@ARTICLE{Bobrowski_A._Thermal_2018, author={Bobrowski, A. and Drożyński, D. and Jakubski, J. and Szumera, M. and Kaczmarska, K. and Grabowska, B.}, volume={vol.18}, number={No 4}, journal={Archives of Foundry Engineering}, pages={93-98}, howpublished={online}, year={2018}, publisher={The Katowice Branch of the Polish Academy of Sciences}, abstract={The paper presents the results of an investigation of the thermal deformation of moulding sands with an inorganic (geopolymer) binder with a relaxation additive, whose main task is to reduce the final (residual) strength and improves knocking-out properties of moulding sand. The moulding sand without a relaxation additive was the reference point. The research was carried out using the hot-distortion method (DMA apparatus from Multiserw-Morek). The results were combined with linear deformation studies with determination of the linear expansion factor (Netzsch DIL 402C dilatometer). The study showed that the introduction of relaxation additive has a positive effect on the thermal stability of moulding sand by limiting the measured deformation value, in relation to the moulding sand without additive. In addition, a relaxation additive slightly changes the course of the dilatometric curve. Change in the linear dimension of the moulding sand sample with the relaxation additive differs by only 0.05%, in comparison to the moulding sand without additive.}, type={Artykuły / Articles}, title={Thermal Deformation of Moulding and Core Sands with an Inorganic Binder Containing a Relaxation Additive}, URL={http://www.czasopisma.pan.pl/Content/109215/PDF/AFE%204_2018_18.pdf}, doi={10.24425/afe.2018.125175}, keywords={Moulding sand, thermal deformation, Inorganic binder, Geopolymer, Dilatometric studies}, }