Abstract
Molybdenum and its alloys, with high melting points, excellent corrosion resistance and high temperature creep resistance, are a vital high-temperature structural material. However, the poor oxidation resistance at high temperatures is a major barrier to their application. This work provides a summary of surface modification techniques for Mo and its alloys under high-temperature aerobic conditions of nearly half a century, including slurry sintering technology, plasma spraying technology, chemical vapor deposition technology, and liquid phase deposition technology. The microstructure and oxidation behavior of various coatings were analyzed. The advantages and disadvantages of various processes were compared, and the key measures to improve oxidation resistance of coatings were also outlined. The future research direction in this field is set out.
Highlights
Yu, L.; Cui, K.; Wang, J.; Zhang, X.With the rapid development of aerospace, national defense and the military industry, electronics, and so on, increasing attention has been paid to the research and application of refractory metals [1,2,3,4]
It can been seen that the Ti, Zr, W, Re, Si, B, Hf, C and rare earth oxides are often added to pure Mo as beneficial elements to prepare molybdenum alloys
A smooth and dense SiO2 protective film forms on the coating surface when the oxidation temperature is 1600 ◦ C, as shown in Figure 18d [89]. This is due to the good fluidity of SiO2 at high temperature, which can fill the defects on the coating surface [90]
Summary
The alloying and surface-coating technology are the main methods to increase the oxidation resistance of the basal materials [15,16]. Mo–Ti–Si–B alloys are considered as a promising ultra-high temperature material Their oxidation resistance and mechanical properties need to be further studied [24]. The surface-coating technology can improve the oxidation resistance of the alloy at high temperature with as little impact on the mechanical properties as possible. It is favored by the majority of researchers [25]. The future research and development direction in this field will be outlined
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