SU1599715A1 - Method of determining capillary filling of vertical gap with melt - Google Patents

Abstract

The invention relates to an instrumentation technique, in particular to methods for analyzing capillary phenomena in a vertical gap, and can be used in determining the properties of solders for brazing metals. The aim of the invention is to improve the accuracy of determination and reduce the consumption of the melt. For this, the charge of the melted substance is placed in the cavity of the inner tube, eccentrically placed in the outer tube with a bottom at the bottom end. After melting of the sample and subsequent cooling to solidify the melt, the distance between the level of the lower point of the melt in the gap between the tubes and the level of the lower point of the meniscus of the melt in the inner tube is measured. When determining the elevation of the melt in the gap, the reading is made from the level calculated on the basis of the measured value. 1 il.

Description

The invention relates to instrumentation engineering, in particular to methods for analyzing -capillary effects in a vertical gap, and can be used in various industries in determining the properties of solders for brazing metals.

The aim of the invention is to improve the accuracy of determination and reduce the consumption of the melt.

The drawing shows the design of the device for implementing the proposed method.

The device consists of an inner tube 1 having an inner diameter d and an outer diameter d, outer

a tube 2 having an internal diameter dg AND containing bottom 3 at the bottom end; Tube I is placed in the cavity of tube 2 in such a way that they touch on the image, creating a gap b varying from 0 to the maximum value (, d -d ,. A sample of the test substance is placed in the cavity of the inner tube 1 and heated according to a predetermined temperature in a given atmosphere. During the melting process, the sample melts. The resulting melt wets the surfaces of tubes I and 2. Under the action of capillary pressure, the melt rises dawn 9 to form at the interface with the gas atsd

ate

22

14 84

tube 1

13

7 80

Yosphere surface 4, in the cavity of the inner tube, the melt forms a Yenisk 5.

 Example. The capillary capacity of the gap between the copper vertical surfaces, varying from 0 to 1 mm with the melt of solder PSr4, was determined. The gap was created by the surfaces of two tubes, one of which was placed in the cavity of the other, touching it around the outer dimensions of the outer 2 and inner 1 of the tubes:

2

Outer diameter i

; MM

; Interior

diameter,

mm

Height mm

After assembling the tubes and fixing them in the desired position, a hinge of solder weighing 24 g was placed in the inner cavity of the inner tube 1. Then, flux PV209X was introduced into this cavity and into the gap cavity. Nagev was carried out in a lamer furnace up to 750-800 ° C, the temperature was measured with a thermocouple mounted on one of the tubes. At this temperature, it was allowed to stand for 20 minutes, then cooled to room temperature. After washing the surfaces of the tubes from the flux, they cut and measured the distance L between the level occupied by the low point of the melt surface in the gap and the level occupied by the lower point of the melt meniscus in the inner tube 1 ° In this case D 5.8 mm. The height of the rise of the melt in the gap for each value of the width of the gap is measured from the level that climbed below the level occupied by the bottom point of the surface of the melt in the gap by an amount equal to 1

I / - 2 (,) / d.

Claims (1)

In this case, 1.mm. Invention Formula A method for determining capillary filling of a vertical gap with a melt, which consists in bringing two vertical eccentric tubes arranged forming a variable width gap into contact with the melt, cooling the melt before crystallization and measuring the height of the level of the crystallized melt in the variable width gap, characterized in that increasing the accuracy of determining and reducing the melt flow rate, bringing two vertical eccentrically arranged tubes, the outer of which is made from the bottom m at the bottom end, in contact with the melt, is carried out by placing a sample of the melted substance in the cavity of the inner tube, followed by heating the tubes to melt the hinge, and the height of the crystallized melt in the variable width gap after cooling the melt is measured from a level below the bottom point of the surface melt in the gap of variable width by the value of 1 equal to 1 (d, -d,) / d, where D is the distance from the level occupied by the lower point of the melt surface in the gap to the level occupied by the lower point of the melt meniscus in the inner tube, m; d is the inner diameter of the outer tubes, m d: - outer diameter inner tubes, m; d is the inner diameter of the inner tube, m;