SU1469318A1 - Device for determining surface tension of molten alkali metals and their alloys - Google Patents

Abstract

The invention relates to instrumentation engineering, in particular to devices for studying the surface properties of liquid metals, and may find application in physical chemistry and theoretical metallurgy. The aim of the invention is to expand the field of application of the device by providing a study of liquid metals wetting the substrate material. The invention makes it possible to determine the surface tension of liquid alkali metals and their alloys wetting the substrate material in the atmosphere of its own saturated vapor. This is achieved by installing a capillary inside the whole-tube device. The slice of this capillary is made in the form of a round table with a horizontal surface and a table edge sharpened on the knife. The angle of convergence between the upper (horizontal) and lower surfaces at the edge of the table does not exceed 10 °. 1 il. (L

Description

The invention relates to instrumentation engineering, in particular to devices for studying the surface properties of liquid metals, and may find application in physical chemistry and theoretical metallurgy.

The aim of the invention is to expand the field of application of the device by providing a study of liquid metals wetting the substrate material.

The drawing shows a diagram of the proposed device.

The device for determining the top 1 tension of liquid alkali metals and their alloys is an all-in-one instrument (measuring cell) made of glass and consists of two tanks 1 and 2 for the components A and A2 of the melts under study, a V-shape - a metering tube 3, a measuring compartment with windows 4 for photographing a drop, as well as a capillary 5 located inside the test compartment and a system of communication tubes 6 connecting the capillary 5 to the tanks 1 and 2. The upper part of the capillary ends mean Coy 7 formed in a circular table with a horizontal surface, the edge

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which is sharpened on a knife. Such sharpening of the edge prevents the drop from falling off the substrate, even if the liquid metal wets the substrate material and ensures that a stable drop is created on the surface of the substrate. The upper limit of the sharpening angle depends on the surface tension of the metal and is chosen experimentally. In most cases, sharpening angles are sufficient, not exceeding 10,

The device works as follows

The initial components A and Ag after thermal vacuum treatment are placed in tanks 1 and 2, the device is sealed from the evacuated vacuum station and installed inside an air thermostat that can rotate in two mutually perpendicular directions.

To measure the surface tension of component A, the device is rotated through an angle of 90 along the clock hand (in the plane of the drawing) and then returned to its original position. At the same time, the melt (component AJ) is fed through the communication tube 6 into the capillary 5. A droplet is formed on the surface of the substrate 7, the profile of which is photographed at different temperatures through the windows A. After the measurement is completed, the device rotates (in the plane of the drawing) counterclockwise by 90 and liquid metal A (flows through the communication tube back into tank 1,

To form an alloy, the device is rotated through a certain angle in the direction perpendicular to the plane of the drawing, in this case, part of the liquid metal Aj. from tank 2 pos

blunt a V-tube into a pre-calibrated (by volume) measuring the metal levels in a V-tube with a cathetometer, turning the device to a certain angle first to itself and then from itself (in a plane perpendicular to the plane of the drawing) transfer the known the volume (and therefore the known mass, since the density of the A2 additive metal is assumed to be known) of the liquid metal A to tank 1, Ldes, and an alloy of known concentration is formed, since the initial mass of component A and the amount of added Ag component are known,

After homogenizing the resulting alloy, its surface tension is measured in the same way as described for the pure component Aj. For each of the melts, the surface tension can be measured the desired number of times. If in tanks 1 and 2 to place not pure metals, but splat. you then get the ability to measure the surface tension of three or more component alloys.

Claims (1)

Invention Formula A device for determining the surface tension of liquid alkali metals and their alloys, containing reservoirs for liquid metals, connected by communication tubes with a capillary, the upper part of which is made in the form of a substrate for a metal drop, characterized in that the study of liquid metals wetting the substrate material; the drip stand is made in the form of a round table with a horizontal surface, the edge of which is sharpened on the knife. Editor T. Parfenova Compiled by A, Koshcheev Tehred M. Khodanych Order 1347/45 Circulation 788 VINILI of the State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Proofreader V.Girn to Subscription