LAYERED COMPOSITE

Abstract

Laminar structure comprising two outwardly facing metal layers with an interposed alternating layer sequence made up of n layers of a hydraulically cured inorganic cement composition and n1 metal layers, where n=1, 2, or 3.

Claims

1. A laminar structure comprising or consisting of two outwardly facing metal layers with an interposed alternating layer sequence made up of n layers of a hydraulically cured inorganic cement composition and n1 metal layers, where n=1, 2, or 3.

2. The laminar structure according to claim 1, wherein the layer thickness of the metal layers is in each case within the range of 100 to 1500 m.

3. The laminar structure according to claim 1, wherein the layer thickness of the metal layers, with the exception of the metal layer forming the underside, is in each case within the range of 100 to 1500 m, and wherein the layer thickness of the metal layer forming the underside is in the range of >1500 to 5000 m.

4. The laminar structure according to claim 1, having a surface measure in the range of 2 to 700 cm.sup.2.

5. The laminar structure according to claim 1, in a rectangular format.

6. The laminar structure according to claim 1, which either can be used directly as a substrate in the field of electronics or is designed as a large-area source for a plurality of small-area laminar structures which can be used directly as a substrate in the field of electronics.

7. The laminar structure according to claim 1, wherein the edges of the metal layers do not project beyond the edges of the layer or layers of hydraulically cured inorganic cement composition.

8. The laminar structure according to claim 1, wherein the metal layers are arranged congruently.

9. The laminar structure according to claim 1, wherein the metal layers consist of the same or different metals.

10. The laminar structure according to claim 1, wherein the metals of the metal layers are selected from the group consisting of copper, copper alloys, molybdenum, molybdenum alloys, aluminum, and aluminum alloys.

11. The laminar structure according to claim 1, wherein n=2 or 3 and the layers of hydraulically cured inorganic cement composition consist of hydraulically cured inorganic cement compositions that are the same or different from one another in each case.

12. The laminar structure according to claim 1, wherein the at least one hydraulically cured inorganic cement composition consists of a hydraulically cured inorganic cement or, in addition to the actual hydraulically cured inorganic cement, comprises one or more further constituents in a total proportion of 0.5 to 98 wt. %.

13. The laminar structure according to claim 12, wherein the hydraulically cured cement has been formed by hydraulic curing of a hydraulically curable inorganic cement selected from the group consisting of Portland cement, aluminous cement, magnesium oxide cement, and phosphate cement.

14. The laminar structure according to claim 1, wherein the further constituent or constituents is/are selected from the group consisting of fillers, fibers, flow improvers, setting retardants, defoamers, water-miscible organic solvents, hydrophobizing agents, additives which influence surface tension, wetting agents, and adhesion promoters.

15. A continuous or discontinuous method for producing a laminar structure according to claim 1, comprising the application of an aqueous hydraulically curable inorganic cement preparation in a homogeneous layer thickness in each case between metal foils, followed by hydraulic curing and drying of the applied aqueous hydraulically curable inorganic cement preparation.

16. The use of a laminar structure according to claim 1 or produced according to the application of an aqueous hydraulically curable inorganic cement preparation in a homogeneous layer thickness in each case between metal foils, followed by hydraulic curing and drying of the applied aqueous hydraulically curable inorganic cement preparation.

Description

EMBODIMENTS

[0051] Example 1: 7 parts by weight of an aluminous cement powder having a maximum particle size of 63 m (oversize material 5%), 6 parts by weight of 2-imidazolidinone, 10 parts by weight of microsilica having a maximum particle size of 5 m, 65 parts by weight of aluminum oxide powder having a maximum particle size of 100 m, and 12 parts by weight of water were mixed to form an aqueous cement preparation. The aqueous cement preparation was applied by means of a brush to one side of a 0.5 mm thick copper foil (format 5 cm by 3 cm) in a homogeneous layer thickness of 760 m. Subsequently, a second identical copper foil was placed congruently with the first copper foil on the side coated with the applied cement preparation and cured hydraulically at 20 C. for 4 hours. Subsequently, the sandwich arrangement provided in this way was heated at a heating rate of 1 K/min in an oven to 90 C. and held at this temperature for one hour. Thereafter, the temperature was increased to 160 C. at a heating rate of 1 K/min and held for one hour.

[0052] Example 2: 5 parts by weight of a magnesium oxide cement powder having a maximum particle size of 50 m, 6 parts by weight of 2-imidazolidinone, 11 parts by weight of microsilica having a maximum particle size of 5 m, 65 parts by weight of aluminum oxide powder having a maximum particle size of 100 m, and 12 parts by weight of water were mixed to form an aqueous cement preparation. The aqueous cement preparation was applied by means of a brush to one side of a 0.5 mm thick copper foil (format 5 cm by 3 cm) in a homogeneous layer thickness of 760 m. Subsequently, a second identical copper foil was placed congruently with the first copper foil on the side coated with the applied cement preparation and cured hydraulically at 20 C. for 4 hours. Subsequently, the sandwich arrangement provided in this way was heated at a heating rate of 1 K/min in an oven to 90 C. and held at this temperature for one hour. Thereafter, the temperature was increased to 160 C. at a heating rate of 1 K/min and held for one hour.