Cyclic oxidation testing of molybdenum protected by silicide coatings

Tuominen, S.M.; Dahl, Jon E.

doi:10.1016/0022-5088(81)90031-x

Cited by 30 publications

(6 citation statements)

References 4 publications

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“…These stresses are large enough to develop cracks since MoSi 2 has a negligible ductility below 800°C. Although the cracks may heal by reheating at a lower application temperature than the range of 650-1000°C or suitable oxide formation is required for self-healing [11].…”

Section: Thermodynamic Consideration and Mechanism Of Coatingmentioning

confidence: 99%

Development of silicide coating over molybdenum based refractory alloy and its characterization

Chakraborty

Banerjee

Sharma

et al. 2010

Journal of Nuclear Materials

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Section: Thermodynamic Consideration and Mechanism Of Coatingmentioning

confidence: 99%

Development of silicide coating over molybdenum based refractory alloy and its characterization

Chakraborty

Banerjee

Sharma

et al. 2010

Journal of Nuclear Materials

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“…MoSi 2 exhibits a self-repair characteristic through the formation of SiO 2 during its oxidation (4) . This self-repair characteristic was investigated.…”

Section: Self-repairing Tests On Precracksmentioning

confidence: 99%

“…A triple-layered TBC system has been developed to enhance the thermal cyclic performance by introducing an intermediate layer of MoSi 2 between the top ceramic coating and the bond coating in the conventional TBC system. MoSi 2 (4) has a self-repairing characteristic owing to the formation of SiO 2 within cracks. The triple-layered coating is expected to prevent the formation of TGO on the MCrAlY coating surface by preventing oxidation of the bond coating subsequently increasing the thermal cyclic resistance of the TBC.…”

Section: Introductionmentioning

confidence: 99%

Development of Thermal Barrier Coating System with Superior Thermal Cyclic Properties with an Intermediate Layer Containing MoSi<SUB>2</SUB>

Sonoya

Tobe

2009

JMMP

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The authors have developed a method of improving the thermal cyclic resistance of the thermal barrier coating system that is deposited on gas turbine components. A conventional thermal barrier coating consists of a duplex system: a top coating and a bond coating. The developed system has a protective intermediate layer of MoSi 2 which prevents oxidation of the bond coating. The conventional duplex plasma-sprayed coating was delaminated after 20 thermal cycles. On the other hand, the developed triple-layered coating system was not delaminated after 60 cycles. The reason for the enhanced resistance to thermal cycles of the developed triple-layered coating system is that the MoSi 2 layer between the top coating and the bond coating has a self-repairing property. MoSi 2 oxidizes to form SiO 2 , which seals the cracks and pores formed between the top coating and the bond coating. Thus, the formation of a thermally grown oxide(TGO), which causes the delamination of the coating, is prevented and the thermal cyclic resistance is improved.

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“…It is known to possess excellent oxidation resistance at high-temperatures due to its formation of a dense, protective SiO 2 layer on its surface that prevents further oxidation. [1][2][3][4] Additionally, it has a high melting temperature (>2000°C) and a moderate density (approximately 6.2 g cm −3 ). However, molybdenum silicide has poor machinability due to its low fracture toughness at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and electrical properties of SiC dispersed molybdenum silicide composite

et al. 2016

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In this study, a core-shell composite powder with Mo as the shell material and β-SiC as the core material was produced via chemical vapour transport caused by the hydrogen reduction of Mo oxide. Using this core-shell composite powder, a Mo silicide composite with uniformly dispersed β-SiC was fabricated by pressureless sintering at 1400°C. The relative density of specimens sintered for 10 hours was 96.1% and the electrical resistivity was 4.68 × 10 −5 Ω m. It was concluded that a β-SiC dispersed molybdenum silicide composite with enhanced electrical resistivity was successfully fabricated at a relatively low sintering temperature using the coreshell composite powder.

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Cyclic oxidation testing of molybdenum protected by silicide coatings

Cited by 30 publications

References 4 publications

Development of silicide coating over molybdenum based refractory alloy and its characterization

Development of silicide coating over molybdenum based refractory alloy and its characterization

Development of Thermal Barrier Coating System with Superior Thermal Cyclic Properties with an Intermediate Layer Containing MoSi<SUB>2</SUB>

Microstructure and electrical properties of SiC dispersed molybdenum silicide composite

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