ALUMINIUM MATERIAL AND PROCESS FOR PRODUCING AN ALUMINIUM MATERIAL

Abstract

A metal matrix composite produced from a powder mixture including: a composition includes aluminium having a standard of purity of at least 95.0% and including hexagonal boron nitride, and up to 2% of the weight thereof of abherent, and up to 1% of the weight thereof of hexagonal boron nitride. A method for producing a metal matrix composite, which is produced from a powder mixture including: a composition including aluminium having a standard of purity of at least 95.0% and including hexagonal boron nitride, and up to 2% of the weight thereof of abherent, and up to 1% of the weight thereof of hexagonal boron nitride, includes comminuting the aluminium powder mechanically or by water atomisation or gas atomisation, and mixing the material components, in powder form, and processing the mixture, by primary shaping or extrusion or sintering or 3D printing, to form a bar, a semi-finished product, or a component.

Claims

1. A metal matrix composite produced from a powder mixture comprising: a composition comprising mechanically comminuted aluminium having a standard of purity of at least 95.0% and comprising hexagonal boron nitride, and up to 2% of the weight thereof of abherent, and up to 1% of the weight thereof of hexagonal boron nitride.

2. The material according to claim 1, wherein the composition does not comprise any other material component than the aluminium and the hexagonal boron nitride and the abherent.

3. The material according to claim 1, wherein the abherent is metal soap or stearic acid.

4. A method for producing a metal matrix composite produced from a powder mixture comprising: a composition comprising aluminium having a standard of purity of at least 95.0% and comprising hexagonal boron nitride, and up to 2% of the weight thereof of abherent, and up to 1% of the weight thereof of hexagonal boron nitride, the method comprising: comminuting the aluminium powder mechanically, and mixing the material components, in powder form, and processing the mixture, by primary shaping or extrusion or sintering or 3D printing, to form a bar, a semi-finished product, or a component.

5. The method according to claim 4, wherein primary shaping or extrusion or sintering or 3D printing is carried out such that the melting point of the aluminium material is not exceeded.

6. The method according to, claim 4, wherein the step of mixing the material components in powder form comprises: mechanically alloying the aluminium and the boron nitride, and deagglomerating previously and/or subsequently.

7. The method according to claim 6, wherein mechanically alloying the aluminium and the boron nitride, and deagglomerating previously and/or subsequently, take place in the same apparatus, in a grinder, in one work step.

8. The method according to claim 4, wherein mechanically comminuting the aluminium powder, and mixing the material components in powder form, take place in the same apparatus, in a grinder, in one work step.

9. The method according to claim 4, wherein the aluminium powder is mechanically comminuted to a grain size of at most 500 .Math.m or at most 100 .Math.m or at most 50 .Math.m.

10. The method according to claim 4, wherein the hexagonal boron nitride powder in the composition makes up at most 0.5% or at most 0.3% or at most 0.1% of the weight thereof, and/or has a purity of at least 95% or at least 97% or at least 98%, and/or has an average particle size of at most 50 .Math.m or 10 .Math.m or at most 5 .Math.m.

11. The method according to claim 4, wherein the abherent in the composition makes up at most 1.5% or at most 1.0% or at most 0.8% of the weight thereof.

Description

[0076] FIG. 1 is a stress/strain graph, and

[0077] FIG. 2 is a graph showing the thermal conductivity behaviour as a function of the temperature.

[0078] According to FIG. 1, the significantly higher stress curve of the aluminium composite according to the invention, having peak values for the tensile strength in the region of 350 MPa, compared with the known aluminium material (E-Al) having maximum values in the region of approximately 150 MPa, is clear.

[0079] FIG. 2 clearly shows the advantages of the aluminium composite according to the invention, because the thermal conductivity (W/mK), and accordingly the electrical conductivity, moves over the relevant temperature range, at the level of known aluminium materials (E-Al).