Effect of Silicide Ceramic Coatings on the High-Temperature Strength and Ductility of Niobium Alloy of the Nb – W – Mo – Zr System

Bukhanovskii, V. V.

doi:10.1023/b:msat.0000029607.97403.94

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…Similarly, the strength and ductility decreased during the tests in the initial state, after annealing and when applying a silicide-ceramic coating in the temperature range 290…2270 K in vacuum, inert medium and in air [34]. Al-Cr-Si and Al-Cr-Si-Ti coatings do not change the strength of the NCU alloy at room temperature, but reduce it at 1100 ºC [33,34].…”

Section: Problem Statusmentioning

confidence: 87%

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Heat protective coatings on niobium alloys

Babak

Lyashenko

Щепетов

et al. 2020

Mechanics and Advanced Technologies

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The article shows that during plasma-diffusion deposition, a multilayer coating was formed on the surface of the niobium alloy. A highly porous plasma-sprayed layer of molybdenum silicide has a significant spread in thickness (h=100...350 μm, Hμ20=6880 MPa). When studying the microstructure of samples with a plasma-diffusion coating after testing, it was found that cracks in the coating originate in the process of creep, mostly at the interface between the plasma and diffusion layers of the coating. The source of their origin is individual discontinuities in the diffusion layer as delivered. Crack propagation occurs both into the plasma and diffusion layers of the coating. Crack growth in the plasma layer is inhibited due to the rounded nature of the pores and the increased plasticity of this layer. The growth of cracks deep into the sample is, as a rule, inhibited by a boride sublayer. The advantage of plasma-diffusion technology provided an increased plasticity of the coating, the presence of thin barrier sublayers, a discontinuous coating structure, the presence of low-melting compounds that contribute to the healing of defects in the coating, an increase in its corrosion resistance and resistance to thermal fatigue destruction. The combination of these properties made it possible to provide an increase in durability compared to silicide and borosilicide coatings under conditions of isothermal creep in air (1400 °C, 50 MPa) 1.9...3.7 times and under conditions of thermal cyclic creep (1400-250 °C, 50 MPa) in 6.8...8.5 times. It has been determined that the use of a discrete structure will increase the thickness of the coating layer and ensure an increase in their working properties.

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Section: Problem Statusmentioning

confidence: 87%

“…The change of the main mechanical characteristics of the coated niobium alloy depending on the number of heating cycles up to 1315 °C at a pressure of 3...5 mm Hg is shown. [33].…”

Section: Problem Statusmentioning

confidence: 99%

Heat protective coatings on niobium alloys

Babak

Lyashenko

Щепетов

et al. 2020

Mechanics and Advanced Technologies

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“…Nb-W-Mo-Zr alloy, which belongs to a solid solution alloy, has better low-temperature ductility and high-temperature strength than that of the commercial C103 alloy [25][26][27][28]. This alloy also displays good welding and machining properties due to the effects of alloying elements [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

Qiao

Zheng

Guo

2019

Surface Engineering

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Silicide coatings were deposited on the Nb-5W-2.5Mo-1Zr alloy by pack cementation method. The microstructure, phase distribution, growth kinetics and oxidation behaviour of the coatings were studied. The results show that the coatings were mainly composed of an outer NbSi 2 layer, an acicular Nb 5 Si 3 -dispersed NbSi 2 two-phase layer and a Nb 5 Si 3 inner layer, exhibiting a threelayer structure. The temperature and holding time both have a significant effect on the coating formation. It was found that the coating growth kinetics at 1250°C followed a parabolic law. The coating exhibited a relatively good short-term protection to the substrate in static air at 850 and 1250°C. Both scales formed at the two oxidation temperatures consisted mainly of a mixture of SiO 2 , Nb 2 O 5 and NbO.

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“…The optimal doping content of the alloy promotes unique physicochemical and processing characteristics: high heat-resistance and low-temperature plasticity are combined with good weldability and machinability [3]. However, refractory metals and alloys on their basis cannot be used as structural materials in redox media without efficient protective coatings.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers focus on the formation and stability of coatings [1][2][3][4][5][6][7][8][9][10][11]. A silicide layer may have a significant effect on the structure and mechanical properties of material.…”

Section: Introductionmentioning

confidence: 99%

Effect of silicide coatings on the mechanical properties of alloy 5VMTs

Glushko

Широков

Shiyan

2011

Powder Metall Met Ceram

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The paper examines the effect of silicide coatings and testing media on the strength and plasticity of alloy 5VMTs between 25 and 1100°C. It is established that uncoated samples tested in argon have higher strength and plasticity over the entire temperature range of interest than coated samples tested in argon and air. The major cause of decrease in the mechanical properties of coated samples is the silicide layer whose properties depend on testing temperature.

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Effect of Silicide Ceramic Coatings on the High-Temperature Strength and Ductility of Niobium Alloy of the Nb – W – Mo – Zr System

Cited by 9 publications

References 3 publications

Heat protective coatings on niobium alloys

Heat protective coatings on niobium alloys

Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

Effect of silicide coatings on the mechanical properties of alloy 5VMTs

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