The use of chromium ore in castables has many significant advantages, which make chromium ore an indispensable and important raw material in the field of high-temperature industry, especially in casting and refractory manufacturing. The following are the main advantages of chromium ore in castables:
1. Excellent slag resistance: chromium ore has excellent resistance to alkaline slag erosion and does not react chemically with slag such as iron oxide. This feature allows the castable to remain stable under the action of high-temperature molten metal and slag, effectively preventing thermochemical sticking sand and slag penetration.
2. Good thermal stability: chromium ore has a high melting point and sintering temperature. At high temperatures, chromium ore is not prone to cracking or burning, ensuring the integrity and performance stability of the castable.
3. Low thermal expansion coefficient: chromium ore has a low thermal expansion coefficient, and its volume changes little when the temperature rises, and it is not easy to deform. It helps to reduce the thermal stress of the castable at high temperatures, reduce the risk of cracking, and improve the thermal shock resistance of the castable.
Chromium ore sand
4. High thermal conductivity: The thermal conductivity of chromium ore sand is several times higher than that of traditional refractory materials such as silica sand, and it can quickly conduct heat from the inside of the castable to the outside. This feature helps to increase the cooling rate of the casting, achieve directional solidification, reduce the generation of thermal cracks, and improve production efficiency.
5. Solid-phase sintering characteristics: During the casting process of molten metal, solid-phase sintering will occur on the surface of chromium ore sand to form a dense sintering layer. This feature can effectively prevent the penetration of molten metal, avoid mechanical sand sticking, and improve the surface quality of castings.
6. Excellent corrosion resistance: Chromium ore sand has excellent corrosion resistance and can withstand erosion by various solutions such as water, acid, and alkali. This feature enables the castable to maintain stable performance in a complex working environment and extend its service life.
7. High compressive strength and bonding strength: Chromium ore sand has high compressive strength and good bonding properties, and can withstand high pressure and low pressure shocks from molding sand. At the same time, the chromium ore sand particles are round in shape without sharp corners and have good adhesion with the resin binder, which helps to ensure the molding quality and stability of the castable.
