Measurement of Gas Evolution from PUNB Bonded Sand as a Function of Temperature

Samuels, Gregory James

doi:10.1007/bf03355525

Cited by 8 publications

(3 citation statements)

References 7 publications

(26 reference statements)

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“…It was confirmed that the sample without ceramic RCS had the largest mass loss at the same temperature, and the mass loss decreased as the ceramic RCS was added. Gas is emitted by pyrolysis of binder, a decrease in mass loss means the reducing gas emission volume [10][11]. Therefore, it can be determined that the artificial sand reduce the amount of emitted gas by pyrolysis of binder.…”

Section: Resultsmentioning

confidence: 99%

The Effect of the Artificial Sand on the Gas Emission for Aluminum Casting

Ha,

Kim,

Youn

et al. 2023

KEM

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The effect of artificial sand on the amount of core gas emission was examined. Mass loss by thermal decomposition of the binder was evaluated when resin-coated sand (RCS) with various amounts of artificial sand was exposed to high temperature. Compared to natural sand, the mass loss and temperature variation of artificial sand was reduced. It was confirmed that this is because the contact area between the two particles is reduced when the binder bridge is created between the foundry sands. Therefore, the surface morphology of the artificial sand has ragged surface, so that the heat conduction area is decreased.

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Section: Resultsmentioning

confidence: 99%

The Effect of the Artificial Sand on the Gas Emission for Aluminum Casting

Ha,

Kim,

Youn

et al. 2023

KEM

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“…They found that internal defects such as shrinkage cavities, shrinkage porosity, and impurity can affect the mechanical Considerable experimental research has been conducted on the gas generation of resin cores produced using different processes at different temperatures during the hightemperature decomposition of resin. Bargaoui et al [1][2][3] studied changes in the quality of resin sand with temperature, and the influence of oxidants on the crushability of resin sand using thermogravimetric analysis. However, this method can only analyze the quality changes of resin sand during the decomposition process, and does not consider the gas volume and pressure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Gas Release of 3D-Printed Furan Resin Sand Core during the Casting Process

Wang

Huang

et al. 2023

Materials

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In sand casting, gas porosity is a common defect that can result in decreased strength, leakage, rough surfaces, or other problems. Although the forming mechanism is very complicated, gas release from sand cores is often a significant contributor to the formation of gas porosity defects. Therefore, studying the gas release behavior of sand cores is crucial to solving this problem. Current research on the gas release behavior of sand cores mainly focuses on parameters such as gas permeability and gas generation properties, through experimental measurement and numerical simulation methods. However, accurately reflecting the gas generation situation in the actual casting process is difficult, and there are certain limitations. To achieve the actual casting condition, a sand core was designed and enclosed inside a casting. The core print was extended to the sand mold surface, with two types of core prints: hollow and dense. Pressure and airflow speed sensors were installed on the exposed surface of the core print to investigate the burn-off of the binder of the 3D-printed furan resin quartz sand cores. The experimental results showed that the gas generation rate was high in the initial stage of the burn-off process. The gas pressure quickly reached its peak in the initial stage and then decreased rapidly. The exhaust speed of the dense type of core print was 1 m/s, lasting for 500 s. The pressure peak of the hollow-type sand core was 1.09 kPa, and the exhaust speed peak was 1.89 m/s. The binder can be sufficiently burned off for the location surrounding the casting and the crack-affected area, so the burnt sand appears white, while the burnt core appears black due to insufficient burning of the binder because of isolation from the air. The gas generated by the burnt resin sand in contact with air was 30.7% less than that generated by the burnt resin sand insulated from the air.

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“…Their effect among others, is thermal destruction of the binder, which causes the emission of gases [1][2][3][4][5][6][7][8][9][10][11][12]. The composition of this gases and its harmfulness depends on many factors, mainly on the binder type (resin, hardener), molding sand composition (amount of binder, reclaim participation), contact time with high temperature to knocking out casting from mold [13,14].…”

Section: Introductionmentioning

confidence: 99%

TG/DTG/DTA, FTIR and GC/MS Studies of Oil Sand for Artistic and Precision Foundry with the Emission of Gases Assessment

Bobrowski

Żymankowska-Kumon

Drożyński

et al. 2017

Archives of Foundry Engineering

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The paper presents the results of thermoanalytical studies by TG/DTG/DTA, FTIR and GC/MS for the oil sand used in art and precision foundry. On the basis of course of DTG and DTA curves the characteristic temperature points for thermal effects accompanying the thermal decomposition reactions were determined. This results were linked with structural changes occurred in sample. It has been shown that the highest weight loss of the sample at temperatures of about 320°C is associated with destruction of C-H bonds (FTIR). In addition, a large volume of gases and high amounts of compounds from the BTEX group are generated when liquid metal interacts with oil sand. The results show, that compared to other molding sands used in foundry, this material is characterized by the highest gaseous emissions and the highest harmfulness, because benzene emissions per kilogram of oil sand are more than 7 times higher than molding sand with furan and phenolic binders and green sand with bentonite and lustrous carbon carrier.

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Measurement of Gas Evolution from PUNB Bonded Sand as a Function of Temperature

Cited by 8 publications

References 7 publications

The Effect of the Artificial Sand on the Gas Emission for Aluminum Casting

The Effect of the Artificial Sand on the Gas Emission for Aluminum Casting

Study on the Gas Release of 3D-Printed Furan Resin Sand Core during the Casting Process

TG/DTG/DTA, FTIR and GC/MS Studies of Oil Sand for Artistic and Precision Foundry with the Emission of Gases Assessment

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