Synthesis WSi2 coating on W substrate by HDS method with various deposition times

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Niobium (Nb)-based alloys have been extensively used in the aerospace field owing to their excellent high-temperature mechanical properties. However, the inferior oxidation resistance severely limits the application of Nb-based alloys in a high-temperature, oxygen-enriched environment. Related scholars have extensively studied the oxidation protection of niobium alloy and pointed out that surface coating technology is ideal for solving this problem. Based on the different preparation methods of Nb-based alloys’ surface coatings, this article summarizes the relevant research of domestic and foreign scholars in the past 30 years, including the slurry sintering method (SS), suspension plasma spraying method (SPS), and halide activated pack cementation method (HAPC), etc. The growth mechanism and micromorphology of the coatings access by different preparation methods are evaluated. In addition, the advantages and disadvantages of various coating oxidation characteristics and coating preparation approaches are summarized. Finally, the coating’s oxidation behavior and failure mechanism are summarized and analyzed, aiming to provide valuable research references in related fields.

Section: Other Methodsmentioning

confidence: 99%

The Protection, Challenge, and Prospect of Anti-Oxidation Coating on the Surface of Niobium Alloy

Zhang

Cui

et al. 2021

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“…The Si element has strong stability, and Nb-Si intermetallic compound is one of the most common high-temperature structural materials. After the oxidation of Si at high temperature, the flowing SiO2 glass film is generated, which has an excellent repair and protection effect on the alloy substrate [31][32][33][34]. The phase composition of Nb-Si-based alloys mainly includes niobium solid solution (Nbss), Nb3Si, and Nb5Si3.…”

Section: Nb-si-based Alloysmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Nb-Si-Based Alloys for Ultrahigh Temperature Applications: A Comprehensive Review

Shen

et al. 2021

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Nb-Si-based superalloys are considered as the most promising high-temperature structural material to replace the Ni-based superalloys. Unfortunately, the poor oxidation resistance is still a major obstacle to the application of Nb-Si-based alloys. Alloying is a promising method to overcome this problem. In this work, the effects of Hf, Cr, Zr, B, and V on the oxidation resistance of Nb-Si-based superalloys were discussed. Furthermore, the microstructure, phase composition, and oxidation characteristics of Nb-Si series alloys were analyzed. The oxidation reaction and failure mechanism of Nb-Si-based alloys were summarized. The significance of this work is to provide some references for further research on high-temperature niobium alloys.

“…Figure 15a depicted the mass change curve per unit area of alloys with different W content oxidized at 1200 • C. It can be found that compared with the W0 alloy, the mass loss of the alloy with the addition of W was more serious, and the mass loss of the W15 alloy was the most serious, which indicated that the addition of tungsten was harmful to the antioxidation of the alloy. It was because at 1200 • C, the radioactive WO 3 generated by oxidation was unevenly dispersed in the borosilicate scale and destroyed the composition of the alloy [71][72][73], resulting in B 2 O 3 -SiO 2 film discontinuity, as being depicted in Figure 14c. The discontinuous scale could not serve as barriers to the inward spread of O 2 , so the antioxidation of W15 alloy became worse.…”

Section: Al Element Modified Mo-si-b Alloysmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Metal-Modified Mo-Si-B Alloys: A Review

Shen

et al. 2021

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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.