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  • 1
    Electronic Resource
    Electronic Resource
    Kinetics of high-temperature oxidation of boron carbide in oxygen (1976)
    Springer
    Oxidation of metals 10 (1976), S. 85-95 
    Details
    ISSN: 1573-4889
    Keywords: boron carbide ; oxidation ; kinetics ; chromatography method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermogravimetry and gas-adsorption chromatography were used to study the kinetics of formation of solid and gaseous products during the hightemperature oxidation of compact boron carbide in oxygen at 740 Torr. Oxidation resistance was observed at temperatures up to 1200°C. The main oxidation products were B2O3 and CO2. Oxidation was paralinear; the carbon consumption exceeded the consumption of boron as compared to the ratio of these elements in the compound B4C. This difference resulted in carbon depletion of the carbide layer in the substrate near the scale〉.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614238
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  • 2
    Electronic Resource
    Electronic Resource
    High temperature oxidation of silicon carbide based materials (1987)
    Springer
    Oxidation of metals 27 (1987), S. 83-93 
    Details
    ISSN: 1573-4889
    Keywords: silicon carbide ; oxidation ; constructional ceramics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The process of high temperature oxidation of two silicon carbide based materials differing by methods of their production and properties has been studied up to 1500°C in air. The oxidation was performed under the isothermal conditions and at the programmed heat rate of 10° per minute. It was found that the oxidation resistance of the material was the function of the presence of extrinsic metals having close affinity for oxygen. It was also found that under heating up to 1500°C in air phase transitions occurred in the SiC surface layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656732
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of oxidation on the composition and structure of the surface layer of hot-pressed boron carbide (1988)
    Springer
    Oxidation of metals 29 (1988), S. 193-202 
    Details
    ISSN: 1573-4889
    Keywords: Oxidation ; structural ceramics ; boron carbide ; strength ; critical stress-intensity factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of hot-pressed boron carbide under isothermal conditions and under conditions of programmed heating up to 1500°C was investigated. Oxidized samples were studied by secondary-ion mass spectrometry, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray microanalysis, X-ray diffraction, and other methods. It has been demonstrated that oxidation starts above 600°C and results in the formation of a thin transparent B2O3 film that is cracked after cooling. Up to 1200°C, the oxidation process is limited by the diffusion of reagents through the oxide layer; at higher temperatures, it is determined by the rate of chemical reaction of carbide with oxygen in the air. During boron carbide oxidation the etching of grain boundaries occurs, it results in strength degradation at higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00751794
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  • 4
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of zirconium-hydride powders (1992)
    Springer
    Oxidation of metals 38 (1992), S. 89-98 
    Details
    ISSN: 1573-4889
    Keywords: kinetics ; oxidation ; zirconium hydride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics of zirconium-hydride powders were studied in the temperature range of 298–1378 in air at atmospheric pressure. TG, DTA, DSC, x-ray analysis, and scanning electron microscopy were used. The results obtained are in accordance with the proposed pseudo-parabolic model of zirconium-hydride oxidation. This model includes the initial linear mode of oxide growth with oxygen diffusion through a non-solid film of ZrO2 of variable depth and a stationary diffusion process followed by oxide sintering. It has been established that the activation energy of the limiting stage of oxidation (238.3 kJ/mol) coincides with the activation energy of oxygen self-diffusion in monocline ZrO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665046
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of high-temperature oxidation of lanthanum hexaboride in oxygen and the effect of internal oxidation on the protective properties of the scale (1973)
    Springer
    Oxidation of metals 7 (1973), S. 131-139 
    Details
    ISSN: 1573-4889
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The vacuum microbalance method, as well as petrographic and x-ray phase analysis were employed to investigate the oxidation of lanthanum hexaboride as a function of temperature (700–1200°C), oxygen pressure (0.1–740 Torr) and porosity of the sample. It has been established that LaB6 is highly resistant to oxidation in oxygen up to a temperature of 1200°C. The protective properties of the scale are determined by the peculiarities of the process of internal oxidation, during which a lower lanthanum boride, LaB4, was observed to be enveloped by the vitreous oxide phase, B2O3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611452
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  • 6
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of titanium carbide in oxygen (1975)
    Springer
    Oxidation of metals 9 (1975), S. 171-179 
    Details
    ISSN: 1573-4889
    Keywords: titanium carbide ; rutile ; oxicarbides ; oxidation mechanism ; scale morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of titanium carbide oxidation in oxygen over the temperature range of 600–1200°C and oxygen pressure from 0.1 to 740 Torr have been studied with a vacuum microbalance. Layer-by-layer x-ray analysis, petrography, metallography, and gas chromatography have been used to analyze the oxidation products. A paralinear nature of the oxidation of material was established, and the rate constants of the process were calculated for the corresponding parabolic and linear portions of the kinetic curves. It was shown that a gaseous product, CO2, formed, as well as a solid product, TiO2 (rutile), both stoichiometric and nonstoichiometric. The lower oxides, Ti3O5, Ti2O3, TiO, were noted in the scale at temperatures from 700 to 800° and low oxygen pressures, their relative quantity rising with decreasing pressure. Based on x-ray analysis and microhardness measurements, it was concluded that titanium oxicarbides formed in the TiC, directly adjacent to the scale. A possible oxidation mechanism of titanium carbide is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613231
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of Fine-Dispersion Silicon Nitride and Oxinitride Powders Manufactured by Titanium–Magnesium Production Waste Nitriding (1999)
    Springer
    Journal of materials synthesis and processing 7 (1999), S. 151-157 
    Details
    ISSN: 1573-4870
    Keywords: Titanium–magnesium production waste ; nitriding ; silicon nitride powder ; oxinitride powder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The nitriding of titanium–magnesium production waste containing chlorine was studied using X-ray, IR, EPR, and EPMA techniques as well as chemical and mass spectrometry analyses. It was established that the high-dispersion system, consisting mainly of silicon nitride and oxinitride, formed in the temperature range of 1273–1673 K. The complex defective structure of initial silicon particles and their size determine the mechanism of nitriding and phase composition of the product formed. The base of this mechanism is the formation of free Si— and Si— bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021865112564
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  • 8
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of SiC in a glow-discharge oxygen plasma (1976)
    Springer
    Oxidation of metals 10 (1976), S. 97-103 
    Details
    ISSN: 1573-4889
    Keywords: silicon carbide ; oxidation ; molecular oxygen ; glow-discharge oxygen plasma ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics and structure of the oxide scales formed on high-density SiC were studied in molecular oxygen at 740 Torr and in a glow-discharge oxygen plasma at 0.1 Torr at temperatures of 1000, 1100, and 1200°C. The monatomic oxygen formed by the glow discharge markedly increased the reaction rate and the vaporization of some of the oxidation products. The marked differences in kinetics suggest that the rate-controlling step during oxidation in molecular oxygen is the dissociation of adsorbed diatomic oxygen to the monatomic species. Films formed in molecular oxygen were mostly amorphous SiO2 with small inclusions of SiC and graphite, whereas films formed in dissociated oxygen were primarily amorphous SiO2 containing SiO, S2O3, and the coesite form of SiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614239
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  • 9
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of titanium diboride of different purity (1994)
    Springer
    Oxidation of metals 42 (1994), S. 145-161 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; titanium diboride ; rutile ; impurities ; scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxidation in air of TiB2 powders of two different types in the temperature range from 100 to 900°C as well as of compact samples produced from them (at 600–1200°C) was studied by DTA, thermogravimetry, X-ray analysis, AES, EPMA, and SEM methods. The admixture elements in powders were found to prevent oxygen from enriching the diboride surface. In compact TiB2 samples impurities form diffusion barriers during oxidation at the matrix/scale and scale/gas interfaces as well as facilitate sintering of the scale being formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061928
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of purity on high-temperature oxidation of zirconium (1994)
    Springer
    Oxidation of metals 42 (1994), S. 223-237 
    Details
    ISSN: 1573-4889
    Keywords: kinetics ; scale ; oxidation ; zirconium ; purity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics of zirconium of different purities were studied over the temperature range of 600–1300°C (α- and β-phases). The structure of the oxidized specimens was examined. TGA, XRD, EPMA, SEM, metallographic analysis, and microhardness measurements were carried out. Impurity elements were found to increase the oxidation rate of technical zirconium. The mechanism of the effect of impurity elements on zirconium oxidation was shown to differ for the α- and β-phases. Activation energies were calculated for the parabolic and linear stages of oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052024
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