Oxidation behavior of rhenium at high temperatures

Chou, Tse‐Chuan; Joshi, A.D.; Packer, C.M.

doi:10.1016/0956-716x(93)90593-h

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…This opens the unique possibility to adjust the required properties and to find a suitable balance between the need for toughness and ductility on the one hand and strength at temperatures beyond the capability of Nibased superalloys on the other hand [2]. Although rhenium is superior to most other refractory metals in its various high temperature properties and environmental compatibilities, its oxidation properties are rather poor [11,12,17].…”

Section: Introductionmentioning

confidence: 99%

“…Already in 1971, Dreshfield [10] reported about Re-containing cobalttungsten alloys for improved microstructural stability. Addition of rhenium to molybdenum and tungsten enhances ductility and formability [11][12][13][14]. Nowadays, rhenium is added to Ni-based alloys to improve mechanical properties through solid-solution hardening [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Oxidation Behaviour of Model Cobalt-Rhenium Alloys During Short-Term Exposure to Laboratory Air at Elevated Temperature

et al. 2009

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The alloys being used in high-temperature systems such as stationary gas turbines and aircraft engines are iron-, cobalt-and nickel-based superalloys, amongst which the latter is the most widely used for highest temperatures. However, the use of Ni-based alloys is limited to temperatures below 1,100°C. The experimental Co-Re-based alloys are promising for high-temperature applications for service temperatures beyond 1,200°C. The purpose of the present investigations, at this still early stage of the alloy development, is to gain a first insight into the oxidation mechanisms and to find ways to improve oxidation resistance of this class of materials. Thermogravimetric studies in combination with microstructural examinations of six model Co-Re alloys with different compositions showed the negative influence of rhenium on the oxidation resistance of Co-based alloys due to evaporation of rhenium oxide(s). Oxidation at 1,000°C in air yielded an oxide scale, that consists of a Co-oxide outer layer on a thick and porous Co-Cr oxide and a semicontinuous and therefore non-protective Cr-oxide film on the base metal substrate. This allowed for the vaporization of rhenium oxide formed during oxidation and hence led to a loss of Re. Computer-aided thermodynamic calculations were carried out to supplement the experimental analyses and were found to reasonably predict the stability ranges of the various oxide phases observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxidation Behaviour of Model Cobalt-Rhenium Alloys During Short-Term Exposure to Laboratory Air at Elevated Temperature

et al. 2009

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“…It is possible that Re 2 O 7 reacts and combines with ReO 2 during vaporization or condensation forming ReO 3 [13]. Figure 2a shows the cross-section of a sample of the alloy Co-17Re-23Cr oxidized for 50 h at 1,000°C at low oxygen partial pressure and subsequently exposed to air for the next 100 h. Characteristically for this alloy is the formation of an inhomogeneous oxide scale on the surface.…”

Section: Resultsmentioning

confidence: 97%

The Effect of Pre-Oxidation Treatment on the High-Temperature Oxidation of Co–Re–Cr Model Alloys at Laboratory Air

et al. 2010

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The aim of a pre-oxidation treatment at low oxygen partial pressure is to promote the formation of a Cr 2 O 3 (or Al 2 O 3 ) scale in such a way that the oxide layer can reliably prevent the contact of oxygen with the metallic substrate also at high oxygen partial pressure. In this study, the pre-oxidation treatment was applied to the two alloys Co-17Re-23Cr and Co-17Re-30Cr (at.%). Pre-oxidation of the Co-Re-xCr alloys was found to be non-protective for the metallic substrate at high oxygen partial pressure despite the formation of a Cr 2 O 3 layer. Different kinds of Cr 2 O 3 scale damage were observed depending on the Cr concentration. The Cr 2 O 3 scale formed on the alloy Co-17Re-23Cr loses its protective properties as a result of cation transport by lattice and grain boundary diffusion, while the Cr 2 O 3 scale formed on the alloy Co-17Re-30Cr degraded as a consequence of scale cracking. In addition, the effect of alloying with Si was investigated and found to be promising.

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“…In the temperature range 600 -1300 • C, Re 2 O 7 was identified by X-ray examination as the only volatile [41] whereas, at higher temperatures (1500-1900 • C), ReO 3 was the primary oxide present in the condensed vapor deposits [42]. When mixtures of Re metal and ReO 3 in different gross compositions are heated up, a stable intermediary ReO 2 phase is formed [43].…”

Section: Re Oxidationmentioning

confidence: 99%

Oxidation of High Yield Strength Metals Tungsten and Rhenium in High-Pressure High-Temperature Experiments of Carbon Dioxide and Carbonates

et al. 2019

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The laser-heating diamond-anvil cell technique enables direct investigations of materials under high pressures and temperatures, usually confining the samples with high yield strength W and Re gaskets. This work presents experimental data that evidences the chemical reactivity between these refractory metals and CO2 or carbonates at temperatures above 1300 °Ϲ and pressures above 6 GPa. Metal oxides and diamond are identified as reaction products. Recommendations to minimize non-desired chemical reactions in high-pressure high-temperature experiments are given.

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Oxidation behavior of rhenium at high temperatures

Cited by 14 publications

References 7 publications

Oxidation Behaviour of Model Cobalt-Rhenium Alloys During Short-Term Exposure to Laboratory Air at Elevated Temperature

Oxidation Behaviour of Model Cobalt-Rhenium Alloys During Short-Term Exposure to Laboratory Air at Elevated Temperature

The Effect of Pre-Oxidation Treatment on the High-Temperature Oxidation of Co–Re–Cr Model Alloys at Laboratory Air

Oxidation of High Yield Strength Metals Tungsten and Rhenium in High-Pressure High-Temperature Experiments of Carbon Dioxide and Carbonates

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