DE102013018465A1 - Body made of a brittle material and a metallic material and a method for producing a material connection of a brittle material and a metallic material - Google Patents

Abstract

The invention comprises a body (100), comprising at least one brittle-fractured material (1), in particular a glass ceramic, a glass or a ceramic and a metallic material (3), characterized in that the brittle material (1) with the metallic material (1). 3) a high-temperature-resistant, material-locking compound for temperatures of more than 250 ° C, in particular more than 300 ° C, preferably more than 400 ° C, in particular more than 500 ° C, forms and the compound of brittle material (1) and metallic material (3) an intermediate layer (20) between the brittle material (3) and the metallic material (1), in particular an intermediate layer (20) of a ductile metal having an elongation at break ≥ 1%, preferably ≥ 2%, in particular ≥ 4% , very preferably ≥ 10%, in particular in the range 1% to 20%, very particularly preferably in the range 2% to 15%.

Description

The invention relates to a body, comprising at least one brittle material, in particular a glass ceramic, a glass or a ceramic and a metallic material and a method for producing a material connection of a brittle material and a metallic material.

In order to combine brittle materials such as glass, glass ceramic, ceramic with metallic materials, various possibilities are described in the prior art, which always results in the problem that such compounds of the prior art not for the high temperature range a reliable cohesive connection available put.

Another problem is when such a compound of a brittle material and a metallic material are exposed to temperature changes with a temperature difference of more than 250 K. In such cases, the bodies tend to break at the junction.

To solve the problem of thermal shock resistance, the use of metallic materials which are largely adapted in the desired application in their expansion behavior of the brittle material, in particular the glass, the glass ceramic or the ceramic, in the prior art. Here, however, problems arise in the temperature range above 250 ° C.

Another possibility, discussed in the prior art, is the integral connection with the aid of a bonding of metallic material and brittle material, wherein the adhesive, due to its elastic property, compensates for the different thermal expansions of the materials to be joined. Examples of such adhesives in the prior art are, for example, silicone adhesives. A disadvantage of such a cohesive connection, however, is that the temperature resistance is usually limited to temperatures less than 250 ° C. There are also adhesives known that can withstand more than 300 ° C, but only for a limited time.

Another possibility of a cohesive connection is to lower by means of intermediate glasses or glass solders, the stresses arising in the connection between the brittle material and the metallic material. However, the problem also arises for such a solution that the difference in the thermal expansion of the brittle material and metallic material can not be compensated for temperature changes of over 250 K.

Another possibility is to make the desired connection between a brittle material and a metallic material not cohesively, but constructively produce, for example by a clamp or screw. Here, however, there is a disadvantage in that the different thermal expansions in the components involved, in particular the Verschraubungskomponenten, can not be sufficiently compensated so that fracture-relevant stresses in the brittle material are reliably avoided. Another disadvantage of a constructive bond of brittle material and metallic material are far-reaching restrictions on the possible geometric design of the compound.

The object of the invention is therefore to solve the aforementioned problems and to provide a body or a material connection between a brittle material and another metallic material which is suitable for the high temperature range.

According to the invention, this object is achieved in that a body consists at least of a brittle material, in particular a glass ceramic, a glass or a ceramic and a metallic material, and the brittle material with the metallic material, a high-temperature, cohesive connection for temperatures of more than 250 ° C, in particular more than 350 ° C, preferably more than 400 ° C, in particular more than 500 ° C forms, is provided.

According to the invention it is provided that the connection of brittle material and metallic material comprises an intermediate layer between the brittle material and the metallic material, in particular an intermediate layer of a ductile metal. The intermediate layer ensures that the connection between the brittle material and the metallic material is made. Furthermore, stresses between the brittle material and the metallic material can be at least partially reduced by the intermediate layer. In the present application, ductile metals are understood as meaning those having an elongation at break ≥ 1%, preferably ≥ 10%, in particular in the range from 1% to 20%, preferably from 2% to 15%.

Particularly preferred materials having an elongation at break in the range according to the invention are, for example, the pure aluminum foil Al 99.5 - smooth, soft, bright rolled - ALUJET from ALUJET GmbH, Ahornstraße 16, D82291 Mammendorf, which, at a thickness in the range of 0.05 mm to 0.30 mm, has an elongation at break transversely of ≥ 4% and an elongation at break of ≥ 4%, or an aluminum foil 7800 from 3M Deutschland GmbH, Carl-Schurz-Str. 1, which also has an elongation at break ≥ 4% at a film thickness of 0.05 mm.

In the compound according to the invention some of the stresses are elastically degraded by the intermediate layer, above 100 ° C by flowing, but it can residual stresses remain.

It is particularly preferred if the brittle material with the metallic material forms a high-temperature, cohesive connection for temperatures> 400 ° C., preferably> 500 ° C. Furthermore, it is preferred if a thermal shock resistance is given at temperature differences of more than 250 K.

A particularly preferred embodiment is that the brittle material is a low-expansion material in a temperature range of 20 ° C to 300 ° C. In this application, a material, in particular a glass ceramic or a glass with a thermal coefficient of linear expansion α _brittle (20 ° C.-300 ° C.) ≦ 4 × 10 ^-6 / K, in particular in the range -1.0 × 10 -3 ° C., is used under low-expansion brittle-fracture materials ^{. 6} / K ≦ α _brittle ≦ 4 × 10 ^-6 / K, particularly preferably -0.6 × 10 ^-6 / K ≦ α _brittle ≦ 2 × 10 ^-6 / K.

Exemplary materials having a thermal Aausdehnungskoeffizienten in this field are, for example, Li-Al-Si glass ceramics such as glass ceramics ROBAX ^®, ceramic ^® and Nextrema ^® of the company Schott AG, Mainz, having a coefficient of thermal expansion in the temperature range of 20 ° C to 300 ° C in the range of -0.3 to 1.0 · 10 ^-6 / K have.

As a glass material, for example, a borosilicate glass can be used, for. Borofloat ^33® . The glass material Borofloat33 ^® has a thermal coefficient of _{linear expansion} α _brittle (20 ° C-300 ° C) of 3.3 10 ^-6 / K.

The preferred metallic material is a metallic material having a thermal coefficient of linear expansion α _metal in the temperature range from 20 ° C. to 300 ° C., for which the following applies: α _metal ≦ 20 × 10 ^-6 / K, in particular in the range 4.0 × 10 ^-6 / K ≦ α _metal ≤ 6 · 10 ^-6 / K, used. A particularly preferred metallic material is KOVAR. Alternatively, molybdenum, steel, tungsten or stainless steel are possible. KOVAR is an iron-cobalt-nickel alloy.

It is particularly preferred if the metallic material is selected depending on the brittle material in such a way that the metallic material has a thermal expansion coefficient α _metal (20 ° C-300 ° C) in the range α _brittle - 10 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 10 · 10 ^-6 / K, preferably α _brittle - 8 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 8 · 10 ^-6 / K, especially α _brittle - 5 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 5 · 10 ^-6 / K.

The connection of brittle material and metallic material is preferably carried out by means of welding, in particular ultrasonic welding. The ultrasonic welding takes place in the usual frequency range of 15 to 50 kHz, preferably at 20 kHz.

Regarding the ultrasonic welding method is applied to the DE 199 17 133 A1 referenced, in detail the welding of a workpiece made of glass, glass ceramic and / or ceramic, that is, a brittle, inorganic, poorly heat-conductive material with low long range order and a workpiece thereof from various material, such as a metal is described. The disclosure of the DE 199 17 133 A1 is fully incorporated in the present application.

The welding, in particular with ultrasonic welding apparatuses, between the brittle material and the metallic material takes place between a first connection surface on the brittle material and a second connection surface on the metallic material. Between first and second bonding surface, the intermediate layer is introduced. The welding can be carried out flat or even partial area, wherein a partial area welding depending on the geometry of a spot welding, a seam welding or torsional welding can be.

A body or composite, comprising the brittle material and the metallic material surprisingly despite the different thermal expansions of the two joining partners, here the brittle material and the metallic material, a permanently temperature-resistant compound above 250 ° C, especially above 300 ° C. , Particularly preferably, the permanent temperature resistance up to temperatures of 400 ° C, particularly preferably up to 500 ° C, achieved. Even temperature changes of over 250 K, the compound thus prepared withstand, even if the brittle material has a low or zero expansion.

According to the invention, an intermediate layer is introduced between the brittle material and the metallic material. The intermediate layer is preferably made of a ductile metal, preferably of aluminum, in particular high-purity aluminum or else gold or a gold alloy. The thickness of such an intermediate layer is preferably in the range of 50 and 200 μm.

In addition to the intermediate layer, provision may be made for pretreating the first and / or second connecting surface, which is connected by means of ultrasonic welding as a joining method. This is particularly advantageous for the brittle material. In question, for example, come thermal or chemical toughening or a strength-enhancing coating. Surprisingly, it has also been shown that an improvement in the temperature and / or thermal shock resistance can be achieved by local and / or full-area etching or polishing of the bonding surface of the brittle material. The connection of brittle material and metallic material by means of ultrasonic welding can be done very quickly. Thus, such a connection can be made by spot and / or torsional welding in short times. Times of less than 10 seconds are possible, preferably less than 5 seconds, in particular even less than 1 second.

In addition to the body or the composite of a brittle material and a metallic material, the invention also includes a method for producing a cohesive connection of a brittle material and a metallic material, wherein in the method according to the invention the following steps are performed: First, a brittle, is preferred essentially low-expansion material, preferably a glass, a glass-ceramic or a ceramic with a thermal coefficient of _{linear expansion} α _brittle (20 ° C.-300 ° C.) ≦ 4 × 10 ^-6 / K, in particular α _brittle (20 ° C.-300 ° C.) ≦ 2 × 10 ^-6 / K, preferably in the range -1 × 10 ^-6 / K, ≦ α _brittle ≦ 4 × 10 ^-6 / K, in particular in the range -0.6 × 10 ^-6 / K ≦ α _brittle ≦ 2 × 10 ^-6 / K, for example a Li-Al-Si glass-ceramic, provided with a first connection surface.

Furthermore, a metallic material having a thermal coefficient of linear expansion α in the temperature range from 20 ° C. to 300 ° C., for which α _metal (20 ° C.-300 ° C.) ≦ 20 × 10 ^-6 / K, in particular in the range 4 × 10 ^-6 / K ≤ α _metal ≤ 6 · 10 ^-6 / K, for example KOVAR, provided with a second bonding surface.

Then, the brittle material with the metallic material cohesively in the region of the first and second bonding surface via an intermediate layer which is introduced between the first and second bonding surface, wherein the intermediate layer is preferably made of a ductile metal, in particular aluminum, preferably pure aluminum, an aluminum alloy, gold or a gold alloy, preferably with a thickness between 50 microns and 200 microns, connected together. As a result, a high temperature resistant compound for temperatures of more than 250 ° C, preferably more than 300 ° C and / or a thermal shock resistance of more than 250 K, provided.

The brittle material is connected to the metallic material by a joining process, in particular welding, in particular ultrasonic welding, preferably in the form of spot welding, seam welding or torsional welding.

Particularly high temperature resistant compounds, in particular with regard to thermal shock resistance, are achieved when in particular the first bonding surface of the brittle material is treated. Here it is possible biasing, smoothing, nubs, structuring, partial or full-area etching, polishing and / or ion exchange.

The invention will be described below with reference to the figures.

It shows:

1 a body according to the invention of a brittle material and a metallic material.

In 1 is a body according to the invention 100 represented, consisting of a brittle material 1 and a metallic material 3 , The brittle material 1 can be, for example but not limited to a substantially nullausdehnendes material such as a Li-Al-Si glass ceramic, in particular ROBAX ^® of the company Schott AG, Mainz. Such substantially zero-expansion material has a mean thermal expansion coefficient α _brittle (20 ° C-300 ° C) <0.15 · 10 ^-6 / K.

In the metallic material 3 it is essentially a metallic material with a thermal coefficient of linear expansion α _metal (20 ° C-300 ° C) ≤ 6 · 10 ^-6 / K in the temperature range from 20 ° C to 300 ° C.

A particularly preferred metallic material is KOVAR.

Also shown is the first connection surface 10 of the brittle material and the second bonding surface 12 of the metallic material. In the area of first and second connection surface 10 . 12 is the metallic material 3 with the brittle material 1 cohesively, for example, by a welding process as a joining process, connected.

In the in 1 As shown embodiment, the material connection between the first connection surface is made 10 and the second connection surface 12 over an intermediate layer 20 of a ductile metal with an elongation at break greater than 1%. A ductile metal is in particular aluminum, pure aluminum, high-purity aluminum or gold, preferably as a film.

The cohesive connection is preferably carried out by welding, in particular ultrasonic welding in a relatively short time in preferably less than 10 seconds, in particular less than 5 seconds, in particular even less than 1 second, without being limited thereto.

A particularly temperature-resistant compound, in particular with high thermal shock resistance of more than 250 K is achieved when the first connection surface 10 of the brittle material 1 is treated. Here is conceivable a thermal or chemical tempering and / or a strength-increasing coating, a local or full-area etching or polishing. Below is based on embodiments, the connection of a brittle material 1 be described with a metallic material including an intermediate layer.

1st embodiment

In a first embodiment, the sprödbrüchige material from the glass-ceramic consists Robax ^® having an average thermal expansion coefficient α _20-300 of -0.3 x 10 ^-6 / K. The surface intended for connection to a metallic shaped body is a flat surface formed in a rolling process. The intermediate layer of ductile material is an aluminum foil EN-AW-1050A with a thickness of 0.1 mm for use. The metallic molded body consists of a 0.5 mm thick and 22 mm in diameter measuring flat base plate made of the material Kovar with a mean thermal expansion coefficient α _20-300 of 5.5 · 10 ^-6 / K. On the base plate centric and placed perpendicular to her is a firmly connected to the base plate threaded bolt with a height of 12 mm and a diameter of 8 mm for further mounting options according to the further application of the component according to the invention.

In a torsional ultrasonic welding process, the glass ceramic Robax, the intermediate layer of aluminum and the Kovar base plate are welded together with the help of a sonotrode in the form of a hollow cylinder with front side rutting, wherein the front side of the sonotrode touches the Kovar base plate and a torsional vibration performs. The sonotrode amplitude is 25 μm, the sonotrode frequency is 20 kHz, the welding pressure is 2.0 bar and the welding power is 800 Ws.

The composite body thus produced has a surface connection between the Robax glass ceramic and the intermediate layer of aluminum, on the other hand, and at the same time a connection between the intermediate layer of aluminum and the Kovar base plate. The contact surface produced in the welding process is approximately 1.5 cm ² . A subsequent thermal stress caused by 100 temperature changes between room temperature 25 ° C and maximum temperature 350 ° C, the composite body without visible damage. A test of the resistance of the compound by a mechanical load test resulted in a shear strength of at least 700 N.

2nd embodiment

In a second exemplary embodiment, the brittle material consists of the glass ceramic ^Ceran® with a mean thermal expansion coefficient α _20-300 of -0.2 × 10 ^-6 / K. The surface intended for connection to a metallic molding is a surface formed in a rolling process with the nub structure known from the application as a cooking surface. The intermediate layer of ductile material is an aluminum foil EN-AW-1050A with a thickness of 0.1 mm for use. The metallic molded body consists of a 0.5 mm thick and 22 mm in diameter measuring flat base plate made of the material Kovar with a mean thermal expansion coefficient α _20-300 of 5.5 · 10 ^-6 / K. On the base plate centric and placed perpendicular to her is a firmly connected to the base plate threaded bolt with a height of 12 mm and a diameter of 8 mm for further mounting options according to the further application of the component according to the invention.

In a torsional ultrasonic welding process, the glass ceramic Ceran, the intermediate layer of aluminum and the Kovar base plate are welded together using a sonotrode in the form of a hollow cylinder with frontal Rautierung, the front side of the sonotrode touches the Kovar base plate and a torsional vibration performs. The sonotrode amplitude is 25 μm, the sonotrode frequency is 20 kHz, the welding pressure is 1.5 bar and the welding power is 500 Ws.

The composite body thus produced has a connection between those in the contact area On the other hand, and at the same time a connection between the intermediate layer of aluminum and the Kovar base plate located Nubpenkuppen the Ceran glass ceramic and the intermediate layer of aluminum. A subsequent thermal stress caused by 100 temperature changes between room temperature 25 ° C and maximum temperature 350 ° C, the composite body without visible damage. A test of the resistance of the compound by a mechanical load test resulted in a shear strength of at least 700 N.

3rd embodiment

In a third embodiment, the sprödbrüchige material from the glass-ceramic consists Robax ^® having an average thermal expansion coefficient α _20-300 of -0.3 x 10 ^-6 / K. The surface intended for connection to a metallic shaped body is a flat surface formed in a rolling process with subsequent polishing in the region of the subsequent contact surface. The intermediate layer of ductile material is an aluminum foil EN-AW-1050A with a thickness of 0.1 mm for use. The metallic molded body consists of a 0.5 mm thick and 22 mm in diameter measuring flat base plate made of the material Kovar with a mean thermal expansion coefficient α _20-300 of 5.5 · 10 ^-6 / K. On the base plate centric and placed perpendicular to her is a firmly connected to the base plate threaded bolt with a height of 12 mm and a diameter of 8 mm for further mounting options according to the further application of the component according to the invention.

In a torsional ultrasonic welding process, the glass ceramic Robax, the intermediate layer of aluminum and the Kovar base plate are welded together with the help of a sonotrode in the form of a hollow cylinder with frontal rauting, the front side of the sonotrode resting on the Kovar base plate and a torsional vibration performs. The sonotrode amplitude is 25 μm, the sonotrode frequency is 20 kHz, the welding pressure is 2.0 bar and the welding power is 750 Ws.

The composite body thus produced has a surface connection between the Robax glass ceramic and the intermediate layer of aluminum, on the other hand, and at the same time a connection between the intermediate layer of aluminum and the Kovar base plate. The contact surface produced in the welding process is approximately 1.5 cm ² . A subsequent thermal stress by 100 temperature changes between room temperature 25 ° C and maximum temperature 400 ° C survives the composite body without visible damage. A test of the resistance of the compound by a mechanical load test resulted in a shear strength of 3800 N.

4th embodiment

In a fourth embodiment, the brittle material consists of the glass Borofloat 33 ^® with a mean thermal expansion coefficient α _20-300 of 3.3 · 10 ^-6 / K. The surface intended for connection to a metallic shaped body is a fire-polished surface formed in a float process. The intermediate layer of ductile material is an aluminum foil EN-AW-1050A with a thickness of 0.1 mm for use. The metallic molded body consists of a 0.5 mm thick and 22 mm in diameter measuring flat base plate made of the material Kovar with a mean thermal expansion coefficient α _20-300 of 5.5 · 10 ^-6 / K. On the base plate centric and placed perpendicular to her is a firmly connected to the base plate threaded bolt with a height of 12 mm and a diameter of 8 mm for further mounting options according to the further application of the component according to the invention.

In a torsional ultrasonic welding process, the glass Borofloat 33, the intermediate layer of aluminum and the Kovar base plate are welded together using a sonotrode in the form of a hollow cylinder with frontal Rautierung, with the front side of the sonotrode touches the Kovar base plate and a torsional Vibration takes place. The sonotrode amplitude is 25 μm, the sonotrode frequency is 20 kHz, the welding pressure is 2.0 bar and the welding energy is 700 Ws.

The composite body thus produced has a surface connection between the Borofloat 33 glass and the intermediate layer of aluminum, on the other hand, and at the same time a connection between the intermediate layer of aluminum and the Kovar base plate. The contact surface produced in the welding process is approximately 1.5 cm ² . A subsequent thermal stress caused by 100 temperature changes between room temperature 25 ° C and maximum temperature 300 ° C, the composite body without visible damage. A test of the resistance of the compound by a mechanical stress test resulted in a shear strength of at least 500 N.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19917133 A1 [0020, 0020]

Cited non-patent literature

• EN-AW-1050A [0040]
• EN-AW-1050A [0043]
• EN-AW-1050A [0046]
• EN-AW-1050A [0049]

Claims (12)

Body ( 100 ) comprising at least one brittle-fracture material ( 1 ), in particular a glass ceramic, a glass or a ceramic and a metallic material ( 3 ), characterized in that the brittle material ( 1 ) with the metallic material ( 3 ) forms a high-temperature-resistant, material-bonding compound for temperatures of more than 250 ° C, in particular more than 300 ° C, preferably more than 400 ° C, in particular more than 500 ° C, and the compound of brittle material ( 1 ) and metallic material ( 3 ) an intermediate layer ( 20 ) between the brittle material ( 3 ) and the metallic material ( 1 ), in particular an intermediate layer ( 20 ) of a ductile metal having an elongation at break ≥ 1%, preferably ≥ 2%, in particular ≥ 4%, very preferably ≥ 10%, in particular in the range 1% to 20%, very particularly preferably in the range 2% to 15%. Body ( 100 ) according to claim 1, characterized in that the intermediate layer ( 20 ) is a film having a layer thickness ≤ 200 .mu.m, in particular in the range 20 .mu.m to 200 .mu.m, preferably 50 .mu.m to 150 .mu.m, particularly preferably 50 .mu.m to 100 .mu.m. Body ( 100 ) according to one of claims 1 to 2, characterized in that the ductile metal is aluminum or pure aluminum or pure aluminum or gold. Body ( 100 ) according to one of claims 1 to 3, characterized in that the brittle material ( 1 ) a low-expansion material in the temperature range 20 ° C to 300 ° C, preferably with a thermal coefficient of _{linear expansion} α _brittle (20 ° C-300 ° C) ≤ 4 · 10 ^-6 / K, in particular ≤ 2 · 10 ^-6 / K, preferably in the range -1.0 × 10 ^-6 / K ≦ α ≦ 4 × 10 ^-6 / K, particularly preferably -0.6 × 10 ^-6 / K ≦ α _brittle ≦ 2 × 10 ^-6 / K. Body according to claim 4, characterized in that the brittle material ( 1 ) is a glass ceramic, in particular a Li-Al-Si glass ceramic or a glass, in particular a borosilicate glass. Body according to at least one of claims 1 to 5, characterized in that the metallic material ( 3 ) a thermal expansion coefficient α _metal (20 ° C-300 ° C) ≤ 20 · 10 ^-6 / K, especially in the range 4 · 10 ^-6 / K ≤ α _metal (20 ° C-300 ° C) ≤ 6 · 10 ^-6 / K. Body according to one of claims 1 to 6, characterized in that the metallic material ( 3 ) is selected such that the thermal expansion coefficient α _metal (20 ° C to 300 ° C) in the range α _brittle - 10 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 10 · 10 ^-6 / K, preferably α _brittle - 8 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 8 · 10 ^-6 / K, in particular α _brittle - 5 · 10 ^-6 / K ≤ α _metal ≤ α _brittle + 5 · 10 ^-6 / K. Body according to one of claims 1 to 7, characterized in that the metallic material ( 3 ) Is tungsten or molybdenum or KOVAR or steel or stainless steel. Body according to one of claims 1 to 8, characterized in that the brittle material ( 1 ) in a region of the material connection a surface ( 10 ), wherein the surface is pretreated, in particular thermally or chemically prestressed and / or strength-enhancing coated and / or etched locally or over the entire surface and / or polished. A method for producing a material-locking connection of a brittle material and a metallic material, comprising the following steps: a _{brittle-brittle,} low-elongation material having a thermal coefficient of linear expansion α _brittle in the temperature range from 20 ° C to 300 ° C of α _brittle (20 ° C-300 ° C ) ≦ 4 × 10 ^-6 / K, in particular α _brittle ≦ 2 × 10 ^-6 / K, preferably in the range -1.0 × 10 ^-6 / K ≦ α _brittle ≦ 4 × 10 ^-6 / K, preferably -0 , 6 · 10 ^-6 / K α _brittle ≤ 2 · 10 ^-6 / K, with a first connection surface ( 10 ) made available; It is a metallic material with a thermal expansion coefficient α in the temperature range 20 ° C to 300 ° C with α _metal (20 ° C-300 ° C) ≤ 20 · 10 ^-6 / K, in particular in the range 4 · 10 ^-6 / K ≤ α _metal ≤ 6 · 10 ^-6 / K, with a second bonding surface ( 12 ), in particular KOVAR; - it becomes an intermediate layer ( 20 ) in particular of a ductile metal having an elongation at break ≥ 1%, preferably ≥ 2%, in particular ≥ 4%, very preferably ≥ 10%, in particular in the range 1% to 20%, very particularly preferably in the range 2% to 15%, preferably with a layer thickness ≤ 200 μm, in particular between 50 μm and 200 μm between the first connection surface ( 10 ) and the second interface ( 12 ) brought in; - the brittle material ( 1 ) is mixed with the metallic material ( 3 ) over the intermediate layer ( 20 ) materially connected such that a high temperature resistant compound for temperatures of more than 250 ° C, in particular more than 300 ° C, preferably more than 400 ° C, in particular more than 500 ° C, is provided. A method according to claim 10, characterized in that the brittle material ( 1 ) with the metallic material ( 3 ) is connected by welding, in particular ultrasonic welding, preferably in the form of spot welding, seam welding or torsion welding. Method according to one of claims 10 to 11, characterized in that the first connection surface is thermally or chemically biased and / or strength-enhancing coated and / or locally or fully etched and / or polished.

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