On the measurement of surface tension in binders used for moulding sands

• Autorzy: Hutera B. , Smyksy K. , Drożyński D.
• Języki publikacji: EN

Abstrakty

EN

The surface tension of foundry binders is a very important parameter affecting the properties of a sand-binder system. Combined with other parameters, its value determines an outcome of the process of moulding sand preparation and the mechanical properties of the ready moulding composition. The problem of how to measure the surface tension of binders used in preparation of moulding sands is discussed only occasionally. Indirectly, the surface tension is characterised by the value of a contact angle, but it never means that these two parameters can be considered identical. Numerous methods are available and used at present to measure the surface tension, among others, the capillary rise method, the spinning drop method, the sessile drop method, the pendant drop method, the method of pulled out ring (or plate, or frame). There is also a rich variety of devices offered with different measuring methods. The devices are modern and represent a high level of the technical skill and art. Unfortunately, also their price is high. It is, however, possible to obtain the reliable results of the surface tension measurement using relatively simple methods, viz. the stalagmometric method and the capillary rise method. What is necessary are proper conditions of the measurement, directly related with the specific properties of binders. The present paper gives examples of the results obtained during measurement of the surface tension of some selected binders. Attention was drawn to the methods of taking measurements, and the obtained results were discussed and analysed. The possibilities of detemining the surface tension of the examined binders from the results of the contact angle measurements using the "sessile drop" and "pendant drop" methods were outlined.

Słowa kluczowe

EN

foundry technology; moulding sands; binders properties; surface tension of binders

PL

technologie odlewnicze; masa formierska; właściwości spoiwa; napięcie powierzchniowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 2
• Strony: 55--60
• Opis fizyczny: Bibliogr. 14 poz., rys., wykr.

Twórcy

autor

Hutera B.

autor

Smyksy K.

autor

Drożyński D.

• University of Science and Technology - AGH, ul. Reymonta 23, 30-059 Kraków,

Bibliografia

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