Engineering limitations of MoSi2 coatings

Kircher, Thomas A.; Courtright, E.L.

doi:10.1016/0921-5093(92)90313-p

Cited by 95 publications

(27 citation statements)

References 13 publications

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“…In previous studies (Ref 5), grain boundaries, defects such as pores and cracks have been considered important factors influencing the pest oxidation of MoSi 2 . Wang et al (Ref 13) found that the network microstructure of oxides was formed along the edges of grain boundaries of the MoSi 2 matrix.…”

Section: Oxidation Behavior Of the Coatings At 500°cmentioning

confidence: 99%

Oxidation Behavior of ZrO2 Reinforced MoSi2 Composite Coatings Fabricated by Vacuum Plasma Spraying Technology

et al. 2010

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In this work, MoSi 2 , MoSi 2 -20 vol.% ZrO 2 , MoSi 2 -40 vol.% ZrO 2 (denoted, respectively, as MZ0, MZ2, and MZ4) coatings were fabricated by vacuum plasma spraying technology. The oxidation behavior of the coatings was examined at 500, 1200, and 1500°C, respectively. Some basic properties of the coatings, including microhardness, porosity, and surface roughness were characterized. The tests at 500°C showed that the pest oxidation phenomenon of MoSi 2 coatings was restrained by the addition of ZrO 2 . The MZ2 coating exhibited excellent oxidation-resistant behavior both at 1200 and 1500°C. However, the MZ4 coating presented the impaired oxidation-resistant behavior at 1500°C, though the comparable oxidation property at 1200°C was still obtained.

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Section: Oxidation Behavior Of the Coatings At 500°cmentioning

confidence: 99%

Oxidation Behavior of ZrO2 Reinforced MoSi2 Composite Coatings Fabricated by Vacuum Plasma Spraying Technology

et al. 2010

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“…Therefore, research of the hightemperature oxidation resistant coating of molybdenumbased alloys is becoming more and more important. Molybdenum disilicide (MoSi 2 ) has attractive properties like high melting point (2,303 K), relatively low density (6.24 gÁcm -3 ), excellent resistance to elevated temperature oxidation, high thermal conductivity, and electric conductivity (thermal resistivity = 25 WÁm -1 ÁK -1 and electric resistivity = 21.6 9 10 -6 XÁcm), it is considered to be the most suitable high-temperature coating material for the engineering application [6,7]. Also, MoSi 2 is a promising material against oxidation at temperatures beyond 1,473 K due to the formation of a protective, glassy silica (SiO 2 ) layer on the surface [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and phase transformation behavior of Mo–MoSi2 gradient material

Yonghong

Shi

2014

Rare Met.

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Mo-MoSi 2 gradient coating on Mo substrate was prepared by siliconizing process, using the polysilicon as silicon atoms. The gradient layer was analyzed by the experimental results, theoretical analysis, and thermodynamic calculation. The silicon, molybdenum content of gradient coating shows a gradual change regulation. The reaction between silicon and molybdenum is most likely to generate Mo 5 Si 3 , then MoSi 2 , finally Mo 3 Si, but when the silicon content is excessive, the Mo 5 Si 3 and Mo 3 Si will react with silicon and generate MoSi 2 . The gradient layer is mainly constituted by Si and MoSi 2 , only about 1/10 gradient layer is constituted by Mo 5 Si 3 and Mo 3 Si, and the stable existences of Mo 5 Si 3 and Mo 3 Si are mainly determined by the silicon content. Along the Mo substrate to the surface of the coating, the phase composition of gradient coating changes as follows: Mo ? transition layer, Mo (main phase) ? Mo 3 Si ? Mo 5 Si 3 ? intermediate layer, and MoSi 2 (main phase) ? Mo 5 Si 3 ? Si ? surface layer MoSi 2 (main phase) ? Si, and the experimental temperature has no effect on phase composition of gradient coating.

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“…Future high-temperature structural applications will require materials with increasing performances. This is the reason why intermetallics, [1][2][3][4] ceramics, 5) carbon composites, [6][7][8] and refractory metals 9,10) are candidates for replacing the current Ni-base superalloys. Silicide becomes one of the above candidates, because it has high strength and can form a protective SiO 2 scale at very high temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Boron-Added WSi<SUB>2</SUB> Compact

et al. 2008

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In order to improve the oxidation resistance of WSi 2 at 873-1473 K, B added WSi 2 was fabricated by a spark plasma sintering method and oxidation tests were carried out in air. The fabricated B added WSi 2 consists of WSi 2 , Si and W 2 B 5 . The addition of B into WSi 2 leads to the formation of a protective borosilicate scale, resulting in improvement of the oxidation resistance. Requisite concentration of B for the formation of a protective borosilicate scale decreases as the temperature is raised. Consequently, the addition of 2 or 3 mass% B is the most effective for improvement of the oxidation resistance of WSi 2 in the temperature range of 873-1473 K. Such effect of B on high-temperature oxidation of WSi 2 is also discussed.

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Engineering limitations of MoSi2 coatings

Cited by 95 publications

References 13 publications

Oxidation Behavior of ZrO2 Reinforced MoSi2 Composite Coatings Fabricated by Vacuum Plasma Spraying Technology

Oxidation Behavior of ZrO2 Reinforced MoSi2 Composite Coatings Fabricated by Vacuum Plasma Spraying Technology

Microstructure and phase transformation behavior of Mo–MoSi2 gradient material

Microstructure and Oxidation Behavior of Boron-Added WSi<SUB>2</SUB> Compact

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