On the mechanism of high temperature oxidation of metals and alloys

Mrowec, S.

doi:10.1016/0010-938x(67)80033-7

Cited by 166 publications

(47 citation statements)

References 30 publications

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“…It is well established that Cr 3 C 2 -25(Ni20Cr) coatings (AR or NS) oxidized for prolonged periods in air at temperatures equal to or higher than 450 ºC form a surface layer of Cr 2 O 3 under a thin outer layer of NiO 66,67 . Our results showed formation of these oxides.…”

Section: The Erosion-oxidation Behavior Of the Coatingsmentioning

confidence: 99%

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

et al. 2017

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This study reports the high temperature erosion-oxidation (E-O) behavior of conventional and nanostructured Cr 3 C 2 -25(Ni-20Cr) coatings prepared by high velocity oxygen fuel (HVOF) spraying. As-received and nanostructured Cr 3 C 2 -25(Ni-20Cr) powders with mean crystallite sizes of 145 nm and 50 nm respectively, were used to prepare 120 -200 μm thick coatings on AISI 310 samples. The E-O behavior of the coatings prepared with the as-received (AR) and nanostructured (NS) powders was determined as weight change in a custom designed rig at room temperature, 450, 700 and 800 ºC. The Vickers microhardness, Young's Modulus and fracture toughness of the AR and NS coatings were determined, and the NS coatings exhibited higher values compared with the AR coatings. The E-O resistance of the NS coating was higher than that of AR coating at all temperatures, and particularly at 800 ºC. The increase in E-O resistance of the NS coatings is due to its superior mechanical properties as well as to the presence of some heterogeneities in the AR coatings. The E-O mechanisms of both types of the coatings are discussed, with special attention to that at high temperatures. The results suggest that at 800 ºC the E-O process is controlled by erosion of the oxide.

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Section: The Erosion-oxidation Behavior Of the Coatingsmentioning

confidence: 99%

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

et al. 2017

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“…Authors working with several pure metals and alloy systems propose that sulphur penetration through the oxide scale is dominated by molecular transport [4][5][6][7][8]. In this view, sulphur is transported through the oxide in the form of SO 2 molecules that travel through cracks or ''microcracks'' in the scale.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Traces of SO2 on Iron Oxidation: A Microstructural Study

et al. 2007

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Pure iron has been exposed to pure O 2 and O 2 with 100 ppm SO 2 at 525°C for 1 and 24 h. The samples were investigated by FIB, SEM, TEM, EDX and EBSD. The oxide scales formed on iron at 525°C in O 2 and in O 2 + 100 ppm SO 2 are dense and adherent and consist of three layers. The outermost layer consists of hematite. Beneath it there is a duplex-magnetite scale. The two magnetite layers are separated by a straight interface. It is concluded that the inner-magnetite layer grows inward while the outer magnetite layer grows outwards. In the presence of SO 2 the inner-magnetite layer is much thinner, iron sulphate forms at the oxide surface and discrete iron sulphide grains nucleate at the metal/oxide interface. The amount of sulphide at the metal/oxide interface increases with exposure time. The oxidation of iron in oxygen at 525°C is inhibited by 100 ppm SO 2 . The inhibitive effect of SO 2 is attributed to iron sulphate that blocks active sites on the hematite surface, slowing down the formation of oxygen ions. This explains the strong inhibition of the inward growth of magnetite by SO 2 . There is also a marked effect on the morphology of the outer oxide, producing hematite whisker growth and a less porous surface in the presence of SO 2 .

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“…The formation of a duplex structure of NiO was also observed in the oxidation of dilute nickel alloys and of pure nickel at low temperatures. 8,9 It was believed that short-circuit diffusion of oxygen was responsible for growth of the inner layer of duplex scales, and the oxygen diffusion paths are most probably microcracks induced by growth stresses. 9 The Al content was higher in the interdendritic areas.…”

Section: Discussionmentioning

confidence: 99%

Oxidation Behavior of the Single-Crystal Ni-base Superalloy DD32 in Air at 900, 1000, and 1100°C

et al. 2006

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The isothermal-oxidation behavior of the single-crystal Ni-base superalloy DD32 was studied over the temperature range from 900-1100°C and analyzed by OM, TGA, XRD, EDX, SED, and EPMA. The alloy DD32 obeyed a subparabolic rate law during oxidation at 900 and 1000°C, while the alloy showed a rather high oxidation rate at 1100°C. The severe composition segregation, which resulted from the solidification process, led to the formation of different scale on the dendritic and interdendritic regions. Internal nitride (AlN) was observed in the subsurface zone of dendritic areas, but absent in interdendritic areas. The oxidation mechanism of the alloy DD32 is discussed by comparing with other alloys.

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On the mechanism of high temperature oxidation of metals and alloys

Cited by 166 publications

References 30 publications

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

The Effect of Traces of SO2 on Iron Oxidation: A Microstructural Study

Oxidation Behavior of the Single-Crystal Ni-base Superalloy DD32 in Air at 900, 1000, and 1100°C

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