Numerical and experimental depth profile analyses of coated and attached layers by laser-induced breakdown spectroscopy

Ardakani, H. Afkhami; Tavassoli, Seyed Hassan

doi:10.1016/j.sab.2010.02.005

Cited by 17 publications

(7 citation statements)

References 34 publications

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“…Figure A depicts the fluence dependency of average ablation rate (AAR) of W coating on CuCrZr substrate. The AAR was calculated by Equation , and the results are given in Table .

italicAAR ((), italicμm / italicpulse) = \frac{D ((), μm)}{P_{0.5} ((), pulses)}

…”

Section: Resultsmentioning

confidence: 99%

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

Imran

Sun

Liu

et al. 2018

Surface & Interface Analysis

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Laser induced breakdown spectroscopy (LIBS) was employed to find the depth profile of W-coated CuCrZr alloy. Cathodic arc deposition method was applied to produce tungsten coating on the CuCrZr alloy. The LIBS measurements were carried out by using a Nd:YAG laser at its fundamental wavelength (1064 nm) with various fluences.The spectral intensity emitted from laser induced plasma of the coating material was investigated for both elemental and depth-profile analyses in terms of linear correlation coefficient. Other surface characterization techniques (scanning electron microscopy and energy dispersive X-ray) were also used to determine morphology and elemental composition. It is observed that nonuniform radial energy distribution of Gaussian laser beam caused gradual decay of spectral lines of the coating and rise of substrate lines. The results indicate that the spectral intensity from W coating was higher than that from the bulk material at same laser fluence. The high-resolution in-depth profile was achieved at low fluence. This study demonstrates that LIBS is a promising technique for the depth-profiling analysis of W coating of EAST-like material and can be used to determine the material erosion and impurity deposition on plasma facing components. KEYWORDS cathodic arc deposition, CuCrZr alloy, depth profile, LIBS, W-coating 1 | INTRODUCTION Metallic coatings for various applications, like plasma facing material, wear and corrosion resistance, and protection against erosion, have great importance and are in a high demand both in technology and industry. 1 Many types of coating are used to improve mechanical, optical, thermal, electrical, chemical, and magnetic properties of the substrate. Many applications in industry require in-depth characterization of coated layers with thickness from nanometre to tens of micrometre. 2 The plasma facing components (PFCs) used in fusion devices have to operate under highly aggressive environment. The coatings deposition produced on PFCs have to protect them from high heat flux plasm particles in order to improve their performance in long pulse operations. However, some materials are eroded as high heat flux strike with wall components and redeposited as an impurity on PFCs which changed the surface composition. 3-5 Moreover, the exposure of PFCs to high-energy particles fluxes changes the surface crystallinity and causes the change in ablation threshold value. In EAST tokamak, the ITER-like W mono-blocks were used in upper divertor target. The divertor baffle and dome were made of W/CuCrZr (W plates on CuCrZr alloy). 6,7 A reliable technique is required to measure the depth profile of erosion and impurity deposition on surface modification which could perform in the tokamak-like environment for in-situ analysis and give the entire information of elemental composition.Laser induced breakdown spectroscopy (LIBS) is a promising multi-element analytical technique for in-situ analysis of the chemical composition of components inside the vacuum vessel of fusion devices. [8][9][10...

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“…Figure A depicts the fluence dependency of average ablation rate (AAR) of W coating on CuCrZr substrate. The AAR was calculated by Equation , and the results are given in Table .

italicAAR ((), italicμm / italicpulse) = \frac{D ((), μm)}{P_{0.5} ((), pulses)}

…”

Section: Resultsmentioning

confidence: 99%

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

Imran

Sun

Liu

et al. 2018

Surface & Interface Analysis

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“…The main aim of this paper is to simultaneously use two monitoring methods, shadowgraphy [7] and LIBS [12] and to evaluate both techniques for the analysis and monitoring of laser ablation of copper from the printed circuit boards. LIBS has been chosen, since in the last decade it has been extensively used for selective thin-layer removal [13][14][15][16][17][18][19]. Therefore, we employed it as a comparative and/or reference technique in our experimentation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of laser-induced thin-layer removal by using shadowgraphy and laser-induced breakdown spectroscopy

et al. 2016

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Shadow photography and laser-induced breakdown spectroscopy (LIBS) are studied as methods for monitoring the selective removal of thin (i.e., under 100 m) layers by laser ablation. We used a laser pulse of 5 ns and 16 mJ at 1064 nm to ablate an 18-m-thin copper layer from the fiberglass substrate. On the basis of shadowgraphs of the laser-induced shock waves, we measured the optodynamic energy-conversion efficiency, defined as the ratio between the mechanical energy of the shock wave and the excitation-pulse energy. Our results show that this efficiency is significantly higher for the laser-pulse-copper interaction than for the interaction between the excitation pulse and the substrate. LIBS was simultaneously employed in our experimental setup. The optical emission from the plasma plume was collected by using a spectrograph and recorded with a streak camera. We show that advancing of laser ablation through the copper layer and reaching of the substrate can be estimated by tracking the spectral region between 370 nm and 500 nm. Therefore, the presented results confirm that LIBS method enables an on-line monitoring needed for selective removal of thin layers by laser.

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“…Because of this, LIBS is one of the primary direct analysis methods for thin protective coatings which effectively improve the performance of the products contributing to their resistance to wear and durability. But the papers devoted to LIBS of thin coatings on commercial samples are few [3,4], whereas quantitative analysis of massive objects manufactured of multicomponent alloys has been comprehensively studied and adequately described in the literature [1,2,5,6]. In the majority of the works devoted to LIBS of thin layers the attention is focused on analysis of the samples with singlecomponent coatings (e.g., zinc-coated steel or copper foils attached to steel and aluminum substrates) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Double Pulse LIBS of Titanium-Based PVD-Coatings with Submicron Resolution

Ермалицкая

Voropay

2016

International Journal of Spectroscopy

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The possibility for double pulse LIBS in the process of a direct layer-by-layer analysis of the titanium-based PVD-coatings on polished flat blank samples of steel and silicon and also of the TiAlN/TiN-coating on a milling cutter is considered. A method is proposed to control thickness of the radiation evaporated layer by defocusing the laser beam with respect to the surface, making it possible to attain the depth resolution of 0.1 μm. The Ti and Ti-Zr-coatings produced using the ion-assisted condensation method and subjected to streams of the nitrogen plasma in a magnetic-plasma compressor are studied.

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Numerical and experimental depth profile analyses of coated and attached layers by laser-induced breakdown spectroscopy

Cited by 17 publications

References 34 publications

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

Evaluation of laser-induced thin-layer removal by using shadowgraphy and laser-induced breakdown spectroscopy

Double Pulse LIBS of Titanium-Based PVD-Coatings with Submicron Resolution

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