Quasicrystals

Maciá, Enrique; Dubois, Jean; Thiel, Patricia A.

doi:10.1002/14356007.e22_e01.pub2

Cited by 2 publications

(1 citation statement)

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“…Just a few years later, the existence of a thermodynamically stable quasicrystal was reported in the Al-Cu-Fe system by Tsai et al [2]. A stable quasicrystal can have several interesting properties, such as a high hardness, a low coefficient of friction, a low surface energy and a high oxidation and corrosion resistance [3,4]. These properties are appropriate for technological applications such as low-stick surfaces or mechanical devices with reduced friction [5].…”

Section: Introductionmentioning

confidence: 99%

Impact Of Tuned Oxidation on the Surface Energy of Sintered Samples Produced from Atomised B-Doped Al-Cu-Fe Quasicrystalline Powders

Kušter¹,

Kovač²,

Samardžija³

et al. 2023

Preprint

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Super-hydrophobic surfaces and coatings have stimulated a great deal of research, with the aim to achieve better wetting properties. Factors such as surface chemistry and roughness play an important role in changing the surface energy, which in turn leads to changes in the wettability. Here, we have analysed the time dependence of the oxide layer and possible surface adsorbates on the surface topography of an Al59Cu25Fe13B3 quasicrystalline material for changes to the wettability. The quasicrystalline matrix phase was 94 % of the sample volume, and covered by a very smooth, amorphous oxide layer. The AlB12 and AlFe2B2 boron-rich phases were embedded in the quasicrystalline material as a result of a 3 at.% boron addition, which makes atomisation of the material a simpler process. Under ambient conditions the sample was naturally covered by an oxide layer; therefore, it is referred to as “surfenergy”, to distinguish it from the conventional surface energy of a bare quasicrystal surface. The growth of the oxide layer with atmospheric ageing and annealing at 500° C in air for various times was investigated for both cases. The phase most prone to oxidation was the boron-rich AlFe2B2, which influenced the topography of the surface and accordingly the wetting behaviour of the specimen. We demonstrated that the surfenergy depends on the polar component, which is the most sensitive to the operating conditions. A correlation between the surfenergy components and the surface roughness was found. In addition, theoretical models to determine the wettability were included.

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Section: Introductionmentioning

confidence: 99%