Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate

Stachowicz, M.; Kamiński, M.; Granat, K.; Pałyga, Ł.

doi:10.1515/afe-2017-0058

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…An alternative solution for the physical hardening of hydrated sodium silicate is the use of microwaves. Own research [13] and literature data [17,18] have shown that, at a lower content of binder, this technology enables obtaining moulding sands with a strength higher than the strength of the sands hardened with an ester hardener (Fig. 3).…”

Section: Selection Of Moulding Sands For Disposable Moulds Used In Ab...mentioning

confidence: 99%

Archives of Foundry Engineering

Puzio

Kamińska

Major-Gabryś

et al. 2019

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The aim of this study is to demonstrate the possibility of using moulds made from the environmentally friendly sands with hydrated sodium silicate in modified ablation casting. The ablation casting technology is primarily intended for castings with diversified wall thickness and complex shapes made in sand moulds. The article presents the effect of binder content and hardening time on the bending strength R g u of moulding sands with binders based on hydrated sodium silicate hardened by microwave technology. The aim of the research was to develop an optimal sand composition that would provide the strength necessary to make a mould capable of withstanding the modified ablation casting process. At the same time, the sand composition should guarantee the susceptibility of the mould to the destructive action of the ablation medium, which in this case is water. Tests have shown that microwave hardening provides satisfactory moulds' strength properties even at a low binder content in the sand mixture.

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Section: Selection Of Moulding Sands For Disposable Moulds Used In Ab...mentioning

confidence: 99%

Archives of Foundry Engineering

Puzio

Kamińska

Major-Gabryś

et al. 2019

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“…The changes that occur on the grain surface of the chromite matrix are presented in [ 18 ]. The authors found that, as the temperature increases, the grain matrix-formed layer of iron oxides becomes less and less bonded to the grain, resulting in easier chipping of these areas during the processing of moulding sands.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Reclamation of Spent Moulding Sand on Chromite Sand Matrix; Removal of Alkali-Phenolic Binder

et al. 2023

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The foundry industry generates large amounts of waste when casting metal into sand moulds. An important issue is the activities that are related to the re-recovery of the grain matrix (the main component of the moulding sand) for realising subsequent technological cycles. This process is particularly important in the case of the expensive chromite matrix that is necessary for use in manganese steel casting. The effects of the reclamation treatments of spent alkali-phenolic binder sand were evaluated by scanning electron microscopy with EDS, analysing the chemical composition in micro areas and proving the loss of binder on the surfaces of the matrix grains. Tests were also performed using the main criteria for evaluating a reclaimed organic binder: sieve analysis and ignition loss. A thermogravimetric analysis study was performed to assess the change in the chromite character of the grain matrix under the influence of temperature. The effects of the reclamation measures were verified by making moulding compounds on a matrix of reclaimed sand and a mixture of reclaimed and fresh sand. The tests and analyses that were carried out indicated the direction of an effective method for reclaiming used alkali-phenolic binder masses and the extent of the proportion of the regenerate in moulding sand in order to maintain the relevant technological parameters of the moulding sand.

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“…Microwave hardening with fast and uniform features is used to improve the efficiency of the sodium silicate sands [1]. The strength of moulding sands is enhanced on the premise of a significant decrease in the amount of sodium silicate.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Wang,

Gao,

Yang

et al. 2022

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The sodium silicate sands hardened by microwave have the advantages of high strength, fast hardening speed and low residual strength with the lower addition of sodium silicate. However, the sodium ion in the sands will absorb moisture from the atmosphere, which would lead to lower storing strength, so the protection of a bonding bridge of sodium silicate between the sands is crucial. Methyl silicone oil is a cheap hydrophobic industrial raw material. The influence of the addition amount of methyl silicone oil modifier on compressive strength and moisture absorption of sodium silicate sands was studied in this work. The microscopic analysis of modified before and after sodium silicate sands has been carried on employing scanning electron microscopy(SEM) and energy spectrum analysis(EDS). The results showed that the strength of modified sodium silicate sands was significantly higher than that of unmodified sodium silicate sands, and the best addition of methyl silicone oil in the quantity of sodium silicate was 15%. It was also found that the bonding bridge of modified sodium silicate sands was the density and the adhesive film was smooth, and the methyl silicone oil was completely covered on the surface of the sodium silicate bonding bridge to protect it.

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Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate

Cited by 4 publications

References 4 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

Mechanical Reclamation of Spent Moulding Sand on Chromite Sand Matrix; Removal of Alkali-Phenolic Binder

Archives of Foundry Engineering

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