SU1221547A1 - Arrangement for determining density and surface tension of liquid solutions - Google Patents

Abstract

A device for determining the density and surface tension of liquid solutions is intended for analyzing metallic and semiconductor melts by the method of a lying drop. The purpose of the invention is to expand the range of concentrations of the studied solutions and to improve accuracy by eliminating errors associated with splashing a drop when it is formed. Device G contains an underlay, made in the form of a horizontal plate with two vertical through cylindrical holes, and a dispenser that is movable relative to the substrate and has a calibrated high / low capacity in the upper part. The dispenser is installed under the substrate and is in contact with it. 1 il.

Description

The invention relates to a measuring and control technique, in particular to the physicochemical analysis of liquids, mainly metal and semiconductor melts, by the method of a lying drop.

The aim of the invention is to expand the range of concentrations of the test solutions, as well as to increase the accuracy by eliminating errors associated with splashing a drop during its formation.

The drawing shows a diagram of the vacuum chamber of the device.

The device consists of a horizontal substrate 1 in the form of a plate with through vertical holes 2 and 3. Under the substrate 1 there is a movable dispenser 4 with a calibrated notch 5. The substrate and the dispenser are located inside a cruciform glass cell 6, which is formed by two tubes. The ends of one of the corpses are optical flat windows parallel to the plane of the drawing and are intended for photographing droplets of the melts under investigation using an optical system. The other tube 7 is used to move the dispenser 4 by means of an electromagnet 8 and an iron rod in a glass case 9, which is rigidly connected to the dispenser 4. Dispenser 4 is pressed down to the substrate 1 by means of two flexible molybdenum plates 10. Inside the cell above the hole Bins 11 and 12 for the initial melt components are located in the substrate 1. The cell is also equipped with a heater (not shown), I

The device works as follows.

Pure, solid components are loaded into bins 11 and 12.

In this case, the masses of the initial components are selected so that they are just enough to form a large drop of each of the components above holes 2 and 3. After evacuation, the cell is heated and the metals, having melted, flow down through the lower narrowing of the bunkers, filling hole 2 and 3 in the recess 5 under the hole 2 and form large drops.

Considering the masses of the initial components and the volumes of Vj, Vji and VO (respectively, 1 and 2 holes and notches 5)

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photographs of droplets with a 4-5 magnification are taken from the known and photographed drops; according to their parameters, the volumes of 1 parts of V drops, protruding above the horizontal plane of the substrate. and, the method proposed in (3). The density values of the components are found by the formulas

Wg

t,

Shg

t.

: ,, P2 ° V, Vi, 4V, .4V

 7v: about

The concentration of the first component in the first and second melts will be x, 1, X O, respectively.

The surface tension is then determined by a known method (3).

To prepare a new concentration of melt, the dispenser 4 is displaced relative to the substrate 1 so that the recess 5 is under the orifice 3. In this case, the melt of the second component with a volume V due to direct contact with the melt of the first component is mixed with each other. Having homogenized the solution by exposure for 0.5-1 h, photographing the slurry and repeating the procedure for determining the droplet volume, density and surface tension of the solution. Removing the melt obtained, the mass, density and concentration of the first component in it are determined by formulas k.

.) prVj4V, + v,. . (.

m, m, -piV3

(one

To prepare a solution of the new composition of the plate return to the outcome. position. About 5-1 hour exposure made it possible to homogenize the solution, after which a newly obtained drop was photographed. Measuring the parameters of the contour of the drop, finding its volume is carried out in a similar way.

From this it follows that to obtain large droplets of different concentration compositions, the calibrated dosing volume (in recess 5) is alternately placed under the opening 2, then under the opening 3, held in each new position of 0.5-1 h to obtain a uniform melt composition .

For all subsequent formulations prepared drops, starting with the fourth, the mass, density and concentration are found by the formulas

M

1221547

H n-2 P -2 o PnMVo;

GOP

if and - odd

Vn.V

g, I Vu.V,

five

if n is odd

m

.2 Pn-i o Pfi-i o (l- if n is odd

..n- -pn-zVo Pn-iVoH-xj -)

m.

where n - indicates the order of the prepared melt.

Claims (1)

Invention Formula A device for determining the density and surface tension of liquid solutions containing a substrate for a drop of the test solution, a dispenser that is movable relative to the substrate with a calibrated notch, and an optical system for obtaining the image of a drop. if n is odd if h is even characterized in that, in order to broaden the range of concentrations of the solution and improve the determination accuracy, the substrate is made in the form of a horizontal plate with two vertical through cylindrical holes, and the dispenser) in the form of a plate with a calibrated notch in the upper part and with the possibility of horizontal relative to the substrate, with the dispenser mounted under the substrate and in contact with it. eleven Editor A.Gulko Tehred L.Oleinik ° P l1G 1-1 Order 1606/49 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch ShSh Patent, Uzhgorod, st. Project, 4