SU995146A1 - Method of wetting metallic articles aperture surface with mercury - Google Patents

Description

(54) METHOD OF WETTING OUT THE SURFACE OF THE METAL DETAIL RADIUM

one

The invention relates to methods for manufacturing parts and assemblies of relays, preferably mercury.

The wetting of most metals and alloys with mercury under normal conditions is difficult due to the presence of oxide films on their surfaces.

Known methods of wetting with mercury surfaces of parts made from metals and alloys, mainly for mercury sealed relays, by heat treatment in a reducing environment 1 and 2.

However, these methods do not provide sufficient wetting uniformity.

There is also known a method of wetting contact working surfaces, which preliminarily applies electroplating to these surfaces of metals that are well wetted by mercury under normal conditions in air, such as silver 3. Applying such coatings, as well as controlling their performance, especially in small diameters, requires complex technology work.

The purpose of the invention is to improve the quality of wetting and simplify technology.

The goal is achieved by the method of wetting the surface of the hole under a layer of mercury simultaneously with its manufacture.

In addition, the fabrication and wetting of the 5 holes is carried out in a vacuum chamber.

The simultaneous production of holes and the wetting of their internal surfaces under a layer of mercury interferes with the direct contact of the treated surfaces with atmospheric air and their oxidation.

Eliminating the formation of oxide films can significantly improve the quality of wetting and simplify the technology.

FIG. I is schematically represented

internal wetting device

the surfaces of the holes of mercury; in fig. 2 -

the same for carrying out the process in vac20 cuum.

Claims (3)

The device comprises a workpiece 1, a device consisting of a base 2 with a notch under the part, an upper plate 3 with an opening 4 for inserting the working tool 5 and an internal cavity 6 into which mercury is fed through the tube 1. The workpiece 1 is placed in the BbieiMKy base 2, covered with a slab 3. Then a hole is drilled. At the same time, mercury simultaneously with the drill penetrates into the hole and wets it against the surface as there is no contact of the treated surfaces with atmospheric air. A device for carrying out the inventive method in a vacuum chamber contains a vacuum chamber 8 equipped with a bellows 9 allowing reciprocating movement of the working tool, a vacuum inlet 10, a vacuum pump 11 for evacuating air from the chamber and a tube 7 for supplying and removing mercury. Wetting is carried out as follows. The fixture shown in FIG. 1 is placed in the vacuum chamber 8, then the item 1 is processed into the recess of the base 2, closed with plate 3, mercury is fed through the tube 7 into the internal cavity 6 of the upper plate 3, air is pumped out by the vacuum pump 11 from the vacuum chamber 8. Taking into account that the specific gravity of mercury is 13.6 g / cm, i.e. it is 13.6 times as heavy as water, then at normal temperature its vapor in the vacuum chamber is practically absent, and a small amount of mercury is pumped out by a vacuum pump together with air, which allows to obtain the necessary vacuum in the chamber. After pumping air into the parts, a hole is drilled. The proposed method conducts the wetting of the contacts of the contact plates of mercury relays at the stage of manufacturing prototypes. The introduction of the method of wetting the inner surfaces of the holes under the mercury layer with mercury allows increasing labor productivity twice, improving the quality and retention of wetting and simplifying the process of combining several operations in one direction, as well as saving precious metals. Claims. A method of wetting the surface of a hole of a metal part with mercury, characterized in that, in order to increase the quality of wetting and simplify the technology, the wetting is carried out under a layer of mercury simultaneously with the manufacture of the hole. 2. A method according to claim 1. characterized in that the manufacture and wetting of the hole is carried out in vacuum. Sources of information taken into account during the examination 1. USSR author's certificate No. 203079, cl. H 01 H 1/08, 1966. 2. USSR Author's Certificate ° 230989 cells. H 01 H 49/00, 1967 3. The technological process of electroplating parts YL 601.00. W / WA