Conductive material comprising an Me-DLC hard material coating
View Patent ↗The invention relates to a conductive material consisting of an alloy that contains copper, for use as a plug-in or clip connection. Said material comprises a cover layer that is deposited on at least some sections of the contact surface, said layer consisting at least of a support layer and an adhesive layer. The anti-friction layer has a carbon content greater or less than 40 and less than or equal to 70 atomic percent.
1. Conductive material of a cupriferous alloy for use in plug or clamp connectors, with a coating deposited at least one parts of its contact surface, said contact layer consisting of at least one bonding layer and one carbon-containing antifriction layer, with a support layer which is provided between the bonding layer and the antifriction layer, or that the bonding layer serves as the support layer characterized in that the antifriction layer has a carbon content greater than or equal to 40% with an atomic percentage smaller than or equal to 70 and that the bonding layer and/or the support layer contains small amounts of one or several of the following elements and/or their alloys: Ag, Au, Cu, Fe, Ir, Mo, Ni, Pd, Pt, Os, Rh, Ru, W and that the contact resistance is between 0.1 and 90 mΩ.
2. Conductive material as in claim 1 , characterized in that the antifriction layer is a hard-material layer containing diamond-like carbon.
3. Conductive material as in claim 1 , characterized in that the antifriction layer additionally contains at least one metal Me from among the elements of subgroup IV, V and VI of the periodic system of elements (i.e. Ti, Zr, Hf; V, Nb, Ta; Cr, Mo, W) and Si.
4. Conductive material as in claim 3 , characterized in that the antifriction layer contains a metal-carbide layer deposited thereon, and the metal-carbide layer has a free-carbon content that increases toward the surface.
5. Conductive material as in claim 4 , characterized in that the metal carbide is a carbide of the subgroup IV, V and VI of the periodic system of elements.
6. Conductive material as in claim 5 , characterized in that the support layer contains at least one metal Me from among the elements of the subgroup IV, V and VI of the periodic system of elements (i.e. Ti, Zr, Hf; V, Nb, Ta; Cr, Mo, W) and Al or Si.
7. Conductive material as in claim 5 , characterized in that the support layer additionally or exclusively comprises one or several hard-material compounds containing at least one metal Me and at least one nonmetal, said metal consisting of at least one of the elements of subgroup IV, V and VI of the periodic system of elements (i.e. Ti, Zr, Hf; V, Nb, Ta; Cr, Mo, W) and Al or Si and said nonmetal containing at least one of the elements C, N, B or O.
8. Conductive material as in claim 5 , characterized in that a transitional layer is provided between the support layer and the antifriction layer.
9. Conductive material as in claim 8 , characterized in that the transitional layer consists of at least one metal Me from among the elements of the subgroup IV, V and VI of the periodic system of elements (i.e. Ti, Zr, Hf; V, Nb, Ta; Cr, Mo, W) and Al or Si.
10. Conductive material as in claim 8 , characterized in that the transitional layer is a graded index layer whereby the C-content of the transitional layer increases in the direction of the antifriction layer.
11. Conductive material as in one of the claims 6 to 10 , characterized in that the thickness of the support layer is between 0.5 and 6 μm.
12. Conductive material as in claim 11 , characterized in that the thickness of the support layer is between 1 and 3 μm.
13. Conductive material as in claim 5 , characterized in that the metal carbide is a carbide of tantalum, molybdenum, chromium or tungsten carbide.
14. Conductive material as in claim 7 , characterized in that said nonmetal contains carbon.
15. Conductive material as in claim 1 , characterized in that the contact resistance is between 0.5 and 10 mΩ.
16. Conductive material as in claim 1 , characterized in that the cupriferous alloy consists of copper, bronze, brass or German silver.
17. Conductive material as in claim 1 , characterized in that the cupriferous alloy is pre-coated with an electroplated layer.
18. Conductive material as in claim 1 , characterized in that the cupriferous alloy is pre-coated with an electroplated layer consisting of a Cr, a Ni or a CrNi alloy.
19. Electrical contact component containing or consisting of a conductive material according to claim 1 .
20. Electrically conductive subassembly comprising at least one contact component according to claim 19 .
21. Electrically conductive strip or profile incorporating at least one contact component according to claim 20 .