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

Gyarmati, Gábor; Budavári, Imre; Fegyverneki, György; Varga, László

doi:10.1016/j.heliyon.2021.e07624

Cited by 5 publications

(3 citation statements)

References 39 publications

(47 reference statements)

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“…The influence of sand quality on the tensile strength and thermal distortion of chemically bonded sand cores is investigated (Gyarmati et al, 2021). Material testing and XRD analysis to examine the sulfate resistance behavior of granite sand as fine aggregate in concrete (Arivumangai et al, 2020).…”

Section: Figure 1 Map Of Pamekasan Madura Regencymentioning

confidence: 99%

XRF and XRD Testing for Sand Mineral Content Identification at Talang Siring Beach

Ariyanto

Joni

Yunanto

2023

Edu. Jur. Pend. Fis

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In the Talang siring tour of the Pamekasan district, numerous illegal mining operations along the coast for sale and personal use produce building materials with low economic value. However, if the sand is processed further, it will produce materials with high technology utilization and economic value. This research is a preliminary investigation into converting sand into high-value minerals to be utilized economically. Using X-Ray Fluorescence (XRF) and X-Ray Diffraction (XRD) experiments, this study aims to determine the sand's mineral content in the Talang Siring tourist area in Pamekasan Regency. Initial identification is the XRF test function for analyzing sand's chemical elements and composition. The purpose of XRD is to analyze the crystal structure and correlate the results with Macth and origin software based on the XRF results. The results of the XRF test indicated that Silicone had the highest concentration of minerals at 63.8%, followed by Calcium at 29.4% and Iron at 2.45%. The XRD test results indicated that the sand's mineral composition was qualitatively SiO2 90%, CaCO3 8%, Iron 1%, and the remainder 1%.

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Section: Figure 1 Map Of Pamekasan Madura Regencymentioning

confidence: 99%

XRF and XRD Testing for Sand Mineral Content Identification at Talang Siring Beach

Ariyanto

Joni

Yunanto

2023

Edu. Jur. Pend. Fis

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“…Impurities on the surface of the foundry silica sand grains, such as potash, alkali feldspars, soda, have a detrimental effect on the adhesive strength between the binder bridge and sand grains, as well as the cohesive strength of the binder bridges. 46,47,51 Because of that, it is very important to analyze the characteristics of the refractory sand.…”

Section: Preliminary Tests Of the Base Sandmentioning

confidence: 99%

The Influence of Acid Hardener on the Strength and Hot-Distortion Properties of No-Bake Sand Cores

2021

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In this research work, the effects of different amounts of acid hardener (30%, 40%, 60%, 80% weighted to the resin) on the hardening characteristics and hot-distortion properties of no-bake furan and no-bake phenolic bonded sand cores were studied. Bending tests were conducted on test bars with storage times of 1, 2, 3, 5, 7, 24h. Hot-distortion tests were carried out on specimens with storage times of 4h and 24h. The bending tests revealed that in the case of the furan binder system, the acid hardener is best utilized in terms of higher bending strength, in an amount of 40–60%, while in the case of the phenolic binder system, the amount of 60–80% acid hardener resulted in higher bending strength of the sand specimens. Too low (30%) acid hardener (catalyst) level produced low bending strength. Too high (80%) amount of acid hardener decreased the strength of the no-bake furan sand samples, and as can be seen from the SEM analysis, it damaged the binder bridges between the sand grains. The hot-distortion tests showed that there is a correlation between the catalyst content and the max. Deformation of the samples both in the furan and in the phenolic no-bake sand cores, which can be described with a maximum curve. Increasing the acid hardener changes the thermoplastic behavior of the phenolic resin, thus the binder bridges become more rigid and brittle. The acid hardener above 40% decreased the thermal stability of the furan and phenolic bonded test pieces. The research work also revealed significant differences between the specimens made with furan and phenolic binder and the effect of the storage time in terms of the bending strength and hot-distortion properties.

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“…Silica sands tend to contain various mineral contaminants such as potash, alkali feldspars and soda, which may occur as separate particles or as a layer on the surface of the silica grains. These contaminants can significantly reduce the adhesion between the binder and the sand grain, as well as reduce the cohesion and strength of the binder bridges [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Composition of Hybrid Sands on the Change in Thermal Expansion

et al. 2022

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In the foundry industry, silica sands are the most commonly used type of sands for the production of sand foundry moulds using various types of binders. Their greatest disadvantage is their significant volume changes at elevated temperatures, which are associated with the formation of many foundry defects from stress, such as veining, and thus have a direct influence on the final quality of the casting. In the case of non-silica sands and synthetic sands, the volume stability is more pronounced, but this is accompanied by a higher purchase price. Therefore, a combination of silica sand and synthetic sand CERABEADS is considered in order to influence and reduce the thermal expansion. The hybrid mixtures of sands, and their most suitable ratios, were evaluated in detail using sieve analysis, log W and cumulative curve of granularity. It was found that the addition of 50% CERABEADS achieves a 32.2% reduction in dilatation but may increase the risk of higher stresses. The measurements showed a significant effect of the granulometric composition of the sand on the resulting thermal expansion, where the choice of grain size and sorting can achieve a significant reduction in dilatation with a small addition of CERABEADS.

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

Cited by 5 publications

References 39 publications

XRF and XRD Testing for Sand Mineral Content Identification at Talang Siring Beach

XRF and XRD Testing for Sand Mineral Content Identification at Talang Siring Beach

The Influence of Acid Hardener on the Strength and Hot-Distortion Properties of No-Bake Sand Cores

Effect of the Composition of Hybrid Sands on the Change in Thermal Expansion

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