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Improving the quality of Al-Si castings by using ceramic filters

Švecová Ivana, Tillová Eva, Kuchariková Lenka

Production Engineering Archives

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2020

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Vol. 26, Iss. 1

19--24

EN

The use of cast aluminium has still increased, so have the mechanical property requirements. By casting and also in other metallurgical processes, the inclusions enter to the molten aluminium alloy and it exhibits poor ductility or toughness. It can cause a variety of problems in the manufacture of aluminium alloy castings. Therefore, the purification of the molten aluminium alloy is one of the most important processes for improving the quality of Al-products. Filters have been used for many years in order to improve the quality of castings. The inclusions in molten secondary AlSi7Mg0.3 cast were removed using depth filtration by ceramic foam filters of 20 ppi porosity. Were used 4 types of ceramic filters in 2 thicknesses (15 and 22 mm); Brinell hardness and porosity were measured. Quality of microstructure (occurrence of oxidic particles and larger non-metallic inclusions) was observed. Experimental results show that the insertion of ceramic filters into the inlet system has contributed primarily to a decrease in porosity. On the microstructure, the inclusion of filters was not significantly reflected.

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Změna složení keramiky filtrů při filtraci oceli

Bažan J., Stranský K., Horakova D.

Prace Instytutu Metalurgii Żelaza

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2009

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T. 61, nr 5

61-63

EN

The paper is focused on clarification of context related to loss of basic oxidic component of ceramic filter at filtration of molten steel. It was established during previous experiments that on the surface of holes of ceramic filters there occurs during fi ltration decrease of material of basic component in ceramics and that slag layer was formed on the surface of capillaries in the course of fi ltration of steel, which influences these changes. It was found that this loss of basic oxide of ceramics is function of product of Gibbs energy of the relevant oxide and its concentration. The bigger is this product, the smaller is the loss of the ceramic oxide.

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Evaluating the effectiveness of heat-resistant cast steel filtration from the results of structure examinations

Asłanowicz M., Ościłowiski A., Stochańczyk J., Wieliczko P.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 1

97-102

EN

Filtration guarantees castings characterised by high quality and free from any non-metallic inclusions, which are formed at the stage of melting and pouring of liquid metal. This article discusses the problem of the effectiveness of filtration process taking as an example heat-resistant cast steel poured into ceramic moulds. In investigations, foamed zircon filters made by FerroTerm Sp. z o.o. Łódź, Poland, were used. The effectiveness of filtration was described and examined using the results of metallographic examinations, including macro- and micro-structure examinations of metal and of cast metal/ceramic filter interface, and measurements of the content of non-metallic inclusions. The methods of investigations were presented, the obtained results were described, and relevant conclusions were drawn, all of them unmistakably indicating a very beneficial effect that filtration has on molten metal quality.

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Przepływ metalu przez filtry ceramiczne

Chojecki A., Hawranek R.

Archiwum Odlewnictwa

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2005

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R. 5, nr 17

37--44

PL

Na zimnych modelach modelowano przepływ stopów przez filtry ceramiczne. Określono stopień hamowania strugi przez filtry komórkowe i piankowe. Stwierdzono, że zmniejszenie przepływu jest niezależne od ciśnienia. Umożliwia to uogólnianie wyników uzyskanych dla jednej wysokości słupa metalu. Nie powiodła się próba modelowania procesu zatrzymywania na filtrze cząstek zawieszonych w cieczy. Wymaga to odtworzenia identycznych wielkości napięć międzyfazowych w układzie modelowym. Tworzenie się placka filtracyjnego następuje jedynie przy stężeniu zawiesiny ponad 2 %, co daleko odbiega od średnich stężeń wtrąceń spotykanych w stopach odlewniczych.

EN

The flow of liquid metal through the ceramic filters has been studied using the simulation. The water was used as a modelling liquid. It was found that the reduction of the flow depends on the filter kind and the enlarging of filter chamber. The coefficient of the flow reduction for the foam and extruded filters has been evaluated.

5

Piankowe filtry ceramiczne - cel zastosowania, praktyczne doświadczenia FERRO-TERM

Ościłowski A., Pliś W.

Archiwum Odlewnictwa

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2001

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R. 1, nr 1

183--188

PL

W pracy omówiono problematykę usuwania wewnętrznych wtrąceń niemetalicznych za pomocą piankowych filtrów ceramicznych przy produkcji odpowiedzialnych odlewów z żeliwa i stopów metali lekkich. Przedstawiono doświadczenia FERO-TERM jako producenta filtrów oraz odlewni będących odbiorcami piankowych filtrów ceramicznych.

EN

In this work are elaborated questions elimination of non-metalic inclusions in castings using ceramic foam filters in production of responsible iron and copper alloy castings. You can find here the experiences of Ferro-Term as a filter producer and foundries which use the filters.