SU1761413A1 - Method of manufacturing tight inlets by diffusion welding - Google Patents

Abstract

The invention relates to pressure welding with heating, in particular to diffusion welding in vacuum, and can be used in the electronics industry, instrument engineering and mechanical engineering. The purpose of the invention is to improve the quality of the welded joint and improve the performance characteristics of pressure seals. The output pressure window of the pressure input is made of PTFE-4, which is connected to the metal housing by diffusion welding, heating is carried out to a temperature of 673-678 K, squeezed with a force of 1.5-2 MPa for 10-15 minutes and cooled at a speed of 0, 1 fps 1 ta & l., 1 ill.

Description

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with

The invention relates to pressure welding with heating, in particular to diffusion welding in vacuum, and can be used in the electronics industry, instrument engineering and mechanical engineering.

Methods are known for the manufacture of hermetic inserts for microwave technology by gluing or brazing metals with glass and ceramics.

The closest to the proposed technical essence is the method in which an energy output window is installed in the metal case of the pressure inlet, the parts are squeezed, heated and isothermally aged, followed by cooling to normal temperature.

The disadvantages of this method are the low performance characteristics of the pressure seals and the poor quality of the feed joints due to the use of plastic material (copper).

The aim of the invention is to improve the quality of the welded joint and improve the performance characteristics of pressure seals.

The goal is achieved by the fact that in a known method of producing pressure leads by diffusion welding, in which an energy output window is installed in the metal case of the pressure input, parts are squeezed, heated and isothermally aged, followed by cooling to normal temperature, the energy output window is made of fluoroplast-4, heating is carried out to a temperature of 673 ... 678 K, squeezed with a force of 1.5 ... 2 MPa for 10 ... 15 minutes, cooled at a rate of 0.1 K / s.

Comparison of the proposed technical solution with the prototype made it possible to establish compliance with its novelty criterion. In the study of other known technical solutions in this field of technology

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the features distinguishing the proposed solution from the prototype were not identified and therefore they provide the proposed technical solution with the criterion of significant differences.

The drawing shows the implementation of the proposed method.

The proposed method of diffusion welding of products is carried out as follows. Thermal insulation bases 2 are installed on the base of the chamber 1 of the diffusion-welding installation, on which the lower part of the fixture 3 is installed, in which the cage of the pressure inlet 4 is fixed with the fluoroplastic tape 5. The anti-adhesive substance b is attached to the tape 5 and 7, into which the plug 8 is placed. A radiation heater 9 is installed, close the chamber of the diffusion welding apparatus and create a vacuum of 4 10 -5 10 Pa or a protective atmosphere. The technological process of diffusion welding is carried out in the following modes: welding temperature 673-678 K, pressure 1.5-2 MPa, welding time 10-15 min. After isothermal aging, the product was cooled at a speed of 0.1 k / s to normal temperature.

PRI me R 1. We welded the nodes of the tape Teflon-4 and alloy AMgb. Metal samples were made in the form of a disk with a diameter of 18 mm, a thickness of 1.5 mm, with a hole in the middle with a diameter of 3.6 mm. The substrate was made of fluoroplast-4 tape with a thickness of 0.2 mm, which had the shape of a disc with a diameter of 4.6 mm.

Previously, the AMgb alloy welding surface was subjected to chemical cleaning, degreased with B-70 gasoline and dehydrated with rectified spirit, the Parts were placed in a special device, which was then placed in a vacuum chamber of the diffusion installation SDVU-50, with a residual pressure of 5 Pa, heated by a radiation heater to temperatures of 675 K, a pressure of 1.8 MPa was applied, kept for 12 minutes and cooled to a normal temperature at a rate of 0.1 K / s.

PRI mme R 2. Similarly to Example 1, nodes were made of fluoroplast-4 and alloy 29HK under the following process conditions; Vacuum 6 10 Pa, Tcb 674 K, pressure P 1.9 MPa, time t 13 min and cooled at a rate of 0.1 K / s to normal temperature.

The results of testing manufactured pressure seals under various welding conditions are shown in the table.

Welded specimens were tested for peel, vacuum density, and heat resistance. The test results showed that the welded pressure seals have a strength of 12-15 MPa, the vacuum density is not worse than 1 mm l / s and can withstand more than 20 cycles in the temperature range 213-573 K.

Claims (1)

Invention Formula The method of manufacturing pressure seals by diffusion welding, in which an energy output window is installed in the metal pressure seals, the parts are squeezed heated and isothermally conditioned, followed by cooling at a normal temperature, characterized in that, in order to improve the quality of the weld and improve the performance characteristics of the pressure seals, the window the energy output is made of fluoroplast-4, the heating is carried out at a temperature of 673-678 K, squeezed with a force of 1.5-2 MPa for 10-15 minutes, cooled with corrosion rate 0.1 K / s.