SU1611622A1 - Method of producing female cermet seals - Google Patents

Abstract

The invention relates to soldering, in particular, to the production of mismatched metal layers with ceramics. The purpose of the invention is to expand the technical possibilities for obtaining metal-ceramic units (MCC). Before soldering the ceramic part with its surrounding metal part, a groove adjacent to the section to be connected is made at the protruding end of the latter. The groove can be located on the outer or on the inner surface of the metal part, its walls can be perpendicular to the surface of the metal part or inclined with respect to the latter. The groove may also be V-shaped, and its base may be located in a plane extending along the edge of the joint portion. The method expands the choice of material for the surrounding parts of the MCU and reduces the limitation of its size. The presence of a groove increases the resistance of the junctions in the MCA to various thermal effects. 4 Cp. f-ly, 6 ill.

Description

The invention relates to soldering, in particular, to obtaining inconsistent metal junctions with ceramics, mainly vacuum-dense, in which the metal part, embracing the ceramic, stands for the plane of its end face at least on one side, and mechanical engineering, electronic, electrical and other industries.

The purpose of the invention is to expand the technical possibilities of obtaining metal-ceramic units (MKU).

Before soldering the ceramic part with the metal part that surrounds it on the protruding end of the metal part, a groove is made (mainly on the outer surface before the assembly of the MCA) adjacent to the section where the part of the MCU is connected. The groove wall closest to this area is advisable for smoothly reducing the stresses in the end edges of the ceramic part with inclination to the interface.

Making the groove is technically simpler to perform, but its business is equivalent to reducing the total length of the protruding end of the meta part, as in the prototype method. This practically eliminates the limitations on the thickness and length of the protruding end of the metal part used in the production of an MCI, eliminates the need for a compensating end and thereby contributes to a significant expansion of technical capabilities.

FIG. Figure 1 shows a rectangular-shaped groove made perpendicular to the axis of the metal part; in fig. 2 - rectangular groove, inclined with respect to the metal axis. comfy detail; in fig. 3 — V-groove groove; in fig. 4 - groove with a slope of the wall facing the connecting area; in fig. 5 - version with a V-shaped groove on the inner surface; in fig. 6 is a variant of the MKU with two differently protruding ends of the metal. 1 part and two-shaped grooves of different depth.

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(it depends, in particular, on the thickness and profile of the wall of the protruding ends) located on both sides of the joint area.

The method is carried out as follows.

At the beginning on the surface of the metal cylinder 1 in the required place by a known technique, for example by cutting, cutting, roller rolling, etc. Sampling 2 is performed. The depth of the latter is chosen so that when the ceramic part — disc 3 is compressed, the deformation (bending) of the protruding end of the metal part does not lead to destruction of the ceramic part and zone 4 of the contact (spa), and was perceived 5. I Preliminary (before assembling of parts | MKU) the groove is preliminary, because it excludes any chance of damage to the ceramic part, especially if precision expensive sapphire glass is used as the last ski However, if the wall thickness of the metal cylinder is sufficiently large, and the dimensions of the dielectric disk allow this, a trench may be performed even after the assembly of the components of the MCU is completed, although in this case there may be some difficulties in performing this Operation.

Since races 5 at its bend can have a certain force impact on the angular edge 6 of disk 3 (for | MKU with one-sidedly protruding end, EG. 1-5) or on edges 6 and 7 (for MKU with two protruding ends, FIG. 6), and also on the contact areas 4 adjacent to these edges, to compensate for this effect, it is advisable to make the wall of the groove facing the joint area inclined to intersect the frontal plane and the cutting edge of the upper side facing the groove. compounds, reducing its thickness by pared with the rest of its central portion (e.g., FIGS. 2 and 4) and, respectively, the compressive force. Thus, the indicated impact of the isthmus is compensated by a decrease in the thickness of the adjacent area and the associated proportional decrease in compressive forces, with the result that the latter are evenly distributed (it becomes possible to regulate this distribution) along the entire length of the contact zone 4.

After the groove has been made, the metal and ceramic parts are assembled using the known technology (placing a solder layer between them, if necessary) and then they are joined by soldering.

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The method was tested on the example of the joining of flange disks with a diameter of 41 mm and a thickness of 1.8 and 2 mm and a diameter of 26 mm with a thickness of 3 mm with covalent cylinders with a length of 30 mm and a thickness of 1.5 and 2 mm. Annular grooves were made on the cylinder with the formation of an isthmus with a thickness of 0, 0.5 mm and a width of 1 mm.

Comparisons of vacuum density and heat resistance of the obtained compounds with compounds made according to the known technology, with a steak thickness of a protruding end of a metal part of 0.5 mm, showed the identity of their properties.

The application of the invention clears the choice of material for the female part of the assembly and reduces the limitations on its size, allows to use metal parts with identical thick walls along the length to make an MCA, providing, in particular in the latter case, various structural elements on the projecting end of the MCA. - threads, technological flanging, etc.

In addition, the rails between the joint area and the protruding end can function both as thermal resistance, reducing the effect of thermal shocks on junctions, at the moments when the MKU is welded to another product, or as a damper that protects the area of connection of the MKU parts from mechanical effects when performing these structural elements and other, for example, assembly, work, which generally contributes to an increase in the service life of metal-ceramic compounds.

Claims (5)

1. A method of obtaining encompassing metal-ceramic junctions in which a ceramic-covering metal (the metal part protrudes beyond the bounding area at least on one side of the joint, characterized in that, in order to expand the technical possibilities of metal-ceramic assemblies, on the surface of the protruding part of the metal the parts before soldering make a groove adjacent to the section to be joined. 2. A method according to claim 1, characterized in that the groove is made on the outer surface of the metal part. 3. The method according to claim 2, characterized in that the wall of the groove facing the joint is inclined in its direction. 4. Method according to paragraphs. 1 and 3, characterized in that the groove is V-shaped. 5. A method according to claim 4, characterized in that the base of the groove is located in a plane extending along the edge of the joint section. FIG. H FIG. / 2/2 R 7 /, FIG. 6