Comparison of a new, green foundry binder with conventional foundry binders

Fox, John T.; Cannon, Fred S.; Brown, Nicole R.; Huang, He; Furness, James C.

doi:10.1016/j.ijadhadh.2011.11.011

Cited by 46 publications

(29 citation statements)

References 24 publications

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“…These enhance the elasticity of the molding and core sand. Previous studies have confirmed the positive influence of collagen plus alkali silicate [15] on the properties of molding sand or polycaprolactone [18] on the properties of molding sand with phenol-furfural resin. Another method for improving the strength properties of molding sand at high temperatures consists of applying coatings on the cores.…”

Section: Introductionmentioning

confidence: 75%

“…However, at the moment of writing the article, this method is not standardized nor determined by the relevant standards. As a result of the non-standardized measuring method, researchers are able to use a "hot-" or "thermal-" distortion apparatus to study the phenomena of deformation for various purposes as well as introduce them by their modifications and improvements, like in the DMA Hot Distortion Tester [11], Hot Distortion Plus® [14] method, or Hot Distortion Tester for the samples sized 5.24 × 2.54 × 1.27 cm described in [15].…”

Section: Introductionmentioning

confidence: 99%

“…As a result of the high temperature and mechanical stress, negative phenomena occur in the molding sand: thermal deformation, thermal and mechanical destruction, and thermoplasticity. These may damage the mold or core structure, which depend on the molding mixture components [11][12][13][14][15][16][17]. The extent of the distortions that emerged during the pouring of the liquid metal may be modified by means of special plasticizers added to the binders.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Density Degree and Grade of Inorganic Binder on Behavior of Molding Sand at High Temperature

Stachowicz

Paduchowicz

Granat

2017

jcme

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This paper discusses the impact of high temperatures (up to 900°C) on molding and core sand with inorganic binders selected from among the group of unmodified grades of hydrated sodium silicate (water-glass). Molding sands with medium quartz sand were made under laboratory conditions and compacted at the different energy inputs necessary for obtaining various apparent densities (ϱ 0 ). Due to the different composition and apparent density of molding mixtures hardened via microwaves at a frequency of 2.45 GHz, it was possible to assess their deformation (L) at a high temperature above the binder's eutectic temperature. For this purpose, an apparatus for hot distortion tests was used whose construction and equipment allows us to measure the thermoplastic deformations in molding sand in many aspects; i.e., in its time of annealing. The article proposes new possibilities of interpreting the hot distortion phenomena in comparative studies of molding materials and mixtures. The application of this new measurement method revealed the differences between molding mixtures made with five inorganic binders with a molar module ranging from 2.0 to 3.4 and apparent density ranging from 1.34 to 1.57 g/cm 3 . It was established that distortions under the influence of high temperatures last the longest in molding sand with a binder with the highest molar module (3.4). Research also revealed that the density of molding sand is significant for increasing/decreasing the rate of thermoplastic deformations following the heating of samples only if the molding sand includes binders with a molar module of between 3.0 to 3.4. For molding sand with binders with molar modules from 2.0 to 2.5, it was established that this is excessively susceptible to thermoplastic deformation.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Density Degree and Grade of Inorganic Binder on Behavior of Molding Sand at High Temperature

Stachowicz

Paduchowicz

Granat

2017

jcme

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“…Therefore, the thermal degradation of the binder takes place with the limited participation of oxygen, and the mechanism for the degradation reaction may be considered to be mixed [4,12,13]. Moreover, at a distance of 5-30 mm from the cast-mould interface, a temperature of between 300 and 600°C is maintained for approximately 1 h. This temperature range may be conducive to many reactions, mainly to degradation, including cyclisation and dehydrogenation [12]. Moreover, the dynamic process of the emission of gaseous products of degradation and their increased pressure on the mould may also cause localised increases in pressure which are conducive to degradation reactions.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis in foundry technology

Grabowska

Hodor²,

Kaczmarska

et al. 2017

J Therm Anal Calorim

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In this study, a polymer composition of poly (acrylic acid) and dextrin (PAA/D) cross-linked with microwave radiation, belonging to the new BioCo group of environmentally friendly foundry binders, was subjected to thermal analysis (TG-DTG-DSC, TG-MS, TG-IR) in a temperature range of 20-600°C. A thermal analysis of PAA/D compositions enables the determination of a temperature range at which the composition is not susceptible to thermal degradation and thus does not lose its binding properties. The study showed that the process of thermal degradation of PAA/D is complex and multi-stage (TG-DTG-DSC). Within a temperature range of 20-250°C, physical and chemical changes take place associated with the evaporation of the water fraction of the solvent (20-100°C), next with the evaporation of the water hydration and finally with intermolecular dehydration reactions (100-250°C). Above a temperature of 300°C, the decomposition of the polymer chains takes places, and thereafter, the intensive degradation of PAA/D occurs together the creation of gaseous substances, primarily low molecular weight inorganic (CO 2 , H 2 O, CO) and organic compounds, including methane (TG-IR, TG-MS).

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“…However, there is a question as to how it behaves under the influence of sudden increases in temperature during the production of castings. Particularly important are the issues associated with determining the process of degradation and destruction [6,7]. In addition, another important issue is the determination of the influence of gas products created during thermal destruction on the quality of the final cast as well as on the environment [8,9].…”

Section: Introductionmentioning

confidence: 99%

TG-DTG-DSC, FTIR, DRIFT and Py-GC-MS studies of thermal decomposition for poly(sodium acrylate)/dextrin (PAANa/D) – new binder BioCo3

Grabowska

Kaczmarska

Bobrowski

et al. 2017

jcme

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TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS studies have been conducted to determine the effect of the thermal decomposition conditions and structure of foundry binder BioCo3 in the form of a composition poly(sodium acrylate)/dextrin (PAANa/D) on the progress of degradation in terms of processes occurring in foundry sands in contact with liquid metal. TG-DTG-DSC curves of the composition allowed us to determine the temperature range in which they do not undergo degradation, by which they do not lose their binding properties. With temperature increasing, physical and chemical changes occur that are related to the evaporation of solvent water (20-110°C), followed by the release of constitution water, and finally intermolecular dehydration (110-230°C). In this temperature range, processes that are mainly reversible take place. Within a temperature range of 450-826°C, polymer chains are decomposed, including the decomposition of side chains. Within a temperature range of 399-663°C, polymer composition decomposition can be observed (FTIR, DRIFT), and gas products are generated from this destruction (Py-GC-MS).

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Comparison of a new, green foundry binder with conventional foundry binders

Cited by 46 publications

References 24 publications

Impact of Density Degree and Grade of Inorganic Binder on Behavior of Molding Sand at High Temperature

Impact of Density Degree and Grade of Inorganic Binder on Behavior of Molding Sand at High Temperature

Thermal analysis in foundry technology

TG-DTG-DSC, FTIR, DRIFT and Py-GC-MS studies of thermal decomposition for poly(sodium acrylate)/dextrin (PAANa/D) – new binder BioCo3

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