Browsing by Subject "microwaves"

Now showing 1 - 3 of 3

Access status: Open Access ,
An assessment of the effectiveness of physical curing methods of molding sand bonded by binders based on starch and aluminosilicates
(2015) Kaczmarska, Karolina; Grabowska, Beata; Drożyński, Dariusz; Kurleto, Żaneta; Szymański, Łukasz
In this study, the effectiveness of curing methods by conventional heating and innovative microwave curing were compared, based on the results of determining molding sand selected properties such as permeability, tensile strength, and wear resistance. The tested molding sand used for our research was a composition of silica sand with a commercial binder in the form of Albertine F/1 (Hüttenes Albertus). This binder is a mixture of water-swellable starch derivatives and aluminosilicates. Binding in the molding sand occurred via solvent evaporation from the samples (water).The obtained results showed a dependence of molding sand properties and selected methods of physical cure, especially after one and four hours of cured-sample storage. However, after 24 hours of sample storage (as apparent from the analysis of the obtained results), both curing methods used were almost equally effective, and marked differences in the molding sand properties were located in the range of measurement uncertainty. Using electromagnetic waves in the microwave range made it possible to significantly reduce the time of curing as well as the energy consumption of the drying process.
Access status: Open Access ,
Determination of binder content in traditional sandmixes by microwave method
(AGH University of Science and Technology Press, 2017) Nowak, Daniel
This paper presents preliminary research on the possibility of determining the binder content in traditional sandmixes by the microwave method. The research included examinations of three kinds of bentonite. The presented measurements were carried-out with the use of a special stand - the so-called slot line. The concentration of the binder in molding sand was determined on the grounds of measurements of a parameter, i.e., absorbed power or output power of the electromagnetic wave. One of the main advantages of the suggested new method is the short time of the measurement.
Access status: Open Access ,
The Influence of Modified Inorganic Binders Intended for 3D Printing on Selected Properties of Thermally Cured Moulding Sands – Conventionally and with Microwaves
(AGH University Press, 2026) Halejcio, Dawid M.; Major-Gabryś, Katarzyna
This study determined the impact of thermal curing on the basic properties of moulding compounds made with commercial inorganic binders and binders based on them, modified for use in 3D printing technology (Binder Jetting). Two inorganic binders based on sodium silicate and a binder based on aluminosilicates were tested. As part of the work, the parameters for thermal curing of the mixtures were selected: for curing in a dryer, the best properties were obtained for mixtures containing 2.0 p.p.w. of binder cured for 10 min at 160°C. In the case of microwave curing, the best properties were obtained for moulding sands containing 2.0 p.p.w. of binder cured for 6 min at a device power of 800 W. The tests showed that the basic properties of moulding compounds with binders developed on the basis of commercial binders for use in 3D printing technology, thermally cured in a dryer, do not differ significantly from the properties of compounds with commercial binders. In the case of microwave curing, a reduction in the strength of compounds with new binders was observed in relation to compounds with classic binders. Thermal deformation tests of compounds with classic and modified binders confirmed the typical behavior observed for inorganic systems. It was proven that new, modified inorganic binders developed for 3D printing of moulds and cores using Binder Jetting technology can be used as binding materials in thermally cured moulding sands. Both thermal curing methods were assessed as suitable for curing moulding compounds with new binders.