The influence of substrate temperature and spraying distance on the properties of plasma sprayed tungsten and steel coatings deposited in a shrouding chamber

Matějíček, Jiří; Vilémová, Monika; Nevrlá, Barbara; Kocmanová, Lenka; Veverka, Jakub; Halasová, Martina; Hadraba, Hynek

doi:10.1016/j.surfcoat.2016.10.055

Cited by 19 publications

(12 citation statements)

References 21 publications

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“…Igitkhanov et al [91] provided some boundary conditions for the plasma-facing components (PFCs) in future fusion devices (such as DEMO), suggesting that the thickness of the W armor material of the PFCs can be only ~ 3 mm. Therefore, it is reasonable to produce W coatings to meet the application requirements in PFCs [92][93][94][95][96][97] by coating manufacturing technologies, such as chemical vapor deposition (CVD), vacuum plasma spray (VPS) and atmospheric plasma spray (APS). Notably, the W coatings could join directly with the heat sink materials or structural materials.…”

Section: Coating and Additive Manufacturing Techniquesmentioning

confidence: 99%

“…The hardness of the W coating is ~ 300-400 HV, which is equivalent to 80% of the present W mock-up. Matějíček et al [95] studied the influence of the substrate temperature on the W coating, and found that it was beneficial to obtain a high-dense W coating by increasing the temperature of the substrate. Further, the W coatings produced by the APS technique usually possess a very high oxygen content [96].…”

Section: Coating and Additive Manufacturing Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Manufacturing of tungsten and tungsten composites for fusion application via different routes

2019

Tungsten

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Tungsten is a refractory metal with the highest melting point of all metals, which is considered as a promising candidate material for plasma-facing materials in the future fusion reactor. However, tungsten faces several challenges from intrinsic embrittlement, irradiation embrittlement and recrystallization embrittlement during the operation of the fusion reactor. To satisfy the fusion engineering application, an advanced tungsten material with the fine grain and dense microstructure is required and developed. This paper briefly introduces the application background of the tungsten materials and mainly illustrates a series of common techniques for manufacturing advance tungsten materials, such as powder preparation technologies, bulk densification techniques, continuous processing technologies and the coating and additive manufacturing technologies. Furthermore, the development prospects for manufacturing techniques of tungsten materials are also presented in the end. Considering the tungsten materials employed in the fusion engineering application, combining these scalable techniques of the wet-chemical method, pressureless sintering and continuous deformation processing techniques would be the possible research and development routes to realize the manufacture of the advanced tungsten materials.

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Section: Coating and Additive Manufacturing Techniquesmentioning

confidence: 99%

Section: Coating and Additive Manufacturing Techniquesmentioning

confidence: 99%

Manufacturing of tungsten and tungsten composites for fusion application via different routes

2019

Tungsten

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“…Tungsten's has a high sputtering resistance [5], high melting temperature [6], high thermal conductivity [7] and low neutron activation [8]. The challenge of thermal expansion coefficient mismatch between tungsten and steel may be overcome by creating a functionally graded material (FGM) joint [9,10], using thermal spraying techniques, such as vacuum plasma spraying (VPS) [11][12][13] or atmospheric plasma spraying [14,15]. Oxide formation can be avoided by using either vacuum or non-oxygen gas shrouding [11,12,15].…”

Section: Introductionmentioning

confidence: 99%

W/EUROFER functionally graded coatings for plasma facing components: Technology transfer to industry and upscaling

Grammes

Emmerich

Aktaa

2021

Fusion Engineering and Design

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The tritium breeding blanket is a vital component of future fusion reactors, providing the fuel for the fusion reaction. Tungsten is a viable coating material to protect its first wall from erosion by plasma. The feasibility of applying tungsten coatings by vacuum plasma spraying has already been demonstrated, using a functionally graded material of mixed tungsten and EUROFER97 steel as connecting layer to mitigate a thermal expansion mismatch. This technology was now transferred to industrial level to enable further upscaling. Samples of three different sizes were coated, the largest ones measuring 500×250 mm² and containing mock-up cooling channels. The sample distortion was found to be small. An ultrasonic analysis did not reveal any delamination but indicated potential weaker spots in the corners that may have been subjected to faster cooling. Both the coating's thickness of 2 mm and linear chemical gradation over five interlayers met well with specifications, as verified by scanning electron microscopy, energy-dispersive Xray spectroscopy as well as image thresholding analysis. The microstructure consisted of typical splatshaped particles of tungsten and EUROFER, with minor porosity only. In total, these first results indicate that good coating quality can be achieved even in dimensions approaching fusion-relevant size.

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“…Various factors affect the adhesion strength, mechanical properties and the corrosion resistance of the coating layer produced by the plasma spray method [3, 4, 5, 6, 7]. Nuzzle distance from the substrate, coating pass number, applied spark current, preheating temperature [8], substrate preparation [6, 7, 8, 9] and percentage of aluminum and nickel in powdered alloys [10] are the effective parameters on the metal spray coating process. Moridi et al.…”

Section: Introductionmentioning

confidence: 99%

“…Jiří Matějíček et al. [8] investigated the effect of preheating temperature and distance from the nozzle on the properties of the tungsten coating layer by plasma spray method. They observed that, at lower distances and at higher preheating temperature, the grains grow in columnar form.…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance and hydrophilic properties of plasma sprayed Ni+5%Al coatings

Hajideh

Farahani

Pakravan

et al. 2019

Heliyon

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In this research, the AZ31 Mg alloy was coated with Ni5Al powder, using a plasma spray method. Effects of nuzzle distance and number of passes on corrosion behavior, hydrophilic properties and phase structure of the coated layer were studied. Samples in different distance of nozzle (150 and 300 mm) and different number of passes (2, 4 and 6) were examined. Corrosion behavior characterization was carried out using electrochemical impedance spectroscopy and potentiodynamic polarization methods. Hydrophilic properties of the coated layer were also investigated by the contact angle method. Results showed that by increasing the number of passes, the corrosion resistance and the contact angle were increased. On the other side, by increasing the nuzzle distance, the corrosion resistance and the contact angle were decreased. The Coated sample with 6 pass coating and nozzle distance of 150 mm had the best corrosion behavior and hydrophilic properties.

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The influence of substrate temperature and spraying distance on the properties of plasma sprayed tungsten and steel coatings deposited in a shrouding chamber

Cited by 19 publications

References 21 publications

Manufacturing of tungsten and tungsten composites for fusion application via different routes

Manufacturing of tungsten and tungsten composites for fusion application via different routes

W/EUROFER functionally graded coatings for plasma facing components: Technology transfer to industry and upscaling

Corrosion resistance and hydrophilic properties of plasma sprayed Ni+5%Al coatings

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