Corrosion resistance of W and Ta based amorphous coatings in a geothermal steam environment – A combinatorial study

Tryggvason, T.K.; Tryggvason, A.; Karlsdóttir, Sigrún N.; Ingason, Arni Sigurdur; Arnalds, Unnar B.; Magnus, Fridrik

doi:10.1016/j.geothermics.2020.101859

Cited by 6 publications

(5 citation statements)

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“…Grazing incidence X-ray diffraction (GIXRD) and X-ray reflectivity (XRR) measurements were used pre and post annealing to examine changes in structure. Details of the system and optics used for GIXRD and XRR measurements can be found in [5].…”

Section: Methodsmentioning

confidence: 99%

Structural and magnetic changes in CoAlZr thin films upon post annealing

Tryggvason

Frimannsdottir

Sultan

et al. 2022

2022 International Semiconductor Conference (CAS)

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We present a study of the effect of annealing amorphous ferromagnetic thin films of Co 0.85 (Al 0.7 Zr 0.3 ) 0.15 , post deposition. The annealing was done in vacuum with no applied magnetic field. We find that already at a relatively low annealing temperature of 130 • C there is crystallite formation that introduces both structural and magnetic inhomogeneity. This does not affect the saturation magnetization strongly, but strongly affects the switching behavior and the overall effective anisotropy of the films. Further, there is a dramatic increase in magnetization damping. Thus, the annealing has a profound effect on both static and dynamic magnetic properties of the material. This is important to keep in mind for potential applications using these materials.

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Section: Methodsmentioning

confidence: 99%

Structural and magnetic changes in CoAlZr thin films upon post annealing

Tryggvason

Frimannsdottir

Sultan

et al. 2022

2022 International Semiconductor Conference (CAS)

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“…Tungsten and Tantalum: An innovative approach to WSi and TaSi alloy coating design was proposed by Tryggvason et al [184] In the study, a combinatorial DC magnetron sputtering PVD method was used to deposit graded compositions of WSi (4-60at.% W) and TaSi (12-80at.% Ta) coatings over both single crystal silicon Si(100) and stainless-steel type 304 (UNS S30400). The amorphous/crystalline nature of the as-deposited coatings was evaluated, together with microstructural examination and compositional analyses.…”

Section: Coatingsmentioning

confidence: 99%

Research and Development on Coatings and Paints for Geothermal Environments: A Review

Fanicchia,

Karlsdottir

2023

Adv Materials Technologies

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Geothermal power plants are complex systems, where the interplay between different metallic components transforms the enthalpy of hot brine in the form of electricity or usable heated water. The naturally occurring variety in brine chemistry, linked to the presence of specific key species, and its thermo‐physical properties, leads to the development of different power plant configurations. Key species and power plant configuration in turn determine the extent of damage experienced by each component in the power plant: erosion, corrosion, and/or scaling, often acting combined. Paints and coatings, compared to changing the component alloy, have represented a preferred solution to mitigate these issues due to advantages in terms of costs and repairability. This is reflected in the large number of publications on research and development in this area within the past ≈50 years, with even an increasing trend in the past 10–20 years, indicating the strong interest to develop this clean and sustainable energy source. Therefore, in this work, the first of its kind after 1980, an in‐depth review of all published work on research performed on paints and coatings for geothermal applications, subdivided by the material system, is provided.

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“…A pathway to designing metallic glasses with crystallization temperatures above 700 °C is to use refractory elements, such as W, Ta, Mo, or Nb. W-and Ta-based glasses have been observed to have the highest crystallization temperatures and mechanical strengths, but Ta has higher corrosion resistance than W [18] and Nb [19]. Ni in combination with Ta and Nb may increase the metal content of the alloy while retaining high thermal stability, mechanical properties, and corrosion resistance [19,23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Ni in combination with Ta and Nb may increase the metal content of the alloy while retaining high thermal stability, mechanical properties, and corrosion resistance [19,23,24]. Mechanical strength can be increased further through addition of metalloids and/or non-metallic elements, such as B, C, and Si [20,17,21,18]. However, excess amounts of these can induce brittle behavior in the material [22].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the high cooling rate [25] can be utilized to synthesize metallic glasses over wide composition ranges [26], whereby composition and property relationships can be determined. In this work, combinatorial design approaches and compositional tuning [27,18,6,[28][29][30] have been employed to enhance the material properties of TaNiSiC and TaNiC glasses, which to our knowledge have not been studied before. They are expected to form metallic glasses over wide composition ranges due to high cooling rates during sputtering and their spread in atomic radii (Ta: 147 pm, Ni: 127 pm, Si: 117 pm, and C: 77 pm) [32,33].…”

Section: Introductionmentioning

confidence: 99%

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