Interfacial Adhesion of Thick NiTi Coating on Substrate Stainless Steel

Samal, Sneha; Kopeček, Jaromı́r; Šittner, Petr

doi:10.3390/ma15238598

Cited by 12 publications

(11 citation statements)

References 30 publications

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“…The results of elemental composition are available in the supplementary file Figures S1-S4. This result has similar findings with other researchers [28][29][30]. The plasma spray parameters affect certain factors of the coating, such as the size and distribution of porosity, oxide content, residual stresses and macro and microcracks, factors which have an important influence on the performance of the coating as samples [31,32].…”

Section: Figure 1asupporting

confidence: 90%

“…The maximum stress under the spherical indenter remains finite. The strain caused by the stress distribution under the spherical indenter was largely accommodated by winning mechanisms in the martensite, leading to shape recovery upon heating [30]. In the case of sample 1, the contribution of martensite is larger than sample 1, which leads to more recovery from deformation.…”

Section: Elastic Recovery-mechanical Vs Thermalmentioning

confidence: 99%

“…Although researchers use the thermal plasma spray process for coating purposes, an approach to prepare bulk samples was not targeted yet. Recently, in our previous article thermal plasma spraying was used using NiTi powder to prepare bulk samples of NiTi alloy that are able to display functional properties with shape memory effect [30]. To understand more about the plasma sprayed NiTi alloy behaviour and its thermal recovery with indents, scratches and wear, tests are performed in this work.…”

Section: Introductionmentioning

confidence: 99%

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Surface Deformation Recovery by Thermal Annealing of Thermal Plasma Sprayed Shape Memory NiTi Alloys

et al. 2023

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The shape memory effect is the most important attribute of shape memory alloys where material can recover to its initial shape after deformation by heating above its transformation temperature. In this article, the thermally induced recovery of well-defined microscopic deformation in a NiTi shape memory alloy was investigated. Surface deformation was performed by indenting the plasma sprayed NiTi shape memory alloy in a martensitic phase at room temperature using spherical indenters. In this article, a series of indentations, scratch lines and wear lines were made on the surface of two different NiTi shape memory alloys at the micrometre scale using two spherical indenters with different radii. Three-dimensional imaging of indentation topography using scanning confocal microscopy provided direct evidence of the thermally induced martensitic transformation of these plasma sprayed thick films allowing for partial recovery on the micro-scale. The partial recovery is achieved at various indentation depths and for different scratches and wear volumes.

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Section: Figure 1asupporting

confidence: 90%

Section: Elastic Recovery-mechanical Vs Thermalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Deformation Recovery by Thermal Annealing of Thermal Plasma Sprayed Shape Memory NiTi Alloys

et al. 2023

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“…Generally, the coatings can be prepared using several processes, such as spark plasma sintering [14] and thermal spraying [15]. Plasma spraying has emerged as one of the potential routes to deposit thick coating layers on the structure material [16]. At present, silicon coatings prepared with atmospheric plasma spraying (APS) are the most extensively applied as bond layers of EBCs.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Control of Residual Stress in Plasma-Sprayed Silicon Coatings on SiC/SiC Composites

et al. 2023

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In order to reveal the relationship between residual stress in Si layers of SiC/SiC composites and the different parameters used in their preparation, the residual stress of the coating surface was tested using X-ray sin2ψ technology and laser Raman spectroscopy. Then, the Raman shift–stress coefficient (P) and the Raman shift with free stress (ω0) were calculated as −201.41 MPa/cm−1 and 520.591 cm−1 via linear fitting with the least squares method. The results showed that all the as-sprayed Si coatings exhibited tensile stress on the surface, ranging from 53.5 to 65.9 MPa. The parameters of the spraying distance and second gas (H2) flow rate were considered to be the most important for controlling the residual stress on the coating surface. Additionally, the surface tensile stress of the Si layers could be eliminated and even changed into compressive stress by annealing above 800 °C. Furthermore, the residual stress distribution in the cross-section of the Si layers was evaluated using laser Raman spectroscopy. Additionally, the particle characteristics, such as in-flight velocity and temperature, were investigated using a diagnostic system. The results of this research contribute to increasing the understanding and control of residual stress in APS Si bond layers.

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“…The effect of the processing parameters influences pores, and the sensitivity of porous architecture also affects the coating behavior in the material [11][12][13]. Some researchers mentioned that the effect of spraying variables or parameters strongly influences the density of the hard coatings [14,15]. The porosity value is unlikely to be predictable before applying a coat, by the spraying process, with a variety of mechanical and thermo-physical properties [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Microstructure–Porosity–Hardness of Thermal Plasma-Sprayed NiTi Coating Layers

Samal,

Zeman,

Habr

et al. 2023

JMMP

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The quality of NiTi coating influences the thermal, microstructural, and mechanical behavior of the material produced by plasma spraying. To understand the behavior of the coating, the study has been designed and planned at two different plasma powers with various feed rates. NiTi as shape memory layers emerge as promising protective coatings on the surface of substrates against corrosion or wear. In the present investigation, NiTi multilayers were produced by thermal plasma spraying using NiTi (50 at. %) powder as the feedstock material. This work illustrates the studies of the microstructure, porosity of the coating layers, phase detection, hardness values, shape memory behavior, and the formation of samples produced by different spraying parameters. The porosity within coating layers has been analyzed based on the various shape factors of pores that correlate with the hardness and mechanical behavior of the samples. This work will explore the quality of the coating in terms of its porosity and compactness, which will affect the performance of the shape memory behavior. The functional coating of NiTi will have a significant influence on the durability of the material’s performance against corrosion.

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Interfacial Adhesion of Thick NiTi Coating on Substrate Stainless Steel

Cited by 12 publications

References 30 publications

Surface Deformation Recovery by Thermal Annealing of Thermal Plasma Sprayed Shape Memory NiTi Alloys

Surface Deformation Recovery by Thermal Annealing of Thermal Plasma Sprayed Shape Memory NiTi Alloys

Characterization and Control of Residual Stress in Plasma-Sprayed Silicon Coatings on SiC/SiC Composites

Evaluation of Microstructure–Porosity–Hardness of Thermal Plasma-Sprayed NiTi Coating Layers

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