Ag-Cu Sıvı Alaşımlarının Yüzey Gerilimi ve Viskozitesinin Tahmini

Abstract

Bu çalışmanın amacı, ikili sıvı alaşımların viskozitesinin literatürde bulunan tüm viskozite modelleri kullanılarak, 1373K sıcaklıkta ikili sıvı Cu-Ag için yapılan deneylerden elde edilen sonuçları karşılaştırmaktır. Aynı işlem, aynı alaşımın yüzey gerilimi için de 1423 K sıcaklıkta gerçekleştirilmiştir. Literatür araştırmasında, Miedema modelinin, bu alaşımın termofiziksel özelliklerinin belirlenmesinde çok az kullanıldığı gözlendi. Bunun üzerine, bu çalışmada, Miedema modeli kullanılarak, karışımın entalpisi ve aşırı (fazlalık) Gibbs serbest enerjisi hesaplanmıştır. Bu çalışmada yüzey gerilimi ve viskozite değerleri arasında bir ilişki bulunmuştur. Yüzey gerilimi ve viskozite değerleri, sabit bir gümüş oranında, sıcaklıkla ters orantılı ve sabit bir sıcaklıkta bakır içeriği ile doğru orantılı olarak elde edildi ve sonuçlar literatürdeki mevcut veriler ile karşılaştırıldı.

Keywords

• Viskozite
• Yüzey gerilimi
• Geometrik modeller
• Fiziksel modeller
• Butler denklemi
• Miedema modeli

Estimating of Surface Tension and Viscosity of Liquid Ag-Cu Alloys

Abstract

The present paper compares the results obtained from the experiments for the binary liquid Cu-Ag system at a temperature of 1373K. All viscosity models available in the existing literature on the viscosity dependence of the viscosity of binary liquid alloys were used. The same process was carried out for surface tension at a temperature of 1423 K for a dual liquid Cu-Ag system. In the literature survey, the Miedema model showed little use in determining the thermophysical properties of this alloy. Using Miedema model, the mixture enthalpy and excess Gibbs free energy in the aforementioned models were calculated. In the present study, a correspondence was found between surface tension and viscosity values. Surface tension and viscosity values were inversely proportional to the temperature, at a fixed silver fraction xAg, and directly proportional to copper content at a constant temperature. The obtained results were compared to the data in the existing literature.

Keywords

• Viscosity, Surface tension, Geometric models, Physical models, Butler equation, Miedema’s model.
• Viscosity
• Surface tension
• Geometric models
• Physical models
• Butler equation

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