Platinum Group Metals Base Refractory Superalloys

Yamabe‐Mitarai, Yoko; Koizumi, Yutaka; Murakami, Hideyuki; Ro, Y.; Maruko, Tomohiro; Harada, Hiroshi

doi:10.1557/proc-460-701

Cited by 24 publications

(14 citation statements)

References 4 publications

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“…In both cases, the advantages of PGM-based intermetallics over Ni-based superalloys are a significantly higher melting point (ϳ1500ЊC for Pt 3 Al and ϳ2100ЊC for RuAl) and inherent oxidation resistance, albeit with some increase in density. Recent reviews of these alloys are presented by Wolff et al 18,19 and YamabeMitarai et al 20 Most of the attention has been focused on Pt-and Ru-based compounds, but there have been some studies of Ir-based 21 and Rh-based 22 materials. Progress toward the desired properties has been either by alloying to improve strength and reduce density or by oxide-dispersion strengthening (ODS).…”

Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

259

102

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This introductory article provides the background for the September 2003 issue of MRS Bulletin on Ultrahigh-Temperature Materials for Jet Engines. It covers the need for these materials, the history of their development, and current challenges driving continued research and development. The individual articles that follow review achievements in four different material classes (three in situ composites-based on molybdenum silicide, niobium silicide, and silicon carbide, respectively-and high-melting-point platinum-group-metal alloys), as well as advances in coating systems developed both for oxidation protection and as thermal barriers. The articles serve as a benchmark to illustrate the progress made to date and the challenges ahead for ultrahigh-temperature jet-engine materials.

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Section: -17mentioning

confidence: 99%

Ultrahigh-Temperature Materials for Jet Engines

Zhao¹,

Westbrook²

2003

MRS Bull.

259

102

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“…X varied between 12 at.% and 18 at.%. [6][7][8][9][10] Characterization included scanning and transmission electron microscopies and x-ray diffraction. Microscopy revealed L1 2 precipitates in a fcc matrix.…”

Section: Development Of Refractory Superalloysmentioning

confidence: 99%

Development of Platinum-Group-Metal Superalloys for High-Temperature Use

Cornish¹,

Fischer²,

Völkl³

2003

MRS Bull.

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Superalloys based on platinum-group metals are being developed for hightemperature applications. These alloys have two-phase structures comprising either ordered precipitates in a matrix analogous to the nickel-based superalloys or a fine dispersion of oxide particles in a matrix analogous to oxide-dispersion-strengthened nickel-based alloys. Currently, alloys based on iridium, rhodium, and platinum have been obtained. This article reviews the rationale of developments and the progress made in this area. Oxidation and compression tests as well as characterization with scanning electron microscopy and transmission electron microscopy were undertaken. These tests showed encouraging results, and further work is being done on new alloying additions and tensile testing.

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“…It is necessary to search for new alloy systems with higher temperature capabilities. Among the existing intermetallic materials, the L 12 rhodium based alloys are more convenient for high temperature structural applications [2,3] due to its higher thermal conductivity, lower thermal expansion coefficient, low density and better oxidation resistance and they can also be prepared with a microstructure similar to that of nickel based alloys with enhanced ductility and workability [4e9]. Rhodium metal displays the most promising combination of properties for aerospace applications and frequently used as an alloying agent in other materials such as Platinum and Palladium.…”

Section: Introductionmentioning

confidence: 99%