Surface Energy Of Liquid Copper And Single-crystal Sapphire And The Wetting Behavior Of Copper On Sapphire


The wetting behavior of liquid copper on sapphire is affected by the crystallographic orientation of the sapphire surface, the oxygen partial pressure, and the temperature. The influences of each of these conditions have been studied by the sessile drop technique over the oxygen partial pressure range 10_2-10-20 atm at temperatures of 1100 and 1250°C. The effect of oxygen partial pressure on the liquid copper surface energy follows the Gibbs-Langmuir law. The contact angle varies with the crystallographic orientation of the sapphire surface. This variation is more significant at higher oxygen partial pressures, but is eliminated at higher temperatures. The liquid copper surface energy was determined to be γ∣v = 1.757−3.3x10-4T(°C) J/m2. The solid surface energy of sapphire was estimated as γsV = 1.961−4.7x10-4T(°C)J/m2, which applies only to the temperature range 927−2077°C. © 1988 VSP.


Materials Science and Engineering

Keywords and Phrases

liquid copper; sapphire; surface energy; Wetting

International Standard Serial Number (ISSN)

1568-5616; 0169-4243

Document Type

Article - Journal

Document Version


File Type





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Publication Date

01 Jan 1988