SU1759497A1 - Method of making platinite wire - Google Patents

Abstract

Use: in the manufacture of platinum wire, intended for the manufacture of electrovacuum and semiconductor devices. SUBSTANCE: MB brand tape and 43N ferronickel wire are degreased with trichlorethylene using ultrasound, defatted tape and wire are fed to the stripping machines, where the tape is cleaned in a nitrogen atmosphere, and the wire is in air. The stripped tape and wire enter the vacuum chamber with a residual pressure of 13.3 Pa, where the tape is formed around the wire into a tube. The welding of the edges of the tape is carried out with an electron beam. Then the tube was pressed in vacuum around the wire in a die with a degree of tube deformation of 7.0%. The resulting preform was supplied to an induction heating unit, where it was heated to a temperature of 850 ° C, at a residual pressure of 13.3 Pa. After heating, the billet was subjected to hot drawing through four consecutive drawing lines in the stretching mode from 2 to 7%.

Description

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The invention relates to the field of metal forming and can be used in the manufacture of platinite wire, intended for the manufacture of vacuum and semiconductor devices.

A known method for producing a platinite wire includes assembling a ferro-nickel core with a copper tube, winding the end of the resulting bag, heating in hydrogen at 600-800 ° C and compressing it with wire.

The known method does not allow to obtain a platinite wire in accordance with the requirements of the technology of making vacuum bushings through glass shells.

The closest in technical essence to the claimed method is the production of platinum wire, including the continuous supply of a ferronickel core and a copper tape, degreasing and cleaning the contacting surfaces in a protective gas environment, forming a blank by forming a tape, welding its edges and pressing around the core , heating and rolling-pressing the workpiece to a given size.

A disadvantage of the known method is the absence of a reliable vacuum tight bonding along the entire perimeter of the cross section of the platinite wire. This does not allow for a strong connection between the shell and the core. The lack of reliable and vacuum-tight bonding along the entire perimeter of the cross section of the platinite wire is due to the fact that due to stripping

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In this environment, the surfaces of the tape and core are covered with layers of tightly adsorbed gas molecules. because the cleaned surface is active and has an adsorption effect. After such a workpiece has been compressed, a protective gas can be found in the space between the tape and the core, which prevents the creation of a strong joint. The wire obtained according to the described method has low physicochemical characteristics and, as a result, a large percentage of rejects in garnosity and leakage.

The aim of the invention is to improve the quality of the wire by producing a vacuum-tight and durable joint.

The goal is achieved by the fact that in the known method of producing platinum wire, which includes the continuous supply of a ferronickel core and copper tape, degreasing and cleaning the contacting surfaces in a protective gas environment, forming a blank by forming a tape, welding its edges and pressing around the core, heating and according to the invention, after rolling in a gas medium, rolling-pressing the preform is done by treating the contacting surfaces of the core and the tape in a vacuum of 6.6-13.3 Pa and soon up to 3-5 m / min until the surface roughness of the core is Ra 0.8–1.5 µm and tape Rz 10–20 µm, the blank is formed in the same vacuum, the crimping is performed with compression from 3 to 8%, the blank heated to 850-920 ° C and the process of rolling-km-pressing is carried out according to the mode of stretching increase from 2 to 7%.

In this case, nitrogen is used as the protective gas at an overpressure of 1-3 KPa.

The invention is illustrated by the following example.

The source materials are: MB grade heat-treated tape, 0.7 x 45+ mm in size, wire - 43N diameter Ronickel grade

A roll of copper tape weighing 250 kg and a riot of wire weighing 1000 kg was laid on the retractor devices. The tape through the correct machine and installation of trimming edges submitted to installation of degreasing. At the same time, the wire was set in the correct machine for the core and sent to the pre-degreasing bath, where anticorrosive grease was removed in trichlorethylene medium.

The tape and wire were then set in a joint degreasing unit with trichloroethylene using ultrasound.

The defatted tape and wire were fed to the stripping machines, where the tape was cleaned with metal brushes in a nitrogen atmosphere, and the wire with needle-cutters in the air.

Stripped tape and wire through

special locks entered the vacuum chamber with a residual pressure of 13.3 Pa, where the tape was formed around the wire into a tube of diameters 12.7 mm.

The edges of the tape were welded by an electron beam according to the following conditions: gun voltage 26 KV, current of the gun ZOA, welding speed 3 m / min. Then the tube was pressed in vacuum around the wire in a die with a degree of tube deformation of 7.0%. The billet obtained by the described method was submitted to an induction heating unit, where it was heated to a temperature of 850 ° C, at a residual pressure of 13.3 Pa. After

heating the billet was hot-drawn through four consecutive drag lines. The diameter of the workpiece after drawing in the first track 9.10 mm, after drawing in the second thread 8.80 mm,

after the third and fourth 8.50 mm. Then the billet was cooled with a water shower and wound into a riot weighing up to 150 kg.

Samples of the platinite wire obtained from the line were tested for the strength of the connection of the copper sheath with the core, which was determined by testing the samples for shear.

For the base object of the received wire, obtained by the existing technology.

the production of tubular platinite, in which solid copper tube (sheath) and a ferronickel bar (core) are used as starting materials.

Comparison of the test results showed that the wire obtained by the proposed method has a shear strength of 190 ... 210 MPa, while the wire obtained by the known technology,

U0 ... 150MPa.

Metallographic analysis of the contact zone showed that the wire obtained by a known method has single pores and oxidation, and on the wire obtained by

the proposed method, there are no defects.

Samples of finished platinite wire were examined for compliance with industry standard requirements and were tested during technological testing on

vacuum density in consumer electronics products. Marriage on gassiness and leakage decreased from 0.5 to 0.18%.

Technical and economic advantages in comparison with the prototype are

emission of platinite wire with a guaranteed vacuum-tight durable connection between the shell and the core, which significantly improves the quality of electronic devices, including their durability.

The economic effect from the introduction of the proposed method will be 350 thousand rubles.

Claims (2)

Claim 1. Method for producing platinite wire, including feeding a ferronickel core and copper tape, degreasing and stripping contacting surfaces in a protective gas, forming the workpiece by forming a tape, welding its edges and pressing around the core, heating and rolling-ressing characterized in that, in order to improve the quality wire by increasing the vacuum density and strength of the connection of the core with the shell after stripping in a gas environment, the processing of contacting surfaces of the core and tape in vacuum of 6.6-13.3 Pa, at a speed of 3-5 m / min to obtain a roughness of the surface of the core Ra 0.8-1.5 µm and tape 10-20 µm, the formation of the workpiece is carried out in this In the same vacuum, pressure testing is carried out with compression from 3 to 8%, the billet is heated to 850– 920 ° C, and the rolling-pressing process is carried out according to the stretching increase mode from 2 to 7%. 15 2. A method according to claim 1, characterized in that nitrogen is used as the protective gas at an overpressure of 1-3 kPa.