DE102015223449A1 - Electric device with a wrapping compound - Google Patents

Abstract

An electrical device with an electrical component (12) which is at least partially enveloped by an encapsulation compound (20) having a cement compound (22) is proposed, wherein the encasing compound (20) comprises a layer system (22) comprising at least two discrete layers (22 ), each having a cement composition (22, 22 ', 22' ').

Description

The present invention relates to an electrical device with an electrical component, which is at least partially enveloped by a Umhüllmasse and a method for producing such an electrical device.

State of the art

Increasing reliability and efficiency, as well as lowering the cost of power electronics modules and robust sensor systems, are of paramount importance today. The current wrapping materials (epoxy compounds, silicone compounds) are limited to a temperature range below 200 ° C. By exploiting the temperature range of up to 300 ° C or 350 ° C for wrapping materials, the operating range of modern power semiconductors (eg SiC) can be extended beyond 200 ° C, without the additional function of a wrapping material (eg protection from environmental influences, improved Thermal) must be waived.

From the DE102013112267A1 is a semiconductor module with a semiconductor device covering a covering mass of various cementates known. In this case, the encapsulation compound furthermore has a protective layer and an adhesion-promoting layer, both of which contain no cement.

Disclosure of the invention

The subject matter of the present invention is an electrical device with an electrical component which is at least partially enveloped by an encasing compound having a cement compound, the encasing compound having a layer system of at least two discrete layers each having a cement mass.

• – Bereitstellen mindestens einer ersten und einer zweiten Zementmasse;
• – Aufbringen der ersten Zementmasse als erste diskrete Schicht auf das elektrische Bauteil derart, dass das elektrische Bauteil zumindest teilweise umhüllt wird;
• – Aufbringen der zweiten Zementmasse als zweite diskrete Schicht auf die erste diskrete Schicht, um ein Schichtsystem der Umhüllmasse zu bilden; und
• – Behandeln mindestens einer der Zementmassen der diskreten Schichten.

The present invention furthermore relates to a method for producing an electrical device with an electrical component, which is at least partially enveloped by an encapsulation compound having a cement compound, with the following steps:

• - providing at least a first and a second cement paste;
• - Applying the first cement paste as a first discrete layer on the electrical component such that the electrical component is at least partially enveloped;
• Applying the second cement paste as a second discrete layer to the first discrete layer to form a layer system of the encapsulant; and
• Treating at least one of the cement masses of the discrete layers.

The present invention furthermore relates to the use of a layer system as encasing compound for an electrical component of an electrical device, wherein the layer system has at least two discrete layers each having a cement compound.

The electrical component may, for example, be a semiconductor component, a sensor element, an inductance, a capacitance, a battery cell, a battery module or a circuit arrangement. In the context of the present invention, however, an electrical component can be understood as meaning any active and passive component or high-performance component. The electrical device may in this case have a carrier substrate on which the electrical component is arranged.

Under a cement can be understood in the context of the present invention, an inorganic, metal-free, hydraulic binder. The cement hardens hydraulically, i. it undergoes a chemical reaction with water to form stable, insoluble compounds. Here, the cement may be formed at the beginning of the process or prior to hydration as finely ground powder, which reacts with water or addition of water with the formation of hydrates, solidifies and hardens. The hydrates can form needles and / or platelets, which interlock and thus lead to a high strength of the cement. In contrast, a phosphate cement does not harden hydraulically. An acid-base reaction takes place to form a salt gel, which later solidifies to a mostly amorphous mass. In the acid-base reaction, H + (hydrogen ions) are exchanged.

The cement may consist predominantly of calcium aluminates and form calcium aluminate hydrates during hydration. It is advantageous if the cement paste has alumina cement, in particular consists of alumina cement. Alumina cement (abbreviated CAC) is after DIN EN 14647 European regulated. Alumina cement consists predominantly of monocalcium aluminate (CaO.Al ₂ O ₃ ).

• – Al2O3: größer oder gleich 67,8 Gew.-%
• – CaO: kleiner oder gleich 31,0 Gew.-%
• – SiO2: kleiner oder gleich 0,8 Gew.-%
• – Fe2O3: kleiner oder gleich 0,4 Gew.-%

The alumina cement may, for example, have the following composition:

• Al2O3: greater than or equal to 67.8% by weight
• - CaO: less than or equal to 31.0% by weight
• SiO 2: less than or equal to 0.8% by weight
• Fe2O3: less than or equal to 0.4% by weight

• – Bindemittel Tonerdezement: größer oder gleich 8 Gew.-% bis kleiner oder gleich 47 Gew.-% (bspw. SECAR 71)
• – Reaktionsmittel Wasser: größer oder gleich 10 Gew.-% bis kleiner oder gleich 28 Gew.-%
• – Füllstoff: größer oder gleich 25 Gew.-% bis kleiner oder gleich 82 Gew.-%

In the context of the present invention, a discrete layer can be understood as meaning a layer which has defined interfaces to its surroundings. Accordingly, each discrete layer forms its own unit. Each discrete layer can be largely homogeneous have chemical and / or physical properties. The discrete layers may differ in their chemical and / or physical properties. At least one of the discrete layers may be formed as a cement composite. In other words, the discrete layer may have a cement matrix with a filler and / or additive and / or cementing agent. The discrete layers may have the following composition:

• Binder alumina cement: greater than or equal to 8% by weight to less than or equal to 47% by weight (eg SECAR 71)
• - Reactant water: greater than or equal to 10 wt .-% to less than or equal to 28 wt .-%
• Filler: greater than or equal to 25% by weight to less than or equal to 82% by weight

• – Al2O3: fein d50 ca. 1 µm bis grob d50 ca. 150–200 µm
• – Alpha-Si3N4: fein ca. 1 µm bis grob ca. 100 µm
• – Hex. BN: fein ca 15 µm bis grob ca. 250 µm
• – SiC: fein ca. 10–50 µm bis grob ca. 600 µm
• – AlN: fein ca. 1 µm bis grob ca. 100 µm

The filler may be selected from the group consisting of:

• - Al2O3: fine d50 approx. 1 μm to roughly d50 approx. 150-200 μm
• - Alpha-Si3N4: fine about 1 μm to roughly 100 μm
• - Hex. BN: fine about 15 microns to roughly 250 microns
• - SiC: fine about 10-50 microns to roughly 600 microns
• AlN: fine about 1 μm to roughly 100 μm

The cement compositions may e.g. be applied by means of a printing process, spraying process and / or casting process.

In the context of the present invention, a step of treating can be understood as meaning a hardening step or a reaction step. The step of treating may include, for example, a dipping process. The step of treating may also include only a partial treatment of the cement mass (s) or the cement layer (s). In other words, during treatment, a partial or complete treatment of the cement mass (s) or cement layer (s) can take place. In the step of treating, for example, after applying the first cement paste as the first discrete layer, the first cement paste can be treated (partially) and after applying the second cement paste as a second discrete layer, the second diskered layer can be treated (partially). However, it is also conceivable that the entire layer system is treated after application of the cement masses.

In the context of the present invention, a layer system can be understood as meaning a layer composite of layers stacked on one another. The layer system may have a functional boundary layer between at least two of the discrete layers. The functional boundary layer can be formed, for example, at the common interface of second discrete layers. The functional boundary layer forms a kind of reaction zone, which has local differences in microstructure, chemical composition and chemical properties compared to the two discrete layers.

In the context of the present invention, an encapsulation compound can be understood as any type of encapsulation (packaging).

Characterized in that the Umhüllmasse not only from a contiguous cement composition, but rather consists of a layer system comprising a plurality of discrete layers, each with a cement mass, on the one hand, a much better adhesion of Umhüllmasse be achieved on the electrical component. The reason for this is that adapted to the material pairing, the cement composition can be optimized with regard to its adhesion properties and the layer structure can be selectively combined for the material pairings to form a layer system. That is, in other words, e.g. the thermal expansion coefficients of the layers can be adjusted so that possible thermal or mechanical mismatches between the electrical component and the entire encapsulant are prevented. On the other hand, the cross-layer propagation of cracks, which have formed in one of the discrete layers, can be inhibited efficiently, since the cracks only spread to the layer boundary or to the boundary layer where they are stopped or "buffered". Furthermore, the properties of the individual discrete layers and thus of the entire encapsulation compound can be adapted precisely to the requirements, the advantageous properties of the cement always being maintained in all discrete layers. Thus, for example, a portion of the layers may perform an additional function, e.g. a chemical function as a passivation or sacrificial layer, to provide protection against the liquid cement paste and possible external environmental effects, e.g. Moisture, dust, etc. provide and thus protect the electrical component and the metal from aggressive attacks. As a result, an electrical device with improved mechanical and anti-crack properties and longer life can be provided.

It is also advantageous if at least two of the discrete layers are partially disposed on the electrical component. That is, in other words, at least two of the discrete layers are arranged and / or formed such that they both contact the electrical component. By this measure, defined heat paths can be generated, for example, if the two cement compositions of the discrete layers have different thermal conductivities, so that a targeted and thus faster heat dissipation to the environment can be achieved.

Furthermore, it is advantageous if the layer system has a gradient in the thickness direction of the layer system. It is advantageous if the gradient is a gradient of the chemical and / or physical properties of the cement masses. Accordingly, the discrete layers may, for example, have a gradient with regard to their chemical and / or structural composition. The gradient is preferably formed stepwise with respect to the discrete layers of the layer system. That is, in other words, that the gradient does not exist within the discrete layers, but rather exists from one discrete layer to the next discrete layer. Accordingly, the individual discrete layers can each be formed homogeneously with respect to their chemical and / or physical properties. The gradient can be formed on the basis of the composition and / or the method of application and / or the treatment of the cement masses. The gradient may be a positive or negative gradient. The gradient may preferably decrease starting from the electrical component to the outside.

The gradient may preferably be selected from the group consisting of: porosity gradient, in particular gradient of the pore size and / or the number of pores, density gradient, layer thickness gradient, gradient of the degree of hydration, gradient of the composition, concentration gradient of a cement agent, concentration gradient of a reactive chemical function of the cement, concentration gradient of one Filler, particle size gradient of a filler. Here is a variety of other Gradieten conceivable without departing from the scope of the invention.

The cement compositions of the different discrete layers may have a similar chemical composition. The difference of the discrete layers may consist, for example, only in the concentration of a cement active and / or a reactive chemical function of the cement and / or a filler. The difference of the discrete layers can also exist in the degree of hydration. The porosity or degree of porosity - eg. the number of pores or pore size - the discrete layers can be adjusted or varied, for example, by changing the filler concentration and / or particle size of the filler. By increasing the porosity, weight reduction and improved crack inhibition can be achieved. The latter is due to the fact that the cracks diverted due to the pores and thus can spread worse within the discrete layers and also across layers. Furthermore, as the porosity increases, so does the inhibitory surface area for the reactions, which on the one hand further improves adhesion properties. On the other hand, the heat exchange decreases, whereby the insulation properties in turn can be varied or increased with increasing porosity. In addition, porosity can also increase the mechanical properties, i. the hardness or flexibility of the discrete layers and thus the Umhüllmasse be adjusted. Furthermore, the pores can also be filled, thus providing an additional function.

The density of the discrete layers can be adjusted or varied, for example, by changing the concentration of the filler while maintaining the degree of porosity. As a result, the thermal conductivity of the cement paste can be varied. Selective directional discrete layer construction allows directional heat dissipation.

Hydration gradient is a gradient of the degree of hydration to understand. The hydration can be adjusted, for example, by varying the cement content and the water content. The degree of hydration indicates the percentage by which the cement present in the cement paste has been converted into cement gel by hydration and thus has a strength-forming effect. Accordingly, the hydration gradient or the gradient of the degree of hydration can likewise be used to adjust the mechanical properties of the discrete layers. In addition, this can also be a kind of water buffer integrated or provided.

Due to the layer thickness gradient, mechanical stresses at the interfaces can be reduced. That is, in other words, e.g. the coefficient of thermal expansion of the cement layer could be adjusted according to the material pairing and thus a reduction of the mechanical stresses could be achieved.

It is furthermore advantageous if the filler comprises a material or consists of a material which is selected from the group consisting of: organic material, in particular polymer, inorganic material, in particular ceramic material (for example Al 2 O 3, ZrO 2), glass and metallic material.

• – Wärmebehandlung der Zementmassen;
• – Aussetzen der Zementmassen in einer definierten Gasatmosphäre;
• – Beaufschlagung der Zementmassen mit einem definierten Druck;
• – Beaufschlagung der Zementmassen mit elektromagnetischer Strahlung einer definierten Wellenlänge und Intensität, bspw. UV-Strahlung, Infrarot-Strahlung, sichtbarem Licht.

It is also advantageous if the step of treating the cementitious masses of the discrete layers comprises at least one of the following treatments:

• - heat treatment of the cement masses;
• - exposure of the cement masses in a defined gas atmosphere;
• - Applying to the cement masses with a defined pressure;
• - Acting on the cement compositions with electromagnetic radiation of a defined wavelength and intensity, for example. UV radiation, infrared radiation, visible light.

The heat treatment may comprise a tempering step in a tempering furnace. The heat treatment can be carried out in a temperature range of greater than or equal to 40 ° C to the same or equal to 95 ° C.

The gas atmosphere can be formed, for example, as an atmosphere or air with an increased air humidity of up to 100%. The gas atmosphere may also include catalyst or promoter molecules.

By this measure, for example, the additive can be activated efficiently and reliably to develop its functionality.

drawings

The invention will now be described by way of example with reference to the accompanying drawings. Show it:

1 a representation of an electrical device according to an embodiment of the present invention; and

2 a representation of an electrical device according to another embodiment of the present invention.

In 1 an electrical device according to the invention is shown, which in its entirety by the reference numeral 10 is provided.

The electrical device 10 has an electrical component 12 on. The electrical component 12 is as a semiconductor device 12 educated. The electrical component 12 is on a carrier substrate 14 arranged. Between the electrical component 12 and the carrier substrate 14 is a copper layer 16 arranged. The copper layer 16 in this case has several functions, namely to improve the heat connection and removal, an electrical contacting possibility for the electrical component 12 provide and possibly as flow stop the Umhüllmasse when applying.

The electrical component 12 is over bonding wires 18 with the opposite side of the carrier substrate 14 connected, whereby an electrical contact of the electrical component 12 is made possible from the outside. In this case, the carrier substrate 14 For example, be formed as a plate, in the further conductor tracks or electrical contacts for contacting the electrical component 12 can be integrated. The interconnects may also be on a surface of the carrier substrate 14 be arranged. The carrier substrate 14 may be formed into a chip.

The electrical device 10 also has an enveloping mass 20 with a layer system 22 on. The enveloping mass 20 and the shift system 22 are trained as Glob-Top. The enveloping mass 20 or the layer system 22 is on the carrier substrate 14 arranged. The shift system 22 envelops the electrical component 12 on the surfaces of the carrier substrate 14 are uncovered. Accordingly, the electrical component 12 completely through the carrier substrate 14 and the enveloping mass 20 envelops. The shift system 22 also covers a part of the carrier substrate 14 over which she is firmly attached to the carrier substrate 14 connected is.

The shift system 22 has a first discrete layer 24 , a second discrete layer 24 ' and a third discrete layer 24 '' on. The discreet layer 24 . 24 ' . 24 '' are stacked on each other and encase the electrical component 12 , The first discrete layer 24 is inside, ie adjacent to the electrical component 12 arranged. The second discrete layer 24 ' is central, ie between the first discrete layer 24 and the third discrete layer 24 '' arranged. The third discrete layer 24 '' is outside, ie adjacent to the environment of the electrical device 10 arranged.

According to the invention, the discrete layers 24 . 24 ' . 24 '' one cement paste each 26 . 26 ' . 26 '' on. Here, the first discrete layer 24 the first cement paste 26 on. The second discrete layer 24 ' has the second cement paste 26 ' on. The third discrete layer 24 '' indicates the third cement mass 26 '' on. In the exemplary embodiment shown, all discrete layers 24 . 24 ' . 24 '' one filler each 28 on. The filler 28 is particulate. The filler 28 is in each of the discrete layer 24 . 24 ' . 24 '' each substantially homogeneously distributed. Each of the discrete layers 24 . 24 ' . 24 '' has a substantially equal concentration of filler 28 on. The particle size of the filler 28 is within each of the discrete layers 24 . 24 ' . 24 '' mostly constant. The particle size of the filler 28 however, decreases from the inner first discrete layer 24 over the middle second discrete layer 24 ' to the outer discrete layer 24 '' to. Accordingly, the layer system 22 in his thickness direction 30 a gradient of the particle size of the filler 28 on. The thickness direction 30 corresponds to the thickness direction of the individual discrete layers 24 . 24 ' . 24 '' , That is, in other words, then the gradient of the particle size of the filler 28 not continuously from the first discrete layer 24 to the third discrete layer 24 '' but gradually from the first discrete layer 24 to the second discrete layer 24 ' and again gradually from the second discrete layer 24 ' to the third discrete layer 24 '' increases. Accordingly, it is possible according to the invention by a gradient of the particle size of the filler 28 the strength and the gap filling ability of Umhüllmasse 20 to vary.

The shift system 22 also has functional boundary layers 32 on. The functional boundary layers 32 are each between the discrete layers 24 . 24 ' . 24 '' arranged. The functional boundary layers 32 are designed as reaction zones. The functional boundary layers 32 were thus not applied separately but rather at the interfaces between the individual discrete layers 24 . 24 ' . 24 '' formed during the process. Accordingly, the functional boundary layers have 32 local differences in microstructure, chemical composition and chemical properties.

This allows a much better adhesion, in particular within the Umhüllmasse 20 be achieved. Furthermore, the propagation of cracks at the interfaces of the discrete layers 24 . 24 ' . 24 '' or at the functional boundary layers 32 be stopped efficiently.

In 2 is another electrical device according to the invention 10 ' shown. The electrical device 10 ' is analogous to the device 10 out 1 built up. The electrical device 10 ' However, on the one hand, a large number of electrical components 12 . 12 ' on. The electrical components 12 . 12 ' comprise a semiconductor device 12 and a sensor element 12 ' , The enveloping mass 20 ' or the layer system 22 ' enclose all electrical components 12 . 12 ' , On the other hand, the Umüllmasse 20 ' and the shift system 22 planar design.

The electrical device 10 ' according to the invention also has a gradient in the thickness direction 30 of the shift system 22 ' on. In contrast to the embodiment of 1 However, this is a hydration gradient or a gradient of the degree of hydration. As explained above, the degree of hydration indicates the percentage by which the cement present in the cement paste has been converted into cement gel by hydration and thus has a strength-forming effect. Here, the gradient and thus degree of hydration in the thickness direction decreases 30 of the shift system 22 ' outwards. The degree of hydration within each of the discrete layers 24 . 24 ' . 24 '' is again essentially the same. The degree of hydration only decreases from a discrete layer 24 . 24 ' to the next discrete layers 24 ' . 24 '' gradually. Thus, the first discrete layer 24 the highest degree of hydration and the third discrete layer 24 '' the lowest degree of hydration.

3 shows a further electrical device according to the invention 10 '' , The electrical device 10 '' is analogous to the device 10 ' out 2 constructed and thus also has a variety of electrical components 12 . 12 ' and a planar structure. In contrast to the embodiment of 2 has the layer system 22 '' additional paths 34 on. The paths 34 are parts of the discrete layers and extend from one relative to the electrical components 12 . 12 ' further outward discrete layer 24 ' . 24 '' through the interposed layer 24 or layers 24 . 24 ' up to one of the electrical components 12 . 12 ' , One of the paths 34 which part of the third discrete layer 24 '' is and also the cement paste 26 '' extends through the first discrete layer 24 and the second discrete layer 24 ' to the electrical component 12 , Accordingly, the electrical component 12 both from the first discrete layer 24 as well as from the third discrete layer 24 '' contacted. Another path 34 which part of the second discrete layer 24 ' is and also the cement paste 26 ' extends through the first discrete layer 24 to the electrical component 12 ' , Accordingly, the electrical component 12 ' both from the first discrete layer 24 as well as from the second discrete layer 24 '' contacted. The paths 34 In this case form heat paths, eg. By the fact that the two cement compounds 26 . 26 ' . 26 '' the discrete layers 24 . 24 ' . 24 '' each have different thermal conductivities, so that a targeted and thus faster heat dissipation to the environment can be achieved.

In the manufacture of the electrical device according to the invention 10 First, the cement masses 26 . 26 ' . 26 '' , For example, provided in powder form. In each of the cement masses 26 . 26 ' . 26 '' then becomes the filler 28 each mixed with different particle size, so that three cement masses 26 . 26 ' . 26 '' with substantially the same filler concentration but different particle size of filler 28 result. Subsequently, a liquid component, for example. Water with possibly the flux Melflux each in the cement masses 26 . 26 ' . 26 '' added. The first wet cement paste 26 with the smallest particle size is then evacuated to the electrical component 12 applied and as the first discrete layer 24 brought into shape, eg. By injection molding or casting in molds. Subsequently, the first cement paste 26 heat-treated or tempered, for example at 60 ° C and 90% relative humidity, whereby a complete or partial gelation, crystallization, needling and curing of the first discrete layer 24 he follows. This bows the humidity of a water loss (water-cement value) before and the temperature causes formation of the desired structures. Then the second wet cement measure 26 ' evacuated with the average particle size, on the first discrete layer 24 applied and as a second discrete layer 24 ' brought into shape, eg. By injection molding or casting in molds. Subsequently, the second cement paste 26 ' heat-treated or tempered, for example at 60 ° C and 90% relative humidity, whereby a complete or partial gelation, crystallization, needling and curing of the second discrete layer 24 ' he follows. This may form a functional boundary layer 32 between the first and second discrete layers 24 . 24 ' out. Then the third wet cement measure 26 '' with the largest particle size evacuated to the second discrete layer 24 ' applied and as a third discrete layer 24 '' brought into shape, eg. By injection molding or casting in molds. Subsequently, the third cement paste 26 '' heat-treated or tempered, for example at 60 ° C and 90% relative humidity, whereby a complete or partial gelation, crystallization, needling and curing of the third discrete layer 24 '' he follows. This may form a functional boundary layer 32 between the second and the third discrete layer 24 ' . 24 '' out. Finally, the Umhüllmasse 20 or the layer system 22 optionally treated, then demoulded and outsourced, for example at 300 ° C.

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 102013112267 A1 [0003]

Cited non-patent literature

• DIN EN 14647 [0009]

Claims (15)

Electrical device with an electrical component ( 12 . 12 ' ), which is a cement mass ( 26 ) comprising Umhüllmasse ( 20 ; 20 '; 20 '' ) is at least partially enveloped, characterized in that the Umhüllmasse ( 20 ; 20 '; 20 '' ) a layer system ( 22 ; 22 '; 22 '' ) of at least two discrete layers ( 24 . 24 ' . 24 '' ) each with a cement paste ( 26 . 26 ' . 26 '' ) having. Electric device ( 10 ) according to claim 1, characterized in that at least one of the cement masses ( 26 . 26 ' . 26 '' ) Comprises alumina cement or consists of alumina cement. Electric device ( 10 ) according to claim 1 or 2, characterized in that the layer system ( 22 ; 22 '; 22 '' ) at least one further discrete layer ( 24 . 24 ' . 24 '' ) each with a cement paste ( 26 . 26 ' . 26 '' ) having. Electric device ( 10 ) according to one of the preceding claims, characterized in that the layer system ( 22 ; 22 '; 22 '' ) between at least two of the discrete layers ( 24 . 24 ' . 24 '' ) a functional boundary layer ( 32 ) having. Electric device ( 10 ) according to one of the preceding claims, characterized in that at least two of the discrete layers ( 24 . 24 ' . 24 '' ) partially on the electrical component ( 12 . 12 ' ) are arranged. Electric device ( 10 ) according to one of the preceding claims, characterized in that the layer system ( 22 ; 22 '; 22 '' ) a gradient in the thickness direction ( 30 ) of the layer system ( 22 ; 22 '; 22 '' ) having. Electric device ( 10 ) according to claim 6, characterized in that the gradient is gradual with respect to the discrete layers ( 24 . 24 ' . 24 '' ) of the layer system ( 22 ; 22 '; 22 '' ) is trained. Electric device ( 10 ) according to claim 6 or 7, characterized in that the gradient is a gradient of the chemical and / or physical properties of the cement masses ( 26 . 26 ' . 26 '' ). Electric device ( 10 ) according to one of claims 6 to 8, characterized in that the gradient is selected from the group consisting of: porosity gradient, in particular gradient of the pore size and / or the number of pores, density gradient, layer thickness gradient, hydration gradient, gradient of the composition, concentration gradient of a cement active, concentration gradient a reactive chemical function of the cement, concentration gradient of a filler ( 28 ), Particle size gradient of a filler ( 28 ). Electric device ( 10 ) according to claim 9, characterized in that the filler ( 28 ) comprises a material or consists of a material which is selected from the group consisting of: organic material, in particular polymer, inorganic material, inorganic material, in particular ceramic material, glass and metallic material. Electric device ( 10 ) according to one of the preceding claims, characterized in that the electrical component ( 12 . 12 ' ) a semiconductor device ( 12 ), a sensor element ( 12 ' ), an inductance, a capacitance, a battery cell, a battery module or a circuit arrangement. Method for producing an electrical device ( 10 ) with an electrical component ( 12 . 12 ' ), which is a cement mass ( 26 ) comprising Umhüllmasse ( 20 ; 20 '; 20 '' ) is at least partially enveloped, in particular according to one of the preceding claims, with the following steps: providing at least one first and one second cement compound ( 26 . 26 ' . 26 '' ); - application of the first cement paste ( 26 ) as the first discrete layer ( 24 ) on the electrical component ( 12 . 12 ' ); Application of the second cement paste ( 26 ' ) as a second discrete layer ( 24 ' ) on the first discrete layer ( 24 ) to a shift system ( 22 ; 22 '; 22 '' ) of the enveloping mass ( 20 ; 20 '; 20 '' ) to build; and - treating at least one of the cement masses ( 26 . 26 ' ) of the discrete layers ( 24 . 24 ' ). A method according to claim 12, characterized in that the step of treating the cement masses ( 26 . 26 ' . 26 '' ) of the discrete layers ( 24 . 24 ' . 24 '' ) comprises at least one of the following treatments: - heat treatment of the cement masses ( 26 . 26 ' . 26 '' ); - exposure of the cement masses ( 26 . 26 ' . 26 '' ) in a defined gas atmosphere; - loading the cement masses ( 26 . 26 ' . 26 '' ) with a defined pressure; - loading the cement masses ( 26 . 26 ' . 26 '' ) with electromagnetic radiation. Process according to claim 12 or 13, characterized in that the cement compositions ( 26 . 26 ' . 26 '' ) are each formed and / or applied and / or treated in such a way that in the layer system ( 22 ; 22 '; 22 '' ) a gradual gradient with respect to the discrete layers ( 24 . 24 ' . 24 '' ) of the layer system ( 22 ; 22 '; 22 '' ) is formed. Use of a layer system ( 22 ; 22 '; 22 '' ) as encasing compound ( 20 ; 20 '; 20 '' ) for an electrical component ( 12 . 12 ' ) an electrical device ( 10 ), in particular according to one of claims 1 to 11 or produced according to one of claims 12 to 14, wherein the layer system ( 22 ; 22 '; 22 '' ) at least two discrete layers ( 24 . 24 ' . 24 '' ) each with a cement paste ( 26 . 26 ' . 26 '' ) having.

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