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

Zhang, Xu; Fu, Tao; Cui, Kunkun; Shen, Fuqiang; Wang, Jie; Yu, Laihao; Mao, Haobo

doi:10.3390/coatings11070742

Cited by 25 publications

(6 citation statements)

References 80 publications

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“…In the preparation process of coating, adding an appropriate amount of beneficial components (Al, B, YSZ, ZrO 2 , Al 2 O 3 , SiC, MoB, etc.) can significantly improve the oxidation resistance and mechanical properties of the silicide coatings [44][45][46][47][48][49]. The main reaction equations involved in the above process are shown in Figure 2g.…”

Section: Microstructure and Growth Mechanism Of Hapc Coatingsmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Cui

Wang

et al. 2021

Coatings

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Mo and Mo-based alloys are important aerospace materials with excellent high temperature mechanical properties. However, their oxidation resistance is very poor at high temperature, and the formation of volatile MoO3 will lead to catastrophic oxidation failure of molybdenum alloy components. Extensive research on the poor oxidation problem has indicated that the halide activated pack cementation (HAPC) technology is an ideal method to solve the problem. In this work, the microstructure, oxide growth mechanism, oxidation characteristics, and oxidation mechanism of the HAPC coatings were summarized and analyzed. In addition, the merits and demerits of HPAC techniques are critically examined and the future scope of research in the domain is outlined.

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Section: Microstructure and Growth Mechanism Of Hapc Coatingsmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Cui

Wang

et al. 2021

Coatings

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“…It's well known that the increase of oxide layer thickness is primarily caused by the internal diffusion of O 2 [49][50][51][52], and studies have shown that alloying with active elements can effectively reduce the internal diffusion rate of O 2 [53][54][55]. For example, appropriate adding rare earth elements, on the one hand, can separate oxygen atoms at the metal-oxide interfaces and oxide scale grain boundaries and react with O 2 , thus hindering the diffusion of O 2 [56][57][58][59].…”

Section: Effects Of Rare Earth Elements On Oxidation Behaviormentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Wang

et al. 2021

Coatings

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Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even “pesting oxidation” at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. It is shown that adding rare earth elements, on the one hand, can optimize the microstructure of the alloy, thus promoting the rapid formation of protective SiO2 scale. On the other hand, it can act as a diffusion barrier by producing stable rare earth oxides or additional protective films, which significantly enhances the oxidation resistance of the alloy. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

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“…Metallic UHTMs currently under development are refractory metal (RM) intermetallic composites (ICs) (i.e., RMICs), RM high entropy alloys (RHEAs) and RM complex concentrated alloys (RC-CAs) [1,[3][4][5][6][7] (see Appendix A for abbreviations). Like the Ni-based superalloys, in an HPT the new metallic UHTMs will be part of a material system that consists of a metallic UHTM substrate plus environmental coating, most likely of the bond coat/thermally grown oxide/top coat type [2,[8][9][10][11][12][13][14][15][16][17][18][19]. A route to selecting substrate alloys and bond coat alloys for environmental coatings for metallic UHTMs was discussed in [2] and the design of bond coat alloys that form the α-Al 2 O 3 scale was discussed in [15,16].…”

Section: Introductionmentioning

confidence: 99%

On the Nb5Si3 Silicide in Metallic Ultra-High Temperature Materials

Tsakiropoulos

2023

Metals

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Refractory metal (RM) M5Si3 silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb5Si3 that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb5Si3 that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb5Si3 and Ti-rich Nb5Si3, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb5Si3 was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb5Si3 in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb5Si3. Types of alloyed Nb5Si3 with VEC and Δχ values closest to those of the unalloyed Nb5Si3 were identified in maps of alloyed Nb5Si3. Good agreement was shown between the calculated hardness and chemical composition of Nb5Si3 and experimental results.

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

Cited by 25 publications

References 80 publications

Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

On the Nb5Si3 Silicide in Metallic Ultra-High Temperature Materials

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