The Contact Angle Between Ag-Based Melts and Graphite Substrate and the Texture Evolution During the Subsequent Solidification

Weltsch, Zoltán and Fogarassy, Zsolt and Lovas, Antal and Takács, János and Cziráki, Á. and Tichy, Géza (2013) The Contact Angle Between Ag-Based Melts and Graphite Substrate and the Texture Evolution During the Subsequent Solidification. ACTA ELECTROTECHNICA ET INFORMATICA, 13 (1). pp. 41-44. ISSN 1335-8243

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Abstract

Ag based alloys are widely used in the modern brazing technologies for the substitution of tin-lead based alloys. In the present work the wetting ability between graphite substrate and diluted Ag-M (M: Cd, In, Sn, Sb) has been studied using the sessile drop method. The contact angle between the liquids and solid substrate was measured at 1200˚C. Subsequently the micro structure of the solidified drops was investigated applying X-ray diffraction (XRD) and transmission electron microscopic (TEM) measurements. A texture formation was found in the substrate/drop interface region. Comparing the values of the contact angles measured on the Ag- M samples with the degree of the texture determined by XRD it was found, that the contact angle is smaller the degree of texture higher.

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