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Evaluation of the Possibility of Applying Thermal Barrier Coatings to AlSi7Mg Alloy Castings

Marek Mróz Patryk Rąb
Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 104-109 | DOI: 10.24425/afe.2023.146668
Keywords thermal barrier coating aluminum-silicon alloy atmospheric plasma spraying
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Abstract

This paper analyses the possibility of applying thermal barrier coatings (TBCs) onto a substrate made of the AlSi7Mg alloy, intended for, among other things, internal combustion engine components. Engine components made of aluminum-silicon alloys, especially pistons and valve heads, are exposed to high temperature, pressure and thermal shock resulting from the combustion of the fuel-air mixture. These factors cause degradation of these components and can lead to damage. To minimize the risk of damage to engine components caused by heat stress, one way is to apply TBCs. Applying TBCs coatings to engine components improves their durability, increases power output and reduces fuel consumption. The research scope includes the application of an Al2O3-TiO3 coating via the APS (Air Plasma Spraying or Atmospheric Plasma Spraying) method onto a substrate of the AlSi7Mg alloy, analysis of the microstructure and chemical composition of the substrate and coating material, and assessment of the quality of the coating's bond with the AlSi7Mg alloy substrate using the scratch test method.
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Bibliography

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Authors and Affiliations

Marek Mróz
ORCID: ORCID
Patryk Rąb
ORCID: ORCID

High temperature resistance of silicide-coated niobium

Radosław Szklarek Tomasz Tański Bogusław Mendala Marcin Staszuk Łukasz Krzemiński Paweł Nuckowski Kamil Sobczak
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 5 | e137416 | DOI: 10.24425/bpasts.2021.137416
Keywords niobium silicide thermal barrier coating CVD high temperature oxidation resistance
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Abstract

In this paper, thermal oxidation resistance of silicide-coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. Pure niobium specimens were coated using the pack cementation CVD method. Three different silicide thickness coatings were deposited. Thermal oxidation resistance of the coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. All samples that passed the test showed their ability to stabilize the temperature over a time of 30 s during the thermal test. The rise time of substrate temperature takes about 10 s, following which it keeps constant values. In order to assess the quality of the Nb-Si coatings before and after the thermal test, light microscopy, scanning electron microscopy (SEM) along with chemical analysis (EDS), X-ray diffraction XRD and Vickers hardness test investigation were performed. Results confirmed the presence of substrate Nb compounds as well as Si addition. The oxygen compounds are a result of high temperature intense oxidizing environment that causes the generation of SiO phase in the form of quartz and cristobalite during thermal testing. Except for one specimen, all substrate surfaces pass the high temperature oxidation test with no damages.
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Bibliography

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Authors and Affiliations

Radosław Szklarek
1 2 3
Tomasz Tański
1
ORCID: ORCID
Bogusław Mendala
1
Marcin Staszuk
1
ORCID: ORCID
Łukasz Krzemiński
1
Paweł Nuckowski
1
Kamil Sobczak
3
  1. Silesian University of Technology, ul. Akademicka 2A, 44-100 Gliwice, Poland
  2. Spinex Spinkiewicz Company, Klimontowska 19, 04-672 Warsaw, Poland
  3. Łukasiewicz Research Network – Institute of Aviation, al. Krakowska 110/114, 02-256 Warsaw, Poland

Automatic defect detection and characterization by thermographic images based on damage classifiers evaluation

Giuseppe Dinardo Laura Fabbiano Rosanna Tamborrino Gaetano Vacca
Metrology and Measurement Systems | 2020 | vol. 27 | No 2 | 219-242 | DOI: 10.24425/mms.2020.132771
Keywords thermography non-destructive testing thermal barrier coatings image segmentation uncertainty analysis
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Abstract

In the framework of non-destructive evaluation (NDE), an accurate and precise characterization of defects is fundamental. This paper proposes a novel method for characterization of partial detachment of thermal barrier coatings from metallic surfaces, using the long pulsed thermography (LPT). There exist many applications, in which the LPT technique provides clear and intelligible thermograms. The introduced method comprises a series of post-processing operations of the thermal images. The purpose is to improve the linear fit of the cooling stage of the surface under investigation in the logarithmic scale. To this end, additional fit parameters are introduced. Such parameters, defined as damage classifiers, are represented as image maps, allowing for a straightforward localization of the defects. The defect size information provided by each classifier is, then, obtained by means of an automatic segmentation of the images. The main advantages of the proposed technique are the automaticity (due to the image segmentation procedures) and relatively limited uncertainties in the estimation of the defect size.

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Authors and Affiliations

Giuseppe Dinardo
Laura Fabbiano
Rosanna Tamborrino
Gaetano Vacca

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