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2 Archives of Foundry Engineering

2 2010

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Physical and chemical clay binder characteristics from various locality and their influence on some technological properties of bentonite mouling mixtures

100%

Vasková I. , Fecko D. , Malik J. , Futáš P.

tom Vol. 10, iss. 1 spec.

211--216

The aim of this paper is to explore the complex physical – chemical characteristics of bentonite of slovak provenance and to compare with non-slovak, which is considered as European highest quality standard in foundry and to compare from the point of foundry application. These characteristics of raw material have direct relationship with technological properties of bentonite sand mixtures and mainly with the quality of castings poured into these mixtures. To compare technological properties of bentonite forming mixtures with use of various clay types point of view application in foundry industry.

Thermal aspects of temperature transformations in silica sand

100%

Kowalski J. S.

2010

tom Vol. 10, iss. 3

111--114

Problems related with the choice of moulding sand composition considering its behaviour in contact with molten metal were discussed. The investigations of high-temperature phenomena enable moulding sand composition to be evaluated in terms of its applicability under the specific conditions of a foundry shop. It is also possible to eliminate the casting defects related to moulding sand and its properties. The investigations were carried out on selected moulding sands from the family of the traditional carbon-free moulding mixtures. The effect of moulding sand composition and moisture content on the linear dilatation and stress formation caused by an allotropic quartz transformation was determined. The investigated phenomena were analysed on 3D diagrams plotted from the test data. A strong effect of the beta quartz - alpha quartz transformation at a temperature of about 600oC was stated.