silicon carbide refractory materials is much superior to other refractory materials and metals. This is especially true when used in strong acid environments.
Under high-temperature conditions, the chemical corrosion resistance of silicon carbide refractory materials makes it an ideal material to resist primary halogen corrosion of coal ash and most molten salts. However, oxidants such as iron oxide, aluminum oxide, chloride salts, molten sodium borate, and strong alkali may cause harmful reactions and affect the shape of silicon carbide refractory materials. Most molten non-ferrous metals cannot wet this material. There are few industrial situations where this material cannot be used.
- (1) Strength. Excellent strength at room temperature and high temperature. It can maintain its normal temperature strength even at 3000 degrees Celsius (1650 degrees Celsius). The result is a product that can be used at high temperatures. At this temperature, ordinary refractory materials and metal products cannot be used at all.
- (2) Design flexibility. Casting silicon carbide refractory materials, like metal castings, is simple to make, has precise dimensions, and precise components, and the design of complex products is not a problem. For cast silicon carbide refractory products with special requirements, the wall thickness can be cast to 6.35mm. Generally, silicon carbide refractory materials are cast to make shaped products. Because this material is very hard, it is easily processed by conventional machining.
Products made of cast silicon carbide refractory materials. For example: brazing fixtures, brakes, valve bushings, and pipeline components take advantage of the material’s excellent chemical resistance and wear resistance. Its thermal shock resistance, high strength, and excellent plasticity make it an ideal refractory material. Castable refractory products have replaced expensive exotic alloys and other types of refractory products in these applications. The cost reduction benefits also far outweigh those of other materials.
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