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Oxidation resistance and thermal stability of heat resistant castings
Sep 25, 2018

In the process of production, aluminum, silicon, chromium and other elements can be added to the cast iron. In this way, a dense layer of SiO2, Al2O3, CrO3 and other oxide films can be formed on the surface of the casting, which can significantly improve the antioxidant capacity at high temperature and change the base of the cast iron into single-phase ferrite.In addition, silicon and aluminum can increase the phase transition point so that the solid phase transition does not occur at the working temperature, which can reduce the volume change and microcrack.

 

Chromium in heat-resistant castings can form stable carbides and improve the thermal stability of cast iron.The commonly used heat-resisting cast iron is medium silicon cast iron, high chromium cast iron, nickel chromium silicon cast iron and so on.

 

The development of heat-resistant castings is closely related to the technical progress of power station, boiler, gas turbine, internal combustion engine and aero-engine.Different types of steel are used because of the different temperatures, stresses and environments used by various machines and devices.Heat-resistant casting means that it can be used at high temperature and its antioxidant or growth resistance meets the requirements.http://www.wuxiorient.com/


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