1. A phase-change memory cell, comprising:
between two electrical contacts, a portion in a memory material with an amorphous-crystalline phase-change and vice versa, as a stack with an active central area located between two passive outmost areas; and
an interface between the active central area and each passive outmost area, each passive outmost area being made in a material having a melting temperature higher than that of the material of the active central area, the material of the passive outmost areas having very low solubility or zero solubility in the material of the active central area, the material of the passive outmost areas being a chalcogenide having the same chemical nature with a different composition of those of the material of the active area, the interface being inert or quasi-inert from a physico-chemical point of view even during a writing operation of the phase-change memory cell,
wherein the material of the active central area includes between about 16% and 30% of tellurium and between about 70% and 84% of antimony, the material of each passive outmost area being antimony or antimony mixed with tellurium with a percentage ranging up to about 2%, these percentages being atomic percentages.
2. The phase-change memory cell according to claim 1, wherein each passive outmost area is made in a material having a thermal conductivity less than or equal to that of the material of the electrical contact which is closest to it.
3. The phase-change memory cell according to claim 1, wherein the passive outmost areas have, in a crystalline phase, an electrical resistance less than or equal to that of the active central area in a crystalline phase.
4. The phase-change memory cell according to claim 1, wherein each passive outmost area is made in a material promoting a phenomenon of formation of crystalline germs in the active central area in proximity to the interface.
5. The phase-change memory cell according to claim 1, further comprising an electrically insulating material, wherein the active central area is at least partially confined laterally by the electrically insulating material.
6. The phase-change memory cell according to claim 1, wherein at least one of the passive outmost areas laterally overlaps the active central area.
7. The phase-change memory cell according to claim 1, wherein at least one of the passive outmost areas and the active central area coincide laterally.
8. The phase-change memory cell according to claim 1, further comprising an electrically insulating material, wherein at least one of the passive outmost areas is bordered with the electrically insulating material.
9. The phase-change memory cell according to claim 1, wherein each passive outmost area is made in a material having a thermal conductivity less than or equal to that of the material of the active central area.
10. The phase-change memory cell according to claim 1, wherein
each interface is directly between the active central area and one of the two passive outmost areas; and
the material of the active central area has undergone a phase change.
11. A memory including a plurality of memory cells according to claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-19. (canceled)
20. A wear protection coating, in particular an erosion protection coating for gas turbine components, which is applied to a to-be-protected surface of a flow mechanically stressed component, comprising an at least double-layer structure, wherein a first layer is applied to the to-be-protected surface of the component and has a material composition that is adapted to a material composition of the component, and wherein a second layer forms an outer cover coat.
21. The wear protection coating according to claim 20, wherein the first layer of the wear protection coating is comprised of a same or a similar material as the component.
22. The wear protection coating according to claim 20, wherein the first layer is porous and relatively soft.
23. The wear protection coating according to claim 20, wherein the first layer has damping properties.
24. The wear protection coating according to claim 20, wherein the first layer is applied directly to the to-be-protected surface of the component.
25. The wear protection coating according to claim 20, wherein the component is comprised of a titanium alloy and the first layer is comprised of a porous titanium alloy and wherein the component is a blade of a gas turbine.
26. The wear protection coating according to claim 20, wherein the component is comprised of a titanium-aluminum material and the first layer is comprised of a porous titanium-aluminum material.
27. The wear protection coating according to claim 20, wherein the second layer of the wear protection coating is relatively hard.
28. The wear protection coating according to claim 20, wherein the second layer is applied directly to the first layer.
29. The wear protection coating according to claim 20, wherein the second layer is comprised of a titanium-nitride material, an aluminum-nitride material or a titanium-aluminum-nitride material.
30. A component, in particular a gas turbine component, with a wear protection coating, in particular with an erosion protection coating, which is applied to a to-be-protected surface of a flow mechanically stressed component, wherein the wear protection coating has an at least double-layer structure, wherein a first layer is applied to the to-be-protected surface of the component and has a material composition that is adapted to a material composition of the component, and wherein a second layer forms an outer cover coat.
31. A method to manufacture a wear protection coating, in particular an erosion protection coating for gas turbine components, which is applied to a to-be-protected surface of a flow mechanically stressed component, comprising the steps of:
a) making available the component comprised of a component material composition; and
b) applying the wear protection coating to the to-be-protected surface of the component, wherein the wear protection coating has an at least double-layer structure, wherein a first layer is applied to the to-be-protected surface of the component and has a material composition that is adapted to a material composition of the component, and wherein a second layer forms an outer cover coat.
32. The method according to claim 31, wherein the first layer is applied directly to the to-be-protected surface of the component as a porous layer.
33. The method according to claim 31, wherein additives are incorporated into a material of the first layer and wherein the additives are vaporized thereby leaving behind pores within the first layer.
34. The method according to claim 31, wherein the first layer of the wear protection coating is applied by daubing, dipping or spraying as a slip material and is then hardened preferably by stove-enameling or aluminizing.
35. The method according to claim 31, wherein the first layer of the wear protection coating is applied with aid of a targeted matter vapor beam, in particular a PVD (Physical Vapor Deposition) matter beam.
36. The method according to claim 31, wherein the second layer is produced by evaporation coating or by nitration or by oxidizing or by aluminizing.
37. The method according to claim 36, wherein the second layer is applied directly to the first layer.
38. A gas turbine component, comprising:
a surface; and
a wear protection coating applied to the surface, wherein the wear protection coating includes a first layer in contact with the surface and having a material composition that is adapted to a material composition of the surface, and a second layer applied to the first layer that forms an outer cover coat on the component.
39. A method for wear protecting a component of a gas turbine, comprising the steps of:
applying a wear protection coating to a surface of the component, wherein the wear protection coating includes a first layer in contact with the surface and having a material composition that is adapted to a material composition of the surface, and a second layer applied to the first layer that forms an outer cover coat on the component.