Thin-film reactions of Al with Co, Cr, Mo, Ta, Ti, and W

Colgan, E. G.; Mayer, J. W.

doi:10.1557/jmr.1989.0815

Cited by 45 publications

(16 citation statements)

References 21 publications

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“…TiAl 3 has been identified as the single dominant phase which forms during the heating of Ti-Al diffusion couples [19][20][21][22][23][24]. This observation has been explained on the basis of the higher diffusivity of aluminum ions in TiAl 3 in comparison with other aluminides, which in any case might be formed in small amounts [23].…”

Section: Introductionmentioning

confidence: 99%

Reactive synthesis and characterization of titanium aluminides produced from elemental powder mixtures

Sina

Iyengar

2015

J Therm Anal Calorim

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The formation of titanium aluminides in Ti-Al elemental powder mixtures containing 25, 50 and 75 at.% Al, has been studied using differential scanning calorimetry (DSC). Phase evolution in the mixture was followed by heating the compacted samples up to 1273 K at 7.5 and 15 K min -1 . The cooled samples were characterized using X-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy. The results showed that the primary combustion product in all the samples was TiAl 3 , and the combustion reaction occurred below the melting point of aluminum only in Ti-rich samples. In Alrich samples (75 at.% Al), TiAl 3 was obtained as a porous, single-phase product after combustion. In samples containing 25 and 50 at.% Al, the combustion reaction was incomplete and the unreacted titanium particles were covered by a layer of TiAl 3 . In these samples, other intermetallic compounds such as TiAl 2 , TiAl and Ti 3 Al were observed to form upon heating beyond the combustion peak and are attributed to the solid-state reaction between unreacted titanium and TiAl 3 . Heating the samples with 25 at.% Al to 1273 K for an hour led to the formation of a homogenous Ti 3 Al product, while a multiphase product with a dominant TiAl phase was observed in samples containing 50 at.% Al. Calculations based on DSC data show that the formation of TiAl 3 through the reaction between solid titanium and molten aluminum is associated with an apparent activation energy of 195 ± 20 kJ mol -1 and an enthalpy of -114 ± 5 kJ mol -1 .

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Section: Introductionmentioning

confidence: 99%

Reactive synthesis and characterization of titanium aluminides produced from elemental powder mixtures

Sina

Iyengar

2015

J Therm Anal Calorim

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“…9) could be a consequence of chemical reactions, for example between Ta and Cu 29 or Ta and Al. 30 However, since thermal emittance was affected significantly, reactions with the Cu substrate are more likely to be the reason.…”

Section: Discussionmentioning

confidence: 99%

Aluminium and tantalum nitride barriers against copper diffusion in solar absorbers

Kotilainen

Vuoristo

2016

Surface Engineering

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The thermal stability of magnetron sputtered solar absorber coatings was investigated at temperatures of 200-500°C. Diffusion barriers of aluminium (Al) and tantalum nitride (TaN x ) were studied against thermal diffusion of copper substrate atoms. The diffusion barriers studied were experimental DC magnetron sputtered Al and TaN x layers between a copper substrate and an absorber coating. The absorbers were aged by means of heat treatment in air. The influence of diffusion barriers was analysed by optical and microstructural analyses before and after the ageing procedures. Without a barrier coating, copper substrate atoms diffused through the absorber to the surface, which degraded optical selectivity. The diffusion can be prevented or retarded with a dense diffusion barrier layer. The 500-nm-thick Al barrier layer prevented Cu diffusion and retained optical selectivity at 300°C. At higher temperatures, diffusion was observed but the Al barrier retarded the degradation when compared to an absorber without the barrier layer.

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“…[61][62][63][64]. These phenomena degrade the adhesion of the overlayer and impedes later alloying (62)(63). This a subject of great concern for researches about:…”

Section: Surface Texturingmentioning

confidence: 99%

Laser Processing of Metallic and Intermetallic Surfaces

Petit¹

1993

Materials and Manufacturing Processes

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The most common applications 01 the laser processing 01 metallic and intermetallic surfaces are presented. The advantages 01 this technology are deduced Irom the basic principles 01the interaction 01laser light w"h metallic materials. Applicetions, like superficial hardening and surface cleaning and alloying, are extensions 01 exi:rting processes beneming by the specific advantages 01laser annealing. Other ones, like de,position 01 passivating or wear·resistant coatings, exploit photochemical reactions induced in gas-phase or at metallic and semiconducting surfaces by UV or high intens"y laser beams.

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Thin-film reactions of Al with Co, Cr, Mo, Ta, Ti, and W

Cited by 45 publications

References 21 publications

Reactive synthesis and characterization of titanium aluminides produced from elemental powder mixtures

Reactive synthesis and characterization of titanium aluminides produced from elemental powder mixtures

Aluminium and tantalum nitride barriers against copper diffusion in solar absorbers

Laser Processing of Metallic and Intermetallic Surfaces

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