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1
Content available The Influence of Inorganic Binder Type on Properties of Self-Hardening Moulding Sands Intended for the Ablation Casting Process
Puzio Sabina, Kamińska Jadwiga, Angrecki Michał, Major-Gabryś Katarzyna
Journal of Applied Materials Engineering
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2020
|
Vol. 60, iss. 4
99--108
EN
The aim of the present work is to compare the properties of self-hardening moulding sands based on inorganic binders based on sodium silicate of different modules, geopolymer binders and phosphate binders and to prove they can be used in the ablation casting process. Ablation casting is a process in which, directly after pouring the liquid alloy, the mould is sprayed with water until it is completely eroded and a finished, cooled casting is obtained. The use of proecological water-dilutable binder makes it possible to recover the sand matrix after drying the suspension that remains after the process. Moulding sands were prepared on the basis of four inorganic binders available on the market. For each of the moulding sands the bending strength was tested after 1, 2, 4 and 24 h of hardening. Then, the masses with optimum bending strength were selected and subjected to gas emissivity tests. A thermal analysis of moulding sands selected for testing was also carried out in order to determine the loss of mass during annealing. The susceptibility of moulds to erosion under the influence of ablative medium was also assessed by measuring the time of mould erosion. Tests showed the possibility of using self-hardening moulding sands based on inorganic binders for the ablation casting process of aluminium-silicon alloys.
2
Content available Effects of South African Silica Sand Properties on the Strength Development and Collapsibility of Single Component Sodium Silicate Binders
Banganayi F. C., Nyembwe K., Polzin H.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 3
5--12
EN
This study shows the results of the investigation of the strength performance, and residual strength of a single component inorganic binder system Cast Clean S27®. The study was conducted using three different foundry sand sources in South Africa. Sample A is an alluvial coastal sample, sample B is an alluvial riverbed sample and Sample C is a blasted sample from a consolidated quartzite rock. The binder was also cured using three different curing mechanisms. The aim of the investigation was to determine the variation of strength performance and residual strength between the different South African sand sources based upon the physical and chemical properties of the sand sources. The moulding sand was prepared using three possible curing mechanisms which are carbon dioxide curing, ester curing and heat curing. The strength measurements were determined by bending strength. Sample A and sample C sand had good strength development. Sample B sand had inferior strength development and excellent high temperature residual strength. The study showed that the single component inorganic binders have good strength development and low residual strength. The silica sand properties have major contributing factors on both strength development and residual strength. The degree of influence of silica sand properties on strength performance and residual strength is dependent on the time of curing and method of curing.
3
Content available The Effect of Nanostructure Modification on the Silicate Binder on Its Binding Characteristics and Functional Properties
Izdebska-Szanda I., Baliński A., Angrecki M., Palma A.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 3
1033--1036
EN
A method for the chemical modification of silicate binder (hydrated sodium silicate) affecting the distribution of its nanostructure elements was disclosed. The effect of silicate binder modification on the resulting technological properties of moulding sands, determined under standard conditions and at elevated temperatures in the range from 100°C to 900°C, was discussed. Modification of this type is done on inorganic binders in order to reduce their unfavourable functional properties. It is particularly important when moulding sands with the silicate binder are used for casting of low-melting alloys. Therefore special attention was paid to the impact that modification of inorganic binders may have on the knocking out properties of sands prepared with these binders, when they are used in the process of casting non-ferrous alloys.
PL
Przedstawiono sposób modyfikacji chemicznej spoiwa krzemianowego (uwodnionego krzemianu sodu) wpływającej na rozkład elementów jego nanostruktury. Omówiono wpływ modyfikacji spoiwa krzemianowego na uzyskane właściwości technologiczne masy formierskiej wykonanej z jego udziałem, określone zarówno w warunkach znormalizowanych, jak i w warunkach podwyższonej temperatury w zakresie od 100°C do 900°C. Zastosowanie tego rodzaju modyfikacji spoiw nieorganicznych ma na celu ograniczenie ich niekorzystnych cech użytkowych. Jest to szczególnie istotne w przypadku zastosowania masy formierskiej ze spoiwem krzemianowym do wytwarzania odlewów ze stopów metali charakteryzujących się małą wartością temperatury topnienia. Dlatego szczególną uwagę zwrócono na wpływ modyfikacji spoiw nieorganicznych na wybijalność mas z ich udziałem przy odlewaniu stopów metali nieżelaznych.
4
Content available Moulding sands with new inorganic binders - ecology assessment in the aspect of work environment
Szanda I., Żmudzińska M., Faber J., Perszewska K.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 3
117-122
EN
The development of economy and industry introducing new technologies and materials often means the increased threat of occurrence of factors harmful to humans and environment. Workers employed in foundries as mould pourers are the group of high professional risk. Foundry moulding sands when poured with liquid metal are a source of the emission of harmful, toxic and carcinogenic (benzene, PAHs) compounds. The paper presents the results of studies on the concentration of chemical compounds emitted in the process of casting aluminium alloy and brass using moulding sands with the new inorganic binders. The specific values of the exposure indices were compared with the limit values. This enabled an assessment of the impact of moulding sands on work environment. The obtained results were compared with the values of contaminants emitted when pouring foundry moulds made from furan sands and bentonite sands with an addition of coal dust.
5
Content available Investigating of the Knocking Out Properties of Moulding Sands with New Inorganic Binders Used for Castings of Non-ferrous Metal Alloys in Comparison with the Previously Used
Izdebska-Szanda I., Angrecki M., Matuszewski S.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2s
117--120
EN
The article presents the results of investigations, which make a fragment of the broad-scale studies carried out as a part of the project POIG.01.01.02-00-015/09 “Advanced materials and technologies”. One of the objectives of the introduction of new inorganic binders is to provide a good knocking out properties of moulding sands, while maintaining an appropriate level of strength properties. Therefore, a logical continuation of the previous studies were carried out the tests knocking out properties of moulding sands with new inorganic binders, including making moulds, pouring them by the chosen of non-ferrous metal alloys, knoking-out, and determining the knocking out work. The results of the study were related to the research results obtained by applying the moulding sand performed by existing technology.
6
Content available Evaluation of reclamability of molding sands with new inorganic binders
Izdebska-Szanda I., Baliński A., Angrecki M.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
35-40
EN
One of the purposes of the application of chemically modified inorganic binders is to improve knocking out properties and the related reclamability with previously used in foundry inorganic binder (water glass), which allowing the use of ecological binders for casting nonferrous metals. Good knocking out properties of the sands is directly related to the waste sands reclamability, which is a necessary condition of effective waste management. Reclamation of moulding and core sands is a fundamental and effective way to manage waste on site at the foundry, in accordance with the Environmental Guidelines. Therefore, studies of reclamation of waste moulding and core sands with new types of inorganic binders (developed within the framework of the project) were carried out. These studies allowed to determine the degree of recovery of useful, material, what the reclaimed sand is, and the degree of its use in the production process. The article presents these results of investigation. They are a part of broader research programme executed under the project POIG.01.01.02-00-015/09 'Advanced materials and technologies'.
7
Content available remote Technological and ecological studies of moulding sands with new inorganic binders for casting of non-ferrous metal alloys
Izdebska-Szanda I., Szanda M., Matuszewski S.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1
43-48
EN
The article presents the results of studies which form a part of broader research programme executed under the project POIG.01.01.02-00-015/09 "Advanced materials and technologies". In a concise manner, the results of studies on the effect of chemical modification of inorganic binders on the technological properties of moulding sands containing these binders were presented. Special attention was paid to the effect of modification of inorganic binders on their thermal destruction behaviour in the range of pouring temperatures of the non-ferrous metals and their alloys. Also the results of comparative studies of the thermal emission of toxic gases and odours from moulding sands with new inorganic and organic binders were discussed.
8
Content available remote Effect of additives promoting the formation of lustrous carbon on the knocking out properties of foundry sands with new inorganic binders
Izdebska-Szanda I., Stefański Z., Pezarski F., Szolc M.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 1
17-20
EN
The article presents the results of investigations, which make a fragment of the broad-scale studies carried out as a part of the statutory activity on optimising the foundry sand technology using new, modified, inorganic binders. The results of investigations regarding the effect of lustrous carbon carriers on the technological properties of foundry sands with inorganic binders were presented in a concise manner. The selected additives were introduced to moulding sands prepared with the new, modified, inorganic binders bonded by the chemical reaction or by blowing with gaseous CO2. Attention was focussed on the effect of selected additives promoting the formation of lustrous carbon on the knocking out properties of moulds and cores prepared from sands with the new types of inorganic binders. The quality of the test castings was also evaluated along with the tendency to the formation of lustrous carbon at the metal - mould interface, basing on the results of microscopic examinations and analysis of the chemical composition using an X-ray microanalyser.
9
Content available Badania nad poprawą właściwości i zastosowaniem nowych spoiw nieorganicznych do wykonywania ekologicznych mas formierskich i rdzeniowych
Pezarski F., Izdebska-Szanda I., Smoluchowska E.
Prace Instytutu Odlewnictwa
|
2008
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T. 48, z. 2
48-56
PL
W artykule przedstawiono wyniki części prac badawczych, prowadzonych w ramach działalności statutowej dotyczącej technologii mas z nowymi, modyfikowanymi spoiwami nieorganicznymi, wiązanymi chemicznie i CO2. Zaprezentowane wyniki badań mas samoutwardzalnych z nowymi spoiwami nieorganicznymi przedstawiają charakter zmian podstawowych parametrów technologicznych w funkcji czasu, przy zmiennym udziale składników wiążących oraz - istotny z punktu widzenia odlewni - wpływ warunków otoczenia (temperatury i wilgotności względnej) na kinetykę wiązania tych mas. W przypadku mas utwardzanych CO2 , szczególną uwagę zwrócono na osypliwość wykonywanych mas, stanowiącą wskaźnik jakości powierzchni form i rdzeni, co ma istotny wpływ na jakość produktu w warunkach przemysłowych.
EN
The article gives the results obtained in a fragment of the studies, carried out under a statutory activity, on optimising of the foundry sand technology with new modified inorganic binders, chemically bonded and CO2 hardened. The presented results of the investigations of the self-setting sands with new inorganic binders show the character of changes in basic technological parameters in function of the time and a variable content of the binding agents, allowing also for the important - from the foundry's point of view - effect of ambient conditions, i.e. temperature and humidity, on the kinetics of the sand binding. In the case of CO2 hardened sands, special attention was paid to the phenomenon of friability of these sands, which is considered an indication of the mould and core surface quality, and as such has an important effect on the quality of final products when fabricated under the industrial conditions.
10
Content available remote Investigating the kinetics of the binding process in moulding sands using new, environment-friendly, inorganic binders
Izdebska-Szanda I., Pezarski F., Smoluchowska E.
Archives of Foundry Engineering
|
2008
|
Vol. 8, iss. 2
61-66
EN
The article discusses the results of an investigation carried out on the chemically bonded and CO2 blown moulding sands using selected, modified inorganic binders. The investigations make an important part of the work conducted within the framework of a statutory activity to optimise the sand technology using new, modified, inorganic binders. The presented results of the investigation of the self-setting sands with new inorganic binders show changes in basic technological parameters in function of time and with varied content of the binding agents. The, very important for a foundry, effect of ambient conditions (temperature and humidity) on the kinetics of the binding process of the self-setting sands with these binders was discussed. In the case of sands hardened with CO2, attention was drawn to the problem of mould and core surface quality, expressed in terms of the friability, very important for the quality of castings made under industrial conditions.
11
Content available remote Potencjal &zeta uwodnionego krzemianu sodu
Baliński A., Janusz W.
Archiwum Odlewnictwa
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2004
|
R. 4, nr 11/1
29--34
PL
Przeprowadzone badania wartości potencjału &zeta uwodnionego krzemianu sodu wskazują na występowanie w nim maksymalnie czterech rodzajów cząstek o odmiennych potencjałach. Cząstki te mogą pojawić się podczas zmian elektrokinetycznych zachodzących w powstającym żelu. Rozkład potencjału &zeta może mieć wpływ na właściwości wytrzymałościowe (kohezyjne) powstającego żelu krzemionkowego, a tym samym na właściwości wytrzymałościowe mas formierskich, w których zastosowano jako spoiwo uwodniony krzemian sodu.
EN
Excuted research of the &zeta potential of the soluble sodium silicate evidence the occurrence to a maximum four kinds of elements of the structure with different potentials. Thest small particles can appear during electrokinetic changes in the nascent gel. Distribution of the &zeta potential perhaps to have the influence on the strenght proprieties (kohesion) of the nascent silica gel, and consequently on the proprieties of the moulding sands in which soluble sodium silicate was used as the binder.
12
Content available remote Wytrzymałość resztkowa mas formierskich z uwodnionym krzemianem sodu utwardzanym dioctanem glikolu etylenowego w świtle przemian fazowych i temeraturowych powstałego żelu krzemionkowego
Baliński A.
Archiwum Technologii Maszyn i Automatyzacji
|
2002
|
Vol. 22, Nr 1
11-22
PL
W artykule przedstawiono wyniki badań zmian wysokości (objętości) próbek żelu powstałego na skutek reakcji chemicznej pomiędzy różnymi rodzajami uwodnionego krzemianu sodu i diocta-nu glikolu etylenowego, poddanych działaniu podwyższonej temperatury. W charakterystycznej temperaturze przemian związanych ze zmianami objętościowymi żelu określono wytrzymałość resztkową próbek mas formierskich. Omówiono prawdopodobną zależność pomiędzy przemianami fazowymi i temperaturowymi żelu krzemionkowego a wytrzymałością resztkową mas formierskich wykonanych z udziałem badanego układu wiążącego.
EN
Results of investigations of the height (volumes) changes of the silica gel samples formed in consequence of chemical reaction among different kinds of soluble sodium silicate and diacetate ethylene glycol in increased temperatures, has been presented. In characteristic temperatures of these transformations the remainder strenght of samples of moulding sands has been qualifed. There has been described the probable dependence among transformations phase of siliceous gel and the remainder strenght of the moulding sands with investigated binding system.
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