Applicability of polymer-ceramic composite coatings to repair metal components
Mier González, Raquel (2020)
Mier González, Raquel
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020070219486
https://urn.fi/URN:NBN:fi:amk-2020070219486
Tiivistelmä
The aim of this thesis was to study the applicability of polymer-ceramic composite coatings to replace metallic coatings in repairing of metal components. In the literature part, previous studies about composites consisting of a polymer matrix reinforced with micro-sized ceramic particles were reviewed. However, few studies were found and it seemed that these studies handled a wear type or an environment different from this study. This study focused on coatings reinforced with particles larger than 1 mm, which are used in the harshest wear environments.
In the experimental part of this thesis, different commercial epoxy-ceramic composite coatings (Belzona 1811, ARC MX1 and ARC BX2) and an unreinforced polyurethane coating (Belzona 2121) were examined. A pull-off test was performed using a Positest AT-A Automatic device to measure the adhesion strength of these coatings to the substrate. The abrasive wear resistance was measured with a Taber abraser and the erosive wear resistance was measured with a high-speed slurry-pot type erosion tester. For purposes of comparison, the wear resistance of three metal materials (Ni-Hard cast iron, Raex 400 wear-resistant steel and structural steel S355) was included.
Based on the tests performed, it was observed that both epoxy-ceramic coatings Belzona 1811, ARC MX1 and ARC BX2, as well and polyurethane-based Belzona 2121 coating performed well in Taber wear test, when the type of wear was purely sliding abrasion without any impacts. On the other hand, epoxy-ceramic coatings did not perform well under slurry erosion while polyurethane-based coating did. The pull-off test results showed that epoxy-ceramic coatings greatly outperformed polyurethane-based coating and that conditioning the surface with a primer layer in ARC MX1 clearly improved adhesion. The application of these coatings to the substrate was relatively easy and did not require any special skill or equipment.
In the experimental part of this thesis, different commercial epoxy-ceramic composite coatings (Belzona 1811, ARC MX1 and ARC BX2) and an unreinforced polyurethane coating (Belzona 2121) were examined. A pull-off test was performed using a Positest AT-A Automatic device to measure the adhesion strength of these coatings to the substrate. The abrasive wear resistance was measured with a Taber abraser and the erosive wear resistance was measured with a high-speed slurry-pot type erosion tester. For purposes of comparison, the wear resistance of three metal materials (Ni-Hard cast iron, Raex 400 wear-resistant steel and structural steel S355) was included.
Based on the tests performed, it was observed that both epoxy-ceramic coatings Belzona 1811, ARC MX1 and ARC BX2, as well and polyurethane-based Belzona 2121 coating performed well in Taber wear test, when the type of wear was purely sliding abrasion without any impacts. On the other hand, epoxy-ceramic coatings did not perform well under slurry erosion while polyurethane-based coating did. The pull-off test results showed that epoxy-ceramic coatings greatly outperformed polyurethane-based coating and that conditioning the surface with a primer layer in ARC MX1 clearly improved adhesion. The application of these coatings to the substrate was relatively easy and did not require any special skill or equipment.