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  • oxidation  (5)
  • Springer  (5)
  • Oxford University Press
  • 1980-1984  (5)
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Keywords
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  • Springer  (5)
  • Oxford University Press
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of directionally solidified Ni-Al-Cr3C2 eutectic (1980)
    Springer
    Oxidation of metals 14 (1980), S. 31-45 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; directionally solidified eutectic alloy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The isothermal oxidation behavior of a directionally solidified Ni-Al-Cr3C2 eutectic alloy in flowing air at 1100° C has been studied using various physical techniques. Initially, the alloy oxidizes relatively slowly as a protective α- Al2O3 layer develops on its surface. However, this layer breaks down mechanically at temperature, enabling a more rapidly growing Cr2O3 -rich scale to develop, the carbide fibers supplying chromium for the oxidation process. The extent of oxidation is further increased by the development of substantial amounts of internal oxide in the alloy beneath this scale, with some preferential oxidation down the alloy-carbide fiber interfaces. The influence of carbide fiber orientation on the oxidation behavior is considered and discussed in relation to proposed oxidation mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604102
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of yttrium additions on the oxidation resistance of a directionally solidified Ni-Al-Cr3C2 eutectic alloy (1980)
    Springer
    Oxidation of metals 14 (1980), S. 135-146 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; yttrium additions ; directionally solidified eutectic alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Isothermal oxidation of a directionally solidified Ni-Al-Cr3C2 eutectic alloy results in development of an external α-Al3O3-rich scale. However, this scale breaks down after relatively short times at temperature and a less protective Cr2O3-rich scale is formed, together with substantial internal oxide in the alloy. In an attempt to maintain the external α-Al2O3-rich scale and prevent damaging subscale oxidation, modified yttrium-containing directionally solidified alloys have been developed. The oxidation resistance of these alloys at 1000 and 1100°C in flowing air has been investigated and found to be considerably better than that of the corresponding yttrium-free alloy. At both temperatures an external α-Al2O3-rich scale is produced and is retained for much longer periods than on the yttrium-free alloys during isothermal and thermal cycling oxidation. Some scale breakdown does occur during thermal cycling at 1100°C, but α-Al2O3 is able to re-form as the surface oxide. However, although external α-Al2O3-rich scales are retained for long periods on these alloys, some oxide penetration into the alloy beneath these scales does occur where coarse carbide fibers intersect the alloy surface. This is associated with relatively poor scale integrity at these intersections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603990
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidation and hot corrosion of coated and bare oxide dispersion strengthened superalloy MA-755E (1981)
    Springer
    Oxidation of metals 15 (1981), S. 251-276 
    Details
    ISSN: 1573-4889
    Keywords: oxide dispersion strengthening ; oxidation ; hot corrosion ; powder metallurgy ; porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cyclic hot corrosion and oxidation testing of an experimental oxide dispersion strengthened (ODS) superalloy MA-755E were conducted in a hot gas stream at Mach 0.3. The response of the ODS alloy, bare or with protective coatings, was similar to that of a conventional cast alloy, IN-792, in hot corrosion at 900°C. However, during oxidation at 1100 and 1150°C the ODS alloy differed from the cast alloy by developing a greater amount of subsurface porosity. Compared with a diffused aluminide coating, an electron beam vapor deposited NiCrAlY coating offered superior oxidation protection and decreased porosity formation. In additional testing, the tendency to form porosity was associated with the large grains of recrystallized powder metallurgy alloys but was independent of the presence of an oxide dispersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058828
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  • 4
    Electronic Resource
    Electronic Resource
    Platinum and the oxidation behavior of a nickel based superalloy (1984)
    Springer
    Oxidation of metals 22 (1984), S. 201-226 
    Details
    ISSN: 1573-4889
    Keywords: platinum ; nickel-based superalloy ; oxidation ; RJM2012, IN792+Hf
    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 behavior in air of a platinum containing nickel based superalloy (RJM2012) is compared with that of a similar alloy (IN792+Hf) without platinum. The distinct improvement in the oxidation resistance of the platinum containing alloy at high temperatures (1100°C) is explained in terms of the oxide morphologies and oxidation kinetics. In particular, it appears that platinum has a small but significant effect on the diffusion of other species in the alloy, and a model is presented to account for the complex sequence of oxide development, which culminates in the formation of a protective alumina scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656576
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics and mechanisms of the oxidation of cobalt at 600–800°C (1982)
    Springer
    Oxidation of metals 17 (1982), S. 55-76 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; cobalt ; diffusion ; grain boundaries ; Co3O4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two-phase layered scales comprising CoO and Co 3O4 formed on cobalt during oxidation at 600°, 700°, and 800°C and at oxygen partial pressures in the range 0.001–1 atm. The kinetics, which were obtained by thermogravimetric analysis, obeyed a parabolic rate law after an initial, non-parabolic stage of oxidation. The monoxide consisted of relatively large grains (∼10 μ) and the spinel comprised small grains (⪝3 μ) for all conditions of oxidation. Grain boundary diffusion of cations played a significant role in the growth of the spinel layer. Thermogravimetric data and the steady-state ratio of the oxide layer thicknesses were employed to calculate the rates of thickening of the individual oxide layers and the rate of oxidation of CoO to Co3O4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606193
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