Abstract
The basic prerequisite for obtaining the coating of good quality is the production of a layer without the occurrence of surface defects. A possible solution to the occurrence of defects on the functional surface of the form is the application of a polytetrafluoroethylene (PTFE)-based coating. The coating helps to reduce surface roughness and “smooth” defects like pores and micro-shrinkage. For this reason, a new type and methodology of the coating were prepared to achieve more production cycles between the individual cleaning processes during the production of a tire. The subject of the study was the analysis of surface-applied micro-coatings, including the analysis of chemical composition by using energy-dispersive X-ray (EDX) and microstructure in the area of coatings. Detailed microstructural characterization of Alfipas 7818 and Alfiflon 39 and its imaging of surface structures were studied using atomic force microscopy. To examine the surface layer of the coatings, metallographic specimens of cross-sections (by means of a mold) were prepared and examined by light and electron microscopy. This new multilayer micro-coating with a thickness of 20–25 μm has been found to prevent form contamination during tire production and to extend production cycles by 200–400% between process cleanings. This finding was actually tested in the production of tires in the environment of a large manufacturing company.
Highlights
Accepted: 19 January 2021Micro-coating technology is a technological process in which thin layers with a thickness of 1–10 mm are applied [1]
A linear analysis of the surface of basic material had been made, which monitored the concentration of oxygen, carbon, fluorine and zirconium elements
A linear energy-dispersive X-ray (EDX) analysis of the individual elements located in this area was performed
Summary
Micro-coating technology is a technological process in which thin layers with a thickness of 1–10 mm are applied [1]. The whole process consists of applying a thin layer to the substrate material, which is referred to as the substrate. The technology of micro-coating material immersed in coated preparations was used. A thin layer of coating forms a barrier to the substrate material against the chemical and mechanical wear of the tool. This method of multilayer micro-coating is used mainly for the coating of light metals and, in the case of tire production, prevents form contamination during the production, significantly prolonging production cycles between individual cleanings
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