Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Vasková, Iveta; Varga, László; Prass, Ingo; Dargai, Viktória; Conev, M.; Hrubovčáková, Martina; Bartošová, Marianna; Buľko, Branislav; Demeter, Peter

doi:10.3390/met10020235

Cited by 19 publications

(9 citation statements)

References 5 publications

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“…However, in case of castings that are not subject to further machining porosity has to be dealt with by production technology modification, best before the casting process [3]. However, the porosity minimization task is complicated and it requires taking into account the material chemical composition, casting temperatures, inoculation method, risers, as well as the mould proper material and design [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of the chill size on the porosity formation in ductile iron casting

Socha

FILIPEK

Gryc

et al. 2022

METAL 2022 Conference Proeedings

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This paper describes the numerical modelling of solidification of ductile iron castings intended for the shipbuilding industry. Numerical simulations we performed in the computer software MAGMASOFT ® . The purpose of numerical simulations was to predict solidification under defined casting conditions to verify whether the proposed production technology is adequate. Attention was focused mainly on the porosity occurrence in the casting, which is determined at a stated location using an ultrasonic test. Variants with different types of chills were simulated to determine their effect on the size of porosity. The results of these variants are presented in this paper. The variant with the best results was then recommended for production under operating conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of the chill size on the porosity formation in ductile iron casting

Socha

FILIPEK

Gryc

et al. 2022

METAL 2022 Conference Proeedings

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“…They present the results of permeability based on the outlet velocity of the measured samples and compare it with the simulated results of permeability. Vaskova et al [ 19 ] studied the effect of combining coarse sand with fine sand and reported a decrease in permeability with an increasing percentage of fines content. Their results show that after a certain amount of increased fines, the permeability did not reduce much for the sand mixtures.…”

Section: Introductionmentioning

confidence: 99%

On the Relation between the Gas-Permeability and the Pore Characteristics of Furan Sand

Sundaram

Svidró

et al. 2021

Materials

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Furan sand is one of the most commonly used chemically bonded molding materials in foundries across the world. It consists of a furfuryl alcohol-based resin and an acid-based liquid catalyst. When the molding material comes in contact with the molten metal, it undergoes a thermal shock accompanied by a certain release of volatile gases. In order to evacuate these gases, molds and cores should have optimal gas permeability values and proper venting by design. If the volatile compounds are not appropriately evacuated, they are prone to enter the melt before the first layer of solidified metal is formed which can lead to the formation of gas-related casting defects. Standard gas permeability measurements are commercially available tools used in the industry to compare and to quality control different sands, however, they only provide reference numbers without actual units. Permeability in a standard unit, m2, provides uniformity and helps the comparison of results from difference sources. In this paper, a new method using Darcy’s law (prevalent in earth sciences), was adapted to measure the gas-permeability of furan samples made of silica sand with various grain size distributions. The effect of grain size distribution on the gas-permeability of furan sand samples was studied. Gas-permeability values in m2 were then correlated with mercury-porosity measurement results to bring new light on the relation between pore size, pore volume and the permeability of molding materials.

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“…In this study, the properties of the base sand are considered. The granulometric properties (grain size distribution, grain shape) have an overwhelming effect on the binder demand, the flowability of the sand mixture during core shooting, and, in this way, on the bulk density, mechanical properties, and surface characteristics of the sand cores [ 10 , 25 , 26 ]. Another important factor is the impurity content of the sand, as silica sands tend to contain different minerals as contaminants, such as potash, alkali feldspars, soda, which can occur in the form of separate particles or as a layer on the surface of the silica grains.…”

Section: Introductionmentioning

confidence: 99%

The effect of sand quality on the bending strength and thermal distortion of chemically bonded sand cores

Gyarmati

Budavári

Fegyverneki

et al. 2021

Heliyon

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The quality of chemically bonded sand cores used during the manufacturing process of cast components is highly dependent on the properties of the sand, which constitutes the refractory base media of the core. One of the main advantages of the application of different types of sands as molding aggregates that after casting, they can be reclaimed and can be used again during core shooting. The properties of the sand, however, could be remarkably changed during the casting and reclamation processes. This study aims to investigate the effects of the properties of the base sand on the mechanical strength and thermal distortion properties of samples made from new and thermally reclaimed silica sand. For this purpose, particle size analysis, specific surface area, and loss on ignition measurements, as well as differential thermal analysis coupled with thermogravimetry, were executed on the base sands, and the sand grains were analyzed with scanning electron microscopy and X-ray diffraction. Test pieces were made with hot box and cold box technology for bending and hot distortion tests. It was found that by the utilization of reclaimed sand, cores with higher average bending strength and lower thermal deformation can be produced. These differences can be traced back to the more advantageous granulometric properties, lower impurity content, and lower thermal expansion of thermally reclaimed sand.

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Examination of Behavior from Selected Foundry Sands with Alkali Silicate-Based Inorganic Binders

Cited by 19 publications

References 5 publications

Influence of the chill size on the porosity formation in ductile iron casting

Influence of the chill size on the porosity formation in ductile iron casting

On the Relation between the Gas-Permeability and the Pore Characteristics of Furan Sand

The effect of sand quality on the bending strength and thermal distortion of chemically bonded sand cores

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