The casting method in which pouring, solidification, and extraction are all done continuously from an open-end mold is known as continuous casting. There are two types of this casting, vertical and horizontal. Graphite continuous casting die mold is widely popular because graphite is commonly used in this type of casting. Graphite dies are used in both vertical and horizontal methods. Extruded graphite can be used for vertical casting of large ingots, but mostly molds are fabricated from isostatically pressed graphite.
Mold should have poor adhesive qualities in order to avoid sticking and breaking of casting when extracted. The low wetting of the graphite continuous casting mold allows a smooth extraction. Mostly alloys and molten non-ferrous metals fail to wet graphite.
Cooling down and solidification of cast metal liberates heat which needs to be removed from the mold. The value of the heat in a time unit transferred through the mold regulates the solidification and extraction speed of the casting. It implies that the thermal conductivity of the mold should be enough to support the fast heat removing. That is the reason for using graphite molds because it has higher thermal conductivity.
Casting mold is heated from the inside when molten metal entered in it and it is cooled down from outside by water-cooled copper jacket or directly water. It results in the non-uniform temperature distribution, and low thermal expansion of the mold can help prevent the distortion. Thermal expansion of graphite is lower than the metal like steel and aluminium.
It is self-lubricant as graphite is a solid lubricant. It prevents cracks, and the thickness of the defective periferial skin is minimised. The mechanical strength of the material also gets better with increasing heat. It is also an easily machined material which provides beautiful inner mold finish and good quality outer surface.
The properties of graphite make graphite heaters function efficiently. Graphite heating systems make sure that there is a precise power input to every zone of the susceptor. They are considered ideal for CVD, CVI, and Carbon-Carbon Composite application. During every cycle of power distribution overall power level and the amount of time power is switched varyingly to a specific zone of the coil. It helps increase yields of product.
High thermal conductivity and low coefficient of thermal expansion are striking characteristics of the graphite heater. It can withstand extreme working conditions due to the high thermal stability. These features of the heater make it a top choice in special industrial furnaces.
Graphite materials are commonly used in industries like chemical refining and processing, petrochemical, fertiliser, mining, metal finishing, pharmaceutical, steel pickling, and food and beverage. This material is used in the industries since the beginning, and it has never failed its purpose.