Accession Number : AD0658023

Title :   AN EXPERIMENTAL APPARATUS FOR THE MEASUREMENT OF SESSILE DROP CONTACT ANGLES AT ELEVATED TEMPERATURES.

Descriptive Note : Technical rept. Jan-Dec 66,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Clow,W. L. ; Liu,Tung

Report Date : JUN 1967

Pagination or Media Count : 21

Abstract : An equipment suitable for the measurement of the contact angles of molten sessile drops on solid substrate was developed. Temperatures up to 2250F may be readily controlled to within plus or minus 10F for long periods of time. The environment of the specimens may be either vacuum (to 0.00001 Torr) or a specific gas. Photographic techniques were used to record the contact angles. Experimental results of molten Na2B4O7 on metal substrates showed a standard deviation of less than 2 deg. The uncertainly introduced by the angle measurement process was shown not to exceed +2 or -2 deg. (Author)

Descriptors :   (*DROPS, *TEST EQUIPMENT), (*LUBRICANTS, TEST EQUIPMENT), CERAMIC MATERIALS, SODIUM COMPOUNDS, BORATES, SURFACE PROPERTIES, LABORATORY EQUIPMENT

Subject Categories : Lubricants and Hydraulic Fluids
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE