Oxidation of stoichiometric poly- and single-crystalline MoSi2 at 773K

Zhang, Fang; Zhang, Lanting; Shan, Aidang; Wu, Jinglei

doi:10.1016/j.intermet.2005.08.001

Cited by 40 publications

(22 citation statements)

References 17 publications

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“…However, other studies indicated that grain boundary itself does not provide a sharp tip needed for a crack initiation and is not the dominant site for pest oxidation [38]. Zhang et al [39] attempted to identify the individual contributions from porosity, cracking and grain boundaries on pest oxidation [39]. They compared the pest behaviors of as-cast, spark plasma sintered poly-crystalline MoSi 2 and MoSi 2 single crystal at 500 1C.…”

Section: Characterization Of Oxide Scales By Impedance Spectroscopymentioning

confidence: 99%

Role of Cr additions in enhancing wear and oxidation resistance of (Mo1−xCrx)Si2 nanocrystalline films

Munroe

et al. 2014

Ceramics International

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Section: Characterization Of Oxide Scales By Impedance Spectroscopymentioning

confidence: 99%

Role of Cr additions in enhancing wear and oxidation resistance of (Mo1−xCrx)Si2 nanocrystalline films

Munroe

et al. 2014

Ceramics International

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“…Experiments using platinum markers have shown that the protective SiO 2 layer grows exceptionally [43][44][45][46][47][48][49]. The main oxidation products are SiO 2 , MoO 3 , and sometimes MoO 2 ; oxides form mainly in pores, cracks, and other structural defects.…”

Section: High-temperature Oxidation Of Silicidesmentioning

confidence: 99%

“…Resent studies [48][49][50][51] on MoSi 2 samples obtained by different methods mostly attribute the silicide pest effect to the above structural factors: polycrystalline samples can suffer destructive oxidation at 770 K and oxidize linearly, while the oxidation kinetics of single-crystalline MoSi 2 is parabolic.…”

Section: High-temperature Oxidation Of Silicidesmentioning

confidence: 99%

High-temperature and electrochemical oxidation of transition metal silicides

Chirkin

Lavrenko

Talash

2009

Powder Metall Met Ceram

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546.281:541.138 High-temperature and electrochemical oxidation of transition metal silicides, which are widely used in microelectronics as ohmic contacts and protective coatings for high-temperature alloys, are discussed in this review. The process of oxide film formation during annealing or anodizing is extremely important for both applications of silicides. It is discussed for three disilicides: MoSi 2 , WSi 2 , and TiSi 2 . It has been shown that different types of oxide films may form on the disilicide surface depending on the thermodynamic (formation enthalpies of silicides and associated oxides) and kinetic (diffusion coefficients of silicon in silicide and oxygen diffusivity in oxide) factors: onephase (MoSi 2 ), mixed (WSi 2 ), and multilayer (TiSi 2 ) films. The "silicide pest" phenomenon is discussed in terms of thermodynamic, kinetic, and structural factors influencing the pesting. Analysis of electrochemical oxidation mechanisms for silicides in various electrolyte media reveals numerous similarities between anodic and high-temperature oxidation mechanisms. It is shown that slow silicon transport during anodic treatment at room temperature leads to the formation of multiphase mixed oxide films under electrochemical polarization.Keywords: transition metal silicides, kinetics of high-temperature oxidation, formation mechanism, protective oxide films containing SiO 2 , anodic electrochemical oxidation, electrolyte solutions.Binary refractory compounds of elements from groups 4-6 of the Periodic Table with carbon, boron, nitrogen, and silicon--carbides, borides, nitrides, silicides, and associated composites⎯are very promising materials owing to their excellent, as compared with the initial metals, high-temperature oxidation resistance and chemical stability. These materials are widely used in different engineering areas. New composite materials based on refractory compounds with desired properties constantly show up.Transition metal silicides are widely used in modern engineering. They are remarkable for their significant physical and technical properties: relatively low density, metal conductivity, high corrosion resistance, which are needed in engineering areas using high temperatures, rates, loads, and corrosive media. These are aerospace structures, high-temperature heaters, corrosion protective coatings on refractory alloys, etc. [1]. For example, the high melting temperature combined with the corrosion resistance of semiconducting silicides (Cr, Mn, and Fe disilicides) are the very properties required for thermoelectric generators that convert solar energy into electric energy.

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“…There are some claims to have solved pest oxidation (which represents a problem not only for molybdenum silicides but also for niobium silicides) either by suitable alloying [14,15] or by microstructural control [16].…”

Section: Introductionmentioning

confidence: 99%