The Influence of Glassex Additive on Properties of Microwave-Hardened and Self-Hardened Moulding Sands with Water Glass

Major-Gabryś, K.; Dobosz, S. M.; Jakubski, J.; Stachowicz, M.; Nowak, D.

doi:10.2478/v10266-012-0025-x

Cited by 6 publications

(10 citation statements)

References 1 publication

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“…In the hardening process carried out in the microwave radiation field of samples of moulding sands on the quartz matrix -bound by the PAA/CMS-Na compositionthe bending strength of 1.6 MPa is obtained already 1 h after finishing the radiation. The obtained strength level is sufficient in respect of the applicability reasons and comparable with values obtained by methods already applied -in practice -in the moulding sand technologies [29,30]. In addition, during 24 h of storing the hardened samples under surrounding conditions, their bending and compressive strength as well as friability are not worsening.…”

Section: Introductionsupporting

confidence: 65%

FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Part II

Grabowska

Sitarz

Olejnik

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The hardening process of moulding sands on quartz matrices bound by polymer binders containing carboxyl and hydroxyl groups can be carried out by using physical (microwave radiation, thermal holding) and chemical (Ca(2+) cations, glutaraldehyde) cross-linking agents. The highest hardening level obtain moulding sand samples containing binders in a form of the aqueous composition of poly(acrylic acid)/sodium salt of carboxymethyl starch (PAA/CMS-Na) within the microwave radiation field, for which the bending strength is of 1.6 MPa value even after 24h from ending the agent activity. The authors focused, in this study, on finding the reason of this effect. It was shown, by means of the FT-IR and FT-Raman spectroscopic methods, that the chemical adsorption process activated by microwaves plays an essential role. The applied microwaves activate the polar groups present in the polymer composition structure as well as the quartz crystals surfaces (silane groups). Then the chemical adsorption occurs in the binder-matrix system within the microwave radiation field and intermolecular lattices are formed with a participation of hydrogen bridges (SiOH⋯OC, SiOH⋯OH) and COSi type bonds.

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Section: Introductionsupporting

confidence: 65%

FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Part II

Grabowska

Sitarz

Olejnik

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The results of the tests are shown in Figure 3. Studies [10,12,13] have shown that microwave hardening increases the sand strength, which allows for the introduction of a lower amount of hydrated sodium silicate to the sand composition, improving in this way the sand knocking out properties.…”

Section: Hydrated Sodium Silicatementioning

confidence: 99%

Archives of Foundry Engineering

Hosadyna-Kondracka

Major-Gabryś²,

Kamińska

et al. 2018

Self Cite

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The essence of ablation casting technology consists in pouring castings in single-use moulds made from the mixture of sand and a watersoluble binder. After pouring the mould with liquid metal, while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in the ablation casting. The research is based on the use of Cordis binder produced by the Hüttenes-Albertus Company. It is a new-generation inorganic binder based on hydrated sodium silicate. Its hardening takes place under the effect of high temperature. As part of the research, loose moulding mixtures based on the silica sand with different content of Cordis binder and special Anorgit additive were prepared. The reference material was sand mixture without the additive. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Additionally, at the Foundry Research Institute in Krakow, preliminary semi-industrial tests were carried out on the use of Cordis sand technology in the manufacture of moulds for ablation casting. The possibility to use these sand mixtures has been confirmed in terms of both casting surface quality and sand reclamation.

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“…However, the said technology, while offering a cheap and environmentally friendly method for the manufacture of foundry moulds and cores, has also some drawbacks, which include poor sand collapsibility and reclamability, mechanical in particular [13].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Additive “B” on the Properties of Foundry Sands with Hydrated Sodium Silicate Made by Floster Technology

Izdebska-Szanda¹,

Kamińska²,

Angrecki³

et al. 2017

Archives of Foundry Engineering

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The aim of the study was to determine the applicability of a new product added to water glass-containing foundry sands hardened with ethylene glycol diacetate. The new additive designated by the symbol “B” is a composition of aqueous solutions of modified polyalcohols, improving the sand knocking out properties. The scope of studies included testing various mechanical and technological properties of foundry sand mixtures, such as permeability, friability, life cycle of cores and knocking out properties. In the technological studies, two types of water glass with different values of the silica modulus and density, designated as R145 and R150, were used. Moulding sands were prepared with the additive “B”. For comparison, reference sands with water glass but without the additive “B” were also made. In Part I of the article, the results of studies of the effect of additive “B” on the properties of foundry sands with water glass hardened by CO2blowing were discussed.

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The Influence of Glassex Additive on Properties of Microwave-Hardened and Self-Hardened Moulding Sands with Water Glass

Cited by 6 publications

References 1 publication

FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Part II

FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Part II

Archives of Foundry Engineering

The Effect of Additive “B” on the Properties of Foundry Sands with Hydrated Sodium Silicate Made by Floster Technology

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