The oxidation of nickel—tungsten alloys

El-Dahshan, M.E.; Whittle, D. P.; Stringer, J.

doi:10.1016/0010-938x(76)90033-0

Cited by 28 publications

(10 citation statements)

References 6 publications

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“…However, some reports indicate that these elements can stabilize the Cr 2 O 3 layer [18,19]. The effects of Mo and W have been explained as promoting or hindering the formation of Cr 2 O 3 or Al 2 O 3 , as well as the volatilization of their oxides [20,21,22,23,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys

et al. 2019

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The oxidation behavior of Ni–9.5Co–(8~12)Cr–(2.5~5.5)Mo–(4~8)W–3Al–5Ti–3Ta–0.1C–0.01B alloys was investigated at 850 °C and 1000 °C The mass change, the phase of oxides, and the cross-sectional structure of specimens were analyzed after cyclic oxidation tests. The oxide scale was composed mainly of Cr2O3 and NiCr2O4, but NiO, TiO2, and CrTaO4 were also found. Al2O3 was formed beneath the Cr oxide layer. The Cr oxide layer and internal Al oxide acted as barriers to oxidation at 850 °C, while Al oxide was predominantly protective at 1000 °C. Cr increased the mass gain after oxidation test at both temperatures. Mo increased the oxidation rate at 850 °C but decreased the oxidation rate at 1000 °C. W slightly increased the mass gain at 850 °C but did not produce a significant effect at 1000 °C. The effects of Cr, Mo, W, and the temperature were discussed as well as the volatilization of oxides, the valence number of elements, and diffusion retardation.

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Section: Introductionmentioning

confidence: 99%

Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys

et al. 2019

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“…Mo forms volatile oxide in air. Further, it retards formation of Cr 2 O 3 and increases possibility of oxide spallation [10,11]. It is noted that the above research results The coefficient for W is very small and its value is large (Table 2), and the slope of mass gain versus W content in the main effect plot (Figure 3(a)) is very low.…”

Section: Discussionmentioning

confidence: 68%

“…Figure 3(b) shows that the beneficial effect of Cr strongly stands out only in the alloys without W. The Cr 2 O 3 might be weak because the temperature in this study is close to the temperature by which Cr oxide becomes volatile. In addition, it is known that W inhibits formation of Cr 2 O 3 layer [10,11]. Figure 3 shows that Mo slightly increased oxidation rate.…”

Section: Discussionmentioning

confidence: 98%

“…However, excessive alloying of Cr and Al in superalloys causes degradation of mechanical properties [8]. Mo and W can increase high temperature strength of the superalloys but they have been known to lower the oxidation resistance [10][11][12][13][14]. Nevertheless, some recent researches suggested that Mo facilitates growth of continuous Cr 2 O 3 layer by lowering oxygen activity on the surface of Ni-Mo-Cr alloys [15] and W suppresses volatilization of Cr oxide from Ni-Cr-W alloys at a high temperature over 1100 ∘ C [16].…”

Section: Introductionmentioning

confidence: 99%

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Statistical Study of the Effects of the Composition on the Oxidation Resistance of Ni‐Based Superalloys

Park

Seo

Yoo

et al. 2015

Journal of Nanomaterials

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The effects of alloying elements (Co, Cr, Mo, W, Al, Ti, and Ta) on the oxidation resistance of Ni-based superalloys are studied using the Response Surface Methodology (RSM). The statistical analysis showed that Al and Ta generally improve the oxidation resistance of the alloy, whereas Ti and Mo degrade the oxidation resistance. Co, Cr, and W did not alter oxidation rate significantly when examined by the mass gain averaged for all model alloys. However, it is remarkable that the degree of the effects of alloying elements varied with the concentration of other elements. Further, the effect of each element was sometimes found to be reversed for alloy groups specified by the concentration of another element.

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“…The oxidation of Ni-W alloys has been studied by many groups. [3][4][5][6][7] Various alloy compositions were investigated, including compositions identical to those used in the RABiTS process, as well as the RABiTS tapes themselves. The most important result of these studies was the development of the surface-oxidation epitaxy technique (SOE), which allowed growing the NiO layer epitaxially on the Ni-W surface with good (001) orientation.…”

Section: Introductionmentioning

confidence: 99%

Revealing the mechanism of the early stages of Ni–W RABiTS oxidation

et al. 2010

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The early stages of surface oxidation of biaxially textured Ni-W tapes were studied using thermodynamic calculations along with experimental tape oxidation at low P(O 2 ). Tape phase and chemical composition, surface morphology, and roughness were examined using x-ray diffraction (XRD), energy-dispersive x-ray analysis (EDX), secondary ion mass spectroscopy (SIMS), x-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). For a Ni 0.95 W 0.05 alloy tape, the precise position of the tape oxidation line in P(O 2 )-T coordinates was established. This line includes a break at T % 650 C that originates from the change of the W oxidation mechanism from internal oxidation to oxidation on a free surface accompanied by segregation of the alloy components in the tape near-surface region. The surface roughness of a polished tape increased drastically during internal oxidation of W; further tape oxidation did not affect the integral roughness parameters, but introduced numerous small ($100 nm) features on the tape surface comprising NiO precipitates.

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The oxidation of nickel—tungsten alloys

Cited by 28 publications

References 6 publications

Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys

Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys

Statistical Study of the Effects of the Composition on the Oxidation Resistance of Ni‐Based Superalloys

Revealing the mechanism of the early stages of Ni–W RABiTS oxidation

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