Abstract
With the rapid development of the nuclear industry and the aerospace field, it is urgent to develop structural materials that can work in ultra-high temperature environments to replace nickel-based alloys. Mo-Si-B alloys are considered to have the most potential for new ultra-high temperature structural material and are favored by researchers. However, the medium-low temperature oxidizability of Mo-Si-B alloys limits their further application. Therefore, this study carried out extensive research and pointed out that alloying is an effective way to solve this problem. This work provided a comprehensive review for the microstructure and oxidation resistance of low silicon and high silicon Mo-Si-B alloys. Moreover, the influence of metallic elements on the microstructure, phase compositions, oxidation kinetics and behavior of Mo-Si-B alloys were also studied systematically. Finally, the modification mechanism of metallic elements was summarized in order to obtain Mo-Si-B alloys with superior oxidation performance.
Highlights
As the most commonly used blade material for aircraft engines, the nickel-based superalloy can operate normally at temperatures below 1150 ◦C
Poor oxidation resistance at mediumlow temperatures is one of the non-negligible problems [9,10,11,12]. This is because Mo-Si-B superalloys usually contain multiple phases, which exhibit different oxidation behaviors at moderate temperatures
In the low silicon Mo-Si-B alloys (i.e., Si content less than 30 at.%) that contain Moss-Mo5SiB2-Mo3Si phases, Moss can improve the fracture toughness of the alloy, but it is oxidized and forms volatile molybdenum trioxide in environment temperatures over 350 ◦C, resulting in significant weight loss of the alloy; Mo3Si metal compound contains a high content of molybdenum, which leads to poor oxidation resistance [13,14,15,16,17]
Summary
As the most commonly used blade material for aircraft engines, the nickel-based superalloy can operate normally at temperatures below 1150 ◦C. Poor oxidation resistance at mediumlow temperatures is one of the non-negligible problems [9,10,11,12] This is because Mo-Si-B superalloys usually contain multiple phases, which exhibit different oxidation behaviors at moderate temperatures. In the low silicon Mo-Si-B alloys (i.e., Si content less than 30 at.%) that contain Moss-Mo5SiB2-Mo3Si phases, Moss can improve the fracture toughness of the alloy, but it is oxidized and forms volatile molybdenum trioxide in environment temperatures over 350 ◦C, resulting in significant weight loss of the alloy; Mo3Si metal compound contains a high content of molybdenum, which leads to poor oxidation resistance [13,14,15,16,17]. The modification mechanism of the metallic elements was summarized and analyzed to ameliorate the antioxidation performance of the alloy
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