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

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

Archives of Foundry Engineering

2010

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.

Tests of moulding mixture by using various clay binder granularity

Vasková I., Malik J., Futáš P.

Archives of Foundry Engineering

2009

Vol. 9, iss. 1

29-32

Bentonite as foundry binder has dominant and important significance in Slovak and Czech foundries. Present - day wide world produce of casts is estimated to 80 mil ton. There are about 60-70% casts into bentonite moulding mixtures. We say about mixture of first binder generation where join is results of capillary pressure force and Van der Waals force (forming mixture on the base of bentonite binder). European initions of this technology be included in thirties last century. This technology will have dominant position in spite of formation and development of new manufacturing processes in future. There are these advantages of using moulding mixture on the bentonite base: high value of compression strength and plasticity of this binder is achieved at low content of surface moisture - this fact makes it possible to pour by technology of raw clay, relatively low costs by up to raw material, Cca 95 - 98% repeated usage of moulding mixture, high productivity of used production engineering, high quality of casts (quality surface, uniform accurance, casts without defects) is assured by modern way of ramming, hygienic and ecological advantage.

Wpływ reologicznych właściwości suspensji iłowych na strukturę kwarcowo - iłowych mas formierskich

Dobiejewska E.

Krzepnięcie Metali i Stopów

1998

nr 35

105--111

W artykule przedstawiono wpływ węglowych i węglotwórczych dodatków oraz siarczanów litowców i temperatury na zmianę lepkości suspensji lepiszcze iłowe - woda. Istnieje wyraźna zależność pomiędzy wartością lepkości suspensji a strukturą masy formierskiej, szczególnie topografią i morfologią powłok lepiszcza oraz mostków wiążących osnowę kwarcowo - iłowych mas formierskich.

In this paper we present the influence of carbon and alkali metal sulphates additions, as well as temperature upon the viscosity of suspension: clay bond-water. Increase of viscosity affects the topography of clay bond coatings and bonding bridges, and hence if affects quartz-clay moulding sands.