SU1675290A1 - Method of manufacturing an envelope joint of pyrolytic boron nitride with a metal - Google Patents

Abstract

The invention relates to the technology of joining dissimilar materials and can be used in the manufacture of metal-dielectric assemblies for the electronic, electronic and instrument-making industries. The purpose of the invention is to increase the yield of suitable vacuum-tight connections with a diameter greater than 60 mm. The pyrolytic boron nitride disk is placed with a gap for brazing inside the copper cuff, the outer diameter D of which is determined from the ratio D (1.19 ± 0.01) d, where d is the outer diameter of the disk, mm. On the cuff wear molybdenum bandage. Solder PSR 72 V in the form of a wire is placed on the border of the disk and cuff, in the form of a foil between the cuff and bandage. Brazing was carried out at 860 ± 20 ° C argon atmosphere. Vacuum tight junctions up to 130 mm in diameter were obtained, the yield was 90-100%. 1 tab. Ј Ј

Description

The invention relates to the technology of joining dissimilar materials, in particular to methods of combining pyrolytic boron nitride (PNB) with metal, and can be used in the manufacture of metal-dielectric assemblies for the electronic, radio-electronic instrument-making industry.

The purpose of the invention is to increase the yield of suitable vacuum-tight connections with a diameter greater than 60 mm.

Example. The disk from PNB is placed in a copper cuff on which molybdenum bandage is worn. Disks of PNB with a diameter of 66, 82, 92, 102, 123 and 130 mm with copper cuffs with diameters selected from the ratio D (1.19 ± 0.01) are placed

d, where d is the diameter of the disk PNB Solder PSR 72 V in the form of a wire is placed on the border of the disk with the cuff, and in the form of a foil - between the cuff and bandage. The soldering of assembly units is carried out by the contact-reactive method in argon at 860 ± 20 ° C. For comparison, connections were made in accordance with a known method of similar dimensions, in which the cuff thickness is 0.8-1 mm and the solder is placed only on the edge of the disk with the cuff and was absent between the cuff and bandage. the density of the compound that is tested on a PTI-7A helium leak detector. The results are shown in the table.

Os

vj SL Yu Yu Oh

The use of the proposed method provides, compared with the known, a significant increase in the yield of solids after soldering, while with an increase in the dimensions of the joint of more than 100 mm, the proposed method opens up the possibility of obtaining large-sized compounds with PPF, since the manufacture of such compounds by the existing method is not carried out due to the practically zero yield of vacuum density.

Metal-dielectric connections with PNB, obtained by the proposed method, are highly reliable. They retain a vacuum density after 30 cycles of heating and cooling in a nitrogen-hydrogen medium with a temperature change at a rate of 25-35 ° C per minute.

The use of the proposed method for obtaining metal-dielectric compounds covering provides, in comparison with the known method, an increase in

yield of vacuum density of metal-dielectric compounds by 60–80% and the possibility of obtaining reliable large-sized (over

100 mm) connections.

Claims (1)

The invention method of obtaining pyrolitic boron nitride with metal covering a spa, including placing a disk of pyrolytic boron nitride inside a copper cuff with a bandage of molybdenum, placing copper eutectic solder on the border of the disk with a cuff and then soldering them, so that the yield of vacuum-tight joints with a diameter of more than 60 mm, the cuff is made with an outer diameter D, which is chosen from the ratio D (1.19 ± 0.01) d, where d is the outer diameter of the disk, mm, and d brazing solder is further disposed a foil between the sleeve and the shroud.