Abstract: MoSi2 coating is considered as one of the ideal high-temperature protective materials at present because of its good high-temperature oxidation resistance, thermal corrosion resistance, etc. However, the mismatch of thermal expansion coefficient between the coating and the substrate and interfacial interdiffusion problems seriously affect the antioxidant performance of MoSi2 coating. In this work, Nb- and W-alloyed MoSi2 coatings with different ratios were prepared on Mo substrate by arc cladding technology, and the effects of Nb and W elements on the organization, morphology, and oxidation resistance of MoSi2 coatings were investigated under high-temperature oxidizing environment. The results show that the C11b/C40-type (Mo, Nb)Si2 formed by the addition of 2%Nb increases the defects in the coating and the oxide layer, and the addition of 4%W improves the densities of the coating and the oxide layer, while the addition of 10%W adversely affects the densification of the oxide layer. According to the oxidation kinetic curves, the MoSi2 coatings with 4%W and with 2% Nb+4%W showed a trend of oxidative weight gain, and a denser oxide film was formed during the oxidation process. By correlating the oxidation kinetic curves to derive the parabolic velocity constants, it becomes evident that the oxidation rate of MoSi2 accelerates with increasing Nb and W content. The impact of adding a single element of Nb on the thickness of the MoSi2 oxide layer is minimal, whereas the synergistic alloying of Nb and W leads to a notable increase in oxide layer thickness. Oxidative activation energy calculations indicate that the MoSi2 coating with 2%Nb+4%W has the highest oxidation activation energy, which is about 2.4 times that of pure MoSi2, and has the best high-temperature antioxidant performance.
王玉瑞, 孙洪飞, 孙顺平, 王洪金, 赵凤玲, 张扬, 李小平. Nb、W合金化对电弧熔覆MoSi2涂层高温抗氧化性的影响[J]. 材料导报, 2025, 39(10): 24040229-7.
WANG Yurui, SUN Hongfei, SUN Shunping, WANG Hongjin, ZHAO Fengling, ZHANG Yang, LI Xiaoping. Effect of Nb and W Alloying by Arc Cladding on the High-temperature Oxidation Resistance of MoSi2 Coatings. Materials Reports, 2025, 39(10): 24040229-7.
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2025, Vol. 39 
