Deposition and Applications of Quasicrystalline Coatings

Besser, M.F.; Eisenhammer, T.

doi:10.1557/s088376940003445x

Cited by 55 publications

(18 citation statements)

References 20 publications

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“…Todas las muestras presentan fase icosaédrica en distintas proporciones La muestra QC-1 presenta, además de la fase cuasicristalina, la fase cúbica AlFe. Las mismas fases, y en proporciones similares, fueron obtenidas en recubrimientos producidos por thermal spray (5).…”

Section: Resultados Y Discusiónunclassified

Recubrimiento por láser de aleaciones cuasicristalinas

Audebert¹,

Colaço²,

Vilar³

et al. 1998

REVMETAL

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Resumen Los cuasicristales constituyen un nuevo tipo de estructuras ordenadas con características metaestables a temperatura ambiente. En general, en determinadas aleaciones, pueden obtenerse por enfriamiento rápido desde el estado líquido. Han demostrado poseer buenas propiedades para su aplicación como recubrimientos resistentes al desgaste y a la corrosión. En este sentido, desde hace unos años, se ha impulsado el desarrollo de su aplicación mediante técnicas de thermal spray, aunque no se han encontrado referencias de su aplicación mediante técnicas de láser. En este trabajo, se presenta la formación de cuatro recubrimientos de aleaciones con composiciones cuasicristalinas sobre un sustrato de aluminio, utilizando un láser continuo de C0 2 , con inyección simultánea del material en forma de mezcla de polvos. Los mismos fueron caracterizados por difracción de rayos X, microscopía electró-nica de barrido y microdureza Vickers.Palabras clave: Aleaciones de aluminio. Cuasicristales. Recubrimientos por láser. Láser cladding of quasicrystalline alloysAbstract Quasicrystals are a new class of ordenated structures with metaestable characteristics at room temperature. Quasicrystalline phases can be obtained by rapid quenching from the melt of some alloys. In general, quasicrystals present properties which make these alloys promising for wear and corrosión resistant coatings applications. During the last years, the development of quasicrystalline coatings by means of thermal spray techniques has been impulsed. However, no references have been found of their application by means of láser techniques. In this work four claddings of quasicrystalline compositions formed over aluminum substrate, produced by a continuos C0 2 láser using simultaneous powders mixture injection are presented. The claddings were characterized by X ray diffraction, scanning electrón microscopy and Vickers microhardness.

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Section: Resultados Y Discusiónunclassified

Recubrimiento por láser de aleaciones cuasicristalinas

Audebert¹,

Colaço²,

Vilar³

et al. 1998

REVMETAL

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“…The ingot of the initial alloy of 50 mm diameter and 200 mm length was placed in a copper water-cooled crucible and the above alloy was added to the melt at a constant rate. 15 .…”

Section: Methodsmentioning

confidence: 99%

“…Thus, a modification of grain size of QCs and approximants by using different methods of preparation of QC coatings (e.g., PVD [5,13,14] and plasma spraying methods [15]) enables one to open new possibilities for applications of materials with QC and approximant structures.…”

Section: Surfaces / Thin Filmsmentioning

confidence: 99%

Structure and properties of quasicrystalline and approximant EBPVD coatings of Al-based systems

Ustinov¹,

Поліщук²,

Scorodzievskii³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. This paper considers main features of the formation of Al--Cu--Fe and Al--Cr--Fe coatings with complex crystalline structures using high-rate electron beam physical vapour deposition (EBPVD). It is shown that the deposition of the coatings at substrate temperatures below approximately 570 K leads to the formation of nanostructured quasicrystalline or approximant phases. Mechanical behaviour at static and dynamic loadings of the coatings was investigated. It is established that the decreasing of the grain size in the materials to nanoscale values results in significant enhancement of their damping capacity (a mechanical energy dissipation in the materials) at alternate strains. Possibilities of the use of materials based on quasicrystalline and/or approximant phases as hard and high damping coatings for the prevention of early destruction of gas turbine blades are discussed.

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“…five-fold, eight-fold, ten-fold and twelvefold). Due to the aperiodicity, these materials are expected to exhibit properties that are very different from conventional metallic materials [1][2] and these properties can be exploited for industrial applications [3][4][5][6]. More recently, there have been studies on the formation of spinel phases from quasicrystalline materials in Al--Co--Ni and Al--Ni--Fe systems [7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline spinel phase by mechanical milling of Al–Cu–Fe and Al–Cu–Cr–Fe quasicrystalline alloys

Mukhopadhyay¹,

Yadav²,

Tiwari³

et al. 2008

Zeitschrift Für Kristallographie

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Abstract. In the present study, a low-temperature synthesis of (Cu,Fe)Al 2 O 4 and (Cu,Cr,Fe)Al 2 O 4 spinels from the quasicrystalline phases was investigated with the variation of process parameters during milling and annealing. The milling of the quasicrystalline materials was carried out in an attritor mill at 400 rpm for 40 hours with ball to powder ratio of 40 : 1 in hexane medium. Subsequently, annealing was performed in an air ambience for 10, 20, and 40 h at 400, 500, 600 and 700 C inside a furnace in order to oxidize the mechanically milled quasicrystalline phase for the possible formation of the spinel phase. It was found that after annealing at higher temperatures ($500 C), mechanically milled quasicrystalline alloy transformed to a spinel phase whereas annealing at lower temperatures (<500 C) led to the formation of B2 phase as a major one along withminor amount of oxide phase. The X-ray diffraction and transmission electron microscopy of the annealed samples confirmed the formation of the spinel phase with an average grain size of $20-40 nm. It is interesting to note that the nanospinel phases showed the different colors during various annealing time and temperature. The optical properties of nanospinel materials, investigated employing UV visible spectrometer exhibited absorption characteristics.

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Deposition and Applications of Quasicrystalline Coatings

Cited by 55 publications

References 20 publications

Recubrimiento por láser de aleaciones cuasicristalinas

Recubrimiento por láser de aleaciones cuasicristalinas

Structure and properties of quasicrystalline and approximant EBPVD coatings of Al-based systems

Synthesis of nanocrystalline spinel phase by mechanical milling of Al–Cu–Fe and Al–Cu–Cr–Fe quasicrystalline alloys

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