Microstructure and oxidation behavior of Si–MoSi 2 functionally graded coating on Mo substrate

Zhang, Yingyi; Li, Yungang; Bai, Chenguang

doi:10.1016/j.ceramint.2017.02.024

Cited by 112 publications

(42 citation statements)

References 23 publications

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“…[9] This surface passivation can be achieved by chemical modification of the samples' surface [9,15,16] or by application of coatings, which act as diffusion barrier. [28][29][30][31][32][33][34] To maintain the excellent mechanical properties of the material, most approaches favor the application of protective coatings. Among the different coating concepts, metallic Mo-Si-(B) coatings produced by chemical vapor deposition (CVD), [35] pack cementation (PC), [36][37][38][39][40] or magnetron sputtering [28] are the most prominent approaches.…”

Section: Coating Strategiesmentioning

confidence: 99%

“…Zhang et al [32] demonstrated the feasibility of the liquid siliconizing process to produce Si-MoSi 2 functionally graded coatings on Mo substrates. The substrates were inserted into the molten silicon at 1460 C for 20 min in Ar atmosphere.…”

Section: Liquid Siliconizingmentioning

confidence: 99%

“…on pure Mo substrates produced by molten salt according to Suzuki et al [31] Figure 16. Schematic drawing of Si-MoSi 2 coatings on pure Mo substrates (data from Zhang et al [32] ). Figure 17.…”

Section: Sputter Depositionmentioning

confidence: 99%

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Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

et al. 2020

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Molybdenum‐based materials offer high melting temperatures and promising mechanical properties; therefore, they are potential candidates for high‐temperature components, such as turbine blades. However, at temperatures above 700 °C, molybdenum suffers from severe pesting phenomenon, leading to decomposition of the component. Therefore, oxidation‐resistant environmental barrier coatings are crucial to prevent the material from degradation and to maintain its excellent mechanical properties at high temperatures. This review provides a detailed overview on the different coating concepts for Mo and Mo‐based alloys.

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Section: Coating Strategiesmentioning

confidence: 99%

Section: Liquid Siliconizingmentioning

confidence: 99%

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Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

et al. 2020

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“…Al2O3 and Cr2O3 have the same hexagonal crystal structure; they can form a complete substitutional solid solution (Al1-xCrx)2O3 (0 ≤ x ≤ 1) at high temperature in the whole composition range without any sign of eutectic [12,13]. The solubility of Cr2O3 in coal gasification slag (SiO2-CaO system) and various glass melts is much smaller than that of other oxide materials, so Cr2O3 or refractories containing Cr2O3 have good corrosion resistance to steel slag, non-ferrous smelting slag, coal gasification slag, oil-gas furnace slag, solid incinerator, and various glass melts [14][15][16][17][18][19][20]. However, the environment in the furnace of the smelting reduction ironmaking is very harsh with the high temperature, high oxidation degree, high FeO content, large fluctuation, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cr2O3 Content on Microstructure and Mechanical Properties of Al2O3 Matrix Composites

Cui

Zhang

et al. 2021

Coatings

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Al2O3-Cr2O3 refractories are completely substitution solid solutions and can effectively resist slag erosion when used as an industrial furnace lining. In order to provide suitable chromium corundum refractory with excellent slag resistance and mechanical properties for smelting reduction ironmaking, Al2O3-Cr2O3 samples with different mass percentages (0, 10, 20, 30, 40 wt.%) of Cr2O3 were prepared by a normal pressure sintering process to study its sintering properties, mechanical properties, thermal shock resistance, and microstructure. The results of densification behavior showed that the introduction of Cr2O3 deteriorates the compactness, the relative density and volume shrinkage rate of the composite material decrease with the increase of the Cr2O3 content, and the apparent porosity increases accordingly. In terms of mechanical properties, the hardness, compressive strength, and flexural strength of Al2O3-Cr2O3 material decrease gradually with the increase of Cr2O3. After 10 and 20 thermal shock cycles, the flexural strengths of the samples all decreased. With the increase of Cr2O3 in these samples, the loss rate of flexural strength gradually increased. Considering the slag resistance and mechanical properties of the composite material, the Al2O3-Cr2O3 composite refractory with Cr2O3 content of 20–30% can meet the requirements of smelting reduction iron making kiln lining.

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“…。 MoSi 2 在 1900 ℃以下时, 以 C11 b 型体心正方晶体稳定存在, 晶体结构中兼有金属键和共价键, 表现出金属和陶瓷双重特征, 具有类似金属的良好的电导率和热导率(52 W/(mK))及类似陶瓷的抗氧化性能 [6] , 是一种典型的电热陶瓷材料 [7] 。然而, MoSi 2 在 400~600 ℃之间会发生"pesting"现象, 表现为材料的急剧氧化而成粉末状 [8][9] 。研究表明 [10][11] [10,[14][15] 。然后由于快速冷却, 部分六方相来不及重新转变为四方相从而被保留下来 [10] [8][9] , MoSi 2 在 400~600 ℃之间会发生"pesting"现象, 主要发生以下反应 [18] [22] , 会进一步促进裂纹的产生。图 8 MoSi 2 -30Al 2 O 3 加热辊循环加热的 t-T 曲线 Fig. 8 Cyclic heating t-T curve of MoSi 2 -30Al 2 O 3 heating roller 图 9 涂层电阻率与加热时间的变化关系 Fig.…”

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Microstructure and Property of MoSi2-30Al2O3 Electrothermal Coating Prepared by Atmospheric Plasma Spraying

Zhou¹,

Liu²,

Yang³

et al. 2019

Journal of Inorganic Materials

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With MoSi 2-30Al 2 O 3 mixed powders as the raw material, MoSi 2-30Al 2 O 3 electrothermal coating was sprayed by atmospheric plasma spraying technology. The phase composition, microstructure and thermal stability of the coating were systematically studied by XRD, SEM, electrical test and differential thermal gravity analysis. The results show that MoSi 2-30Al 2 O 3 electrothermal coating shows dense microstructure. Al 2 O 3 can improve the electrical resistivity and oxidation resistance of MoSi 2 materials in low temperature. The coating exhibits an excellent electrical-heating performance. In the heating cycle test, it could be heated to 320 ℃ stably and exhibit uniform thermal distribution in the surface area. The temperature variation in roll's central area can be controlled within 25 ℃; Oxidation and thermal stress relaxation during heating cycle would generate cracks and pores in the coating which would increase electrical resistivity.

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Microstructure and oxidation behavior of Si–MoSi 2 functionally graded coating on Mo substrate

Cited by 112 publications

References 23 publications

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review

Effects of Cr2O3 Content on Microstructure and Mechanical Properties of Al2O3 Matrix Composites

Microstructure and Property of MoSi2-30Al2O3 Electrothermal Coating Prepared by Atmospheric Plasma Spraying

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