Vpliv staranja na mehanske lastnosti smolno vezanih brusov s korundnimi in SiC zrni : doktorska disertacija

slovenian

doktorska dela

2016

Univerza v Mariboru, Fakulteta za kemijo in kemijsko tehnologijo

The doctoral dissertation seeks to identify the manner in which ageing affects the mechanical and functional properties of resin-bonded grinding wheels with aluminium oxide and silicon carbide in certain time series based on the tests performed. The measurements provided the basis for the design of a temporal model of changes. The regularity of the approach used in the set research concept, which provided reliable and reproducible measurements, was confirmed with an assessment of the value of the Weibull modulus. Furthermore, the influence of humidity as the most likely cause for a steep downgrade in the mechanical properties of grinding wheels was examined and identified. Within that context, the system of forced, i.e. accelerated ageing of grinding wheels (additional humidification) was used under special atmospheric conditions. In the continuation, model mechanisms for changing microstructures during ageing were produced based on the microstructure characterization of grinding wheels that were exposed to different thermo mechanical impacts. These confirmed the most likely cause for ageing as established empirically and therewith related changes to the mechanical properties of grinding wheels. The findings were confirmed with a reversible thermal treatment process. Furthermore, the findings are useful in practice, i.e. in the process of manufacturing grinding wheels, allow for improvements to mechanical properties and, most of all, considerably slow down the ageing process, thus giving such products higher added value.

07.08.2023