RT Journal Article
SR Electronic
A1 Lysoňková, Irena
A1 Svobodová, Jaroslava
A1 Lattner, Michal
T1 The Influence of Thermal Load on Composite Coating PTFE
JF Manufacturing Technology Journal
YR 2018
VO 18
IS 5
SP 775
OP 780
DO 10.21062/ujep/176.2018/a/1213-2489/MT/18/5/775
UL https://journalmt.com/artkey/mft-201805-0014.php
AB This article deals with the thermal stability of the PTFE coating and the composite coating composed with the PTFE matrix and titanium dioxide particles. These coatings have application in production of aluminium moulds in the automotive industry, specifically in the vulcanization of rubber materials. The first type of coating (PTFE coating) is already applied in the production and thanks to its application on the Al mould surface, the maintenance interval was increased by up to 400% compared to the uncoated state. Vulcanization of rubber compounds usually take place at a temperature 150 - 170°C. This temperature can be increased after addition of additives to a temperature 220°C. For this reasons, there is the research focused on degradation of these coatings at various thermal loads. Thermal stability was tested on coatings - PTFE a PTFE + TiO2 - applied on aluminium substrate (type Al - Si). Experimental samples were loaded at temperatures 150°C, 200°C, 250°C, 300°C, 350°C, 400°C a 500°C at a time 30 minutes and 60 minutes. The samples after thermal load were performed to tribometric analysis, and to the surface roughness measurement of selected parameters. The samples were also evaluated from the point of view of surface morphology and state of the surface with SEM and EDS analysis.