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## Surface modification by flame spraying of composite coatings and comparison of abrasion resistance with S355 and HARDOX 400 steels

### Natalia Boćkowska

#### Abstract

The subject of the work is surface modification by flame spraying of composite coatings and comparison of abrasion resistance with S355 and HARDOX 400 steels. The work consists of three main elements: analysis of the state of the problem, spraying of coatings and then own research. The first part of the paper concerns the review of literature on surfaces. It begins with a general definitione and then describes the concepts related to the coating - types and methods of manufacturing technological surface layers. In this part of the paper other terms related to the surface are also explained. The next part presents the process of flame spraying with the use of various powders. The whole spraying process is described along with the parameters, materials and equipment used. Samples of two steels - S355 and HARDOX 400 - were sprayed. Some of them were melted after the spraying process. Our own research is a scientific part, on the basis of which it was possible to determine the abrasion resistance of individual coatings made of powders 349 - 456 NiCrBSi and aluminum oxide. The wear and tear of coatings was tested in accordance with ASTM G65. The samples were subjected to macroscopic and microscopic tests, microhardness measurements and SEM structure examination. Macroscopic investigations allowed to determine the differences in the roughness of the sprayed coatings and to change the colour of the newly formed coating depending on the powder used. The observation of the microstructure allowed to determine that the obtained structure is inhomogeneous and layered, with carbides of various sizes and porosity. The porosity of the coatings depends on the material that was used during spraying. Microhardness measurements showed that the coatings sprayed have a microhardness about 250 µm - 300 µm higher than that of the native material. The subcoating appearing in aluminum oxide coated samples has low microhardness. The use of a scanning microscope allowed for more accurate observation of the surface and morphology of the samples. Thanks to this microscope it was possible to precisely determine the chemical composition of the analysed samples.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Natalia Boćkowska (FPE) Natalia Boćkowska,, Faculty of Production Engineering (FPE)
Title in Polish
Modyfikacja powierzchni przez natryskiwanie płomieniowe powłok kompozytowych i porównanie odporności na ścieranie ze stalami S355 i HARDOX 400
Supervisor
Jerzy Jakubowski (FPE/IoMP) Jerzy Jakubowski,, The Institute of Manufacturing Processes (FPE/IoMP)Faculty of Production Engineering (FPE)
Certifying unit
Faculty of Production Engineering (FPE)
Affiliation unit
The Institute of Manufacturing Processes (FPE/IoMP)
Study subject / specialization
, Zarządzanie i Inżynieria Produkcji
Language
(pl) Polish
Status
Finished
Defense Date
07-02-2019
Issue date (year)
2019
Reviewers
Andrzej Kolasa (FPE/IoMP) Andrzej Kolasa,, The Institute of Manufacturing Processes (FPE/IoMP)Faculty of Production Engineering (FPE) Jerzy Jakubowski (FPE/IoMP) Jerzy Jakubowski,, The Institute of Manufacturing Processes (FPE/IoMP)Faculty of Production Engineering (FPE)
Keywords in Polish
Natryskiwanie płomieniowe, powłoka, mikroskop, twardościomierz.
Keywords in English
Flame spraying, coating, microscope, hardness tester.
Abstract in Polish
File
• File: 1
Praca_inżynierska_1111744.pdf
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Local fields
Identyfikator pracy APD: 31943

Uniform Resource Identifier
https://repo.pw.edu.pl/info/bachelor/WUT8686f8d3a5bb47b79ec5949fa0b3d561/
URN
urn:pw-repo:WUT8686f8d3a5bb47b79ec5949fa0b3d561

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