Kinetics of High Temperature Oxidation and Chromia Volatilization for a Binary Ni–Cr Alloy

Berthod, Patrice

doi:10.1007/s11085-005-6562-8

Cited by 148 publications

(96 citation statements)

References 7 publications

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“…5-10 and 12) are similar to those detected in dense Ni-Cr alloys of similar Cr content after oxidation [27]. Formation of Cr 2 O 3 it is not capable of impeding oxidation of Ni, as occurs in Cr-rich alloys [28]. Moreover, the manufacturing process and porosity of the materials obtained affects the degradation mechanisms at high temperature.…”

Section: Discussionsupporting

confidence: 60%

Oxidation Behavior of Highly Porous Metallic Components

et al. 2008

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This paper covers a study on the oxidation behavior in air of four materials processed by means of powder metallurgy (PM), in such a manner that their porosity will be high and so they can be used to manufacture anodic supports in solid-oxide fuel cells (SOFC). For this, powders with a Fe base (AISI 430L and Fe22Cr grades) and with Ni base (Ni20Cr and Ni625 grades) have been processed through a novel method specifically designed for this type of applications. The oxidation kinetics of the four materials has been studied during their exposure to high temperature, and the oxides formed both inside and on the samples have been characterized. The protective abilities of the oxides formed depend on the chromium losses during sintering of the outer surface, the oxygen diffusion rate during hightemperature exposure and the irregularities on the morphology caused by the processing method. The results of these studies have allowed to reach the conclusion that, from amongst the materials tested, Fe22Cr exhibits the best behavior in air at 800°C.

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Section: Discussionsupporting

confidence: 60%

Oxidation Behavior of Highly Porous Metallic Components

et al. 2008

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“…Addition of Fe and Si in Co-7Al-7W system has also been reported to exhibit beneficial effect at 800°C [13]. When temperature is higher than 1000°C, Cr 2 O 3 layer has become less protective [2,14], and the protective oxide scale has primarily been Al 2 O 3 [15]. Several literature have indicated that Si addition can promote the formation of Al 2 O 3 and improve the adhesion between Al 2 O 3 and substrate in Ni-based superalloys [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behaviour of Si-Bearing Co-Based Alloys

et al. 2016

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The high-temperature oxidation behaviour of Si-bearing cobalt-base superalloys has been investigated. Isothermal oxidation tests conducted at 900, 1000, and 1150°C indicated that silicon addition can improve oxidation resistance. Furthermore, the alloy content of tungsten can have profound impact on the oxidation behaviour; low content of tungsten can promote the formation of protective alumina at temperatures at and above 1000°C, while high tungsten content can slow down oxidation at 900°C. Graphical Abstract

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“…At the initial oxidation stage, a thin film of Cr 2 O 3 immediately formed because of the greater negative Gibbs free energy for the oxidation reaction between chromium and oxygen [21]. With the continuous oxidation, the volatilization of Cr 2 O 3 takes place at the temperature up to 1000°C [22,23] grow toward the matrix because the outer spinel layer could not restrict the inward diffusion of oxygen [24]. The presence of internal silica at the scale-alloy interface is attributed to the reaction of silicon with oxygen which diffuses from the oxide scale.…”

Section: Internal Oxidation Behaviormentioning

confidence: 99%

Effect of Intergranular Precipitation on the Internal Oxidation Behavior of Cr–Mn–N Austenitic Stainless Steels

Zheng

Kang

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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The effect of intergranular precipitation on the internal oxidation behavior of Cr-Mn-N austenitic steels at 1000°C in dry air atmosphere was investigated using scanning electron microscope, transmission electron microscope, and X-ray diffraction analysis. The results show that intergranular M 23 C 6 carbide morphologies play an important role on the internal oxidation behavior of Cr-Mn-N steels. During the period of the oxidation, both discontinuous chain-shaped and continuous film-shaped intergranular M 23 C 6 carbides precipitated along the grain boundaries. Internal oxides of silica preferentially intruded into the matrix along grain boundaries with discontinuous M 23 C 6 carbide particles, while silica was obviously restricted at the interfaces between the external scale and matrix on the occasion of continuous film-shaped M 23 C 6 carbides. It is seemed that reasonable microstructure could improve the oxidation resistance of Cr-Mn-N steels.

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Kinetics of High Temperature Oxidation and Chromia Volatilization for a Binary Ni–Cr Alloy

Cited by 148 publications

References 7 publications

Oxidation Behavior of Highly Porous Metallic Components

Oxidation Behavior of Highly Porous Metallic Components

Oxidation Behaviour of Si-Bearing Co-Based Alloys

Effect of Intergranular Precipitation on the Internal Oxidation Behavior of Cr–Mn–N Austenitic Stainless Steels

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