Micro-analysis of high-temperature oxidation-resistance of a new kind of heat-resistant grid plate in grate-kiln

Jun-you Liu1), Feng Li1), Jie Liu2), Yi Zhang1), and Yu-lei Wang1) 1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing BKDR Metallurgy Engineering & Technology Co. Ltd., Beijing 100083, China

摘 要：To further improve the oxidation-resistance of materials and reduce the cost of grid plates in grate-kiln, a new kind of heat-resistant grid plate was developed. The microstructure of this grid plate with a life more than 18 months was studied by XRD, SEM and EDS techniques. The results show that high hardness, high intensity and good impact property make the new kind of heat-resistant grid plate and its oxide film have a higher resistance to deformation and abrasion at 900-1000°C. Besides, small grain size is beneficial to form a complete protective oxide film. The oxide film composed of SiO2 layer, Cr2O3 layer and Fe2O3 layer is rather thin and bonds closely with the backing. The forming of the chemical stable nickel-rich layer increases the density of Cr2O3 layer.

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