Effect of changes of the coating thickness on the in-line monitoring of the conversion of photopolymerized acrylate coatings by near-infrared reflection spectroscopy

Mirschel, Gabriele; Heymann, Katja; Scherzer, Tom; Buchmeiser, Michael R.

doi:10.1016/j.polymer.2009.02.027

Cited by 33 publications

(24 citation statements)

References 12 publications

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“…The automatic film application technique is a new and relatively less expensive process for fabricating surface coatings using automatic film applicator machine. The machine is equipped with different wirewound bars with very small gaps based on the user requirements in order to have the required coating thickness similar to those frequently used for thermal barrier coating applications [35][36][37]. It has the advantages of accuracy, simplicity, and reproducibility, thus eliminating uncertainty and human error [36,38].…”

Section: Introductionmentioning

confidence: 99%

Solvent Based Slurry Functional Graded Thermal Barrier Coating for Application in Automotive Turbocharger Turbine Volute Casing

Mohd¹,

Rabiu²,

Uday³

2016

Fifth International Conference on Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2016

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Abstract-Tremendous amount of heat is being lost at the turbine area of an automotive turbocharger during its operation. Application of ceramic thermal barrier coating to components operating under severe temperature condition such as automotive turbocharger turbine volute casing can reduce the heat lost to the environment, improve the efficiency and reliability of components and extend their service life. But high cost of installation and maintenance, complexity and spallation problem due to thermal expansion mismatch between the ceramic and the metal substrate have seriously restricted the acceptance and widespread practice of ceramic thermal barrier coating. In the present study, a solvent based slurry functionally graded thermal barrier coating technique was employed in depositing different compositions of Yttria stabilized zirconia and nickel powders on a nickel alloy substrate using a simple laboratory-scale surface coating machine. The coating compositions of 25wt% YSZ & 75wt% Ni, 60wt% YSZ & 40wt% Ni and 75wt% YSZ & 25wt% Ni were used for the deposition of the first layer, second layer and third layer of the functionally graded coating on the nickel substrate respectively. Experimental validation of heat transfer across the coating and adhesion tests were used to evaluate the suitability and integrity of the functionally graded coating produced for the intended application. The coating microstructure was also analyzed using optical microscope, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The results have shown that, the functionally graded coating produced has the heat resistance capability of 35 0 C, 140 0 C and 250 0 C for one layer, two layer and three layer respectively. The adhesion strength of the coating improved with an increase in the number of the coating layers. There was no spallation problem observed from the coating, also no crack or deformation was observed from the results of the microstructural analysis of the functionally graded coating after the experimental heat transfer tests.

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Section: Introductionmentioning

confidence: 99%

Solvent Based Slurry Functional Graded Thermal Barrier Coating for Application in Automotive Turbocharger Turbine Volute Casing

Mohd¹,

Rabiu²,

Uday³

2016

Fifth International Conference on Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2016

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“…The conversion was predicted for layers based on (meth)acrylates, epoxides and/or vinyl ethers. Moreover, it was shown that conversion and thickness (or coating weight) can be monitored simultaneously either by application of special calibration algorithms [27] or by use of several probe heads [28].…”

Section: Introductionmentioning

confidence: 99%

The effect of different gloss levels on in-line monitoring of the thickness of printed layers by NIR spectroscopy

et al. 2012

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Near-infrared (NIR) reflection spectroscopy was used for monitoring the thickness or rather the coating weight of thin printed layers of transparent oil-based offset printing varnishes in a range from 0.5 to 5 g m(-2). Quantitative analysis of the spectral data was carried out with partial least squares regression. Surface properties such as the gloss were found to strongly affect the prediction of the coating weight. This influence was minimized by the development of calibration models, which contained spectra of layers with a broad range of gloss levels. The prediction error of these models was in the order of 0.12 to 0.16 g m(-2). In-line measurements were carried out at a sheet-fed offset printing press in order to test the performance of the models under real process control conditions. Varnishes were applied to paper at printing speeds of 90 or 180 m min(-1). A close correlation between the predictions from in-line NIR spectra and the reference data from gravimetry was observed regardless of the specific degree of gloss of the layers (errors between 0.15 and 0.17 g m(-2)). The results clearly prove the efficiency of NIR reflection spectroscopy for quantitative investigations on thin layers in fast processes such as printing and demonstrate its analytical potential for quality and process control.

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“…They are used as abrasion-resistant coatings, [1][2][3] components in optical telecommunication 4,5 and dental restorative materials. [6][7][8][9][10] A great problem with the application of dimethacrylate-based polymers is the depth of the polymerization and how to appropriately measure it.…”

Section: Introductionmentioning

confidence: 99%

“…The higher the conversion of double bonds, the higher the mechanical strength, modulus and hardness. 2,3,[7][8][9][10]14,15 Since the structure of polymer network formed, characterized by the DC, has considerable influence on the final mechanical properties, knowledge of the DC is essential.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4]7,10,12,[14][15][16][17][18][19][20][21][22][23][24] To determine the DC by vibrational spectroscopy, the disappearance of signals generated by vibrations of double vinyl bonds are monitored. The content of methacrylate groups remaining in the sample after irradiation can be estimated by the intensities of the peaks, either at 1637 cm À1 referring to the C¼ ¼C stretching or at 816 cm À1 referring to the C¼ ¼C twisting.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative determination of degree of conversion in photocured poly(urethane‐dimethacrylate)s by Fourier transform infrared spectroscopy

Barszczewska-Rybarek

2011

J of Applied Polymer Sci

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In this work, infrared spectroscopy was used to characterize the degree of double bonds conversion (DC) in six series of poly(urethane-dimethacrylate)s, derived from dicarbamates of oligoethylene glycols monomethacrylates and aliphatic, cycloaliphatic and aromatic diisocyanates. To evaluate the degree of conversion in polymers devoid of aromatic moieties, two methods of calculation have been proposed: internal band ratio method, with carbonyl stretching vibrations as a standard, and a method involving the direct observation of the decrease in the intensity of C¼ ¼C stretching band. The validity of these methods has been checked on polymers with aromatic structures, by comparing the results with those obtained by the internal band ratio method applying an aromatic band as a reference. A good correlation between the degree of conversion from two internal standard methods, using aromatic band and carbonyl band as references, was obtained. It was shown that the degree of conversion increases as the number of oxyethylene units increases. Polymerization of monomers with aliphatic cores resulted in higher DC values, while those with cycloaliphatic and aromatic cores-resulted in lower DC values.

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Effect of changes of the coating thickness on the in-line monitoring of the conversion of photopolymerized acrylate coatings by near-infrared reflection spectroscopy

Cited by 33 publications

References 12 publications

Solvent Based Slurry Functional Graded Thermal Barrier Coating for Application in Automotive Turbocharger Turbine Volute Casing

Solvent Based Slurry Functional Graded Thermal Barrier Coating for Application in Automotive Turbocharger Turbine Volute Casing

The effect of different gloss levels on in-line monitoring of the thickness of printed layers by NIR spectroscopy

Quantitative determination of degree of conversion in photocured poly(urethane‐dimethacrylate)s by Fourier transform infrared spectroscopy

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