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AssigneeETA SA Manufacture Horlogere Suisse
InventorsSerge Nicoud, Sébastien Roder
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A method for manufacturing a horological mobile (10) including: depositing a first thin layer (11) with a first material including at least nickel, the periphery of which defines the contour of the geometry of the horological mobile (10); depositing an intermediate layer (12), with a second material including at least nickel and phosphorus, so as to cover a face of the first thin layer (11), the periphery of which corresponds to that of the geometric shape of the first thin layer (11); depositing a second thin layer (13) with the first material, so as to cover a face of the intermediate layer (12), the periphery of which corresponds to that of the geometric shape of the first thin layer (11), wherein the first and the second thin layer (11, 13) are poorer in phosphorus than the intermediate layer (12), or do not contain any phosphorus.
The method according to claim 1, wherein the intermediate layer (12) is superimposed on the first thin layer (11) and the second thin layer (13) is superimposed on the intermediate layer (12), respectively at at least one interface face (14) contiguous to at least one friction face (15) of the horological mobile (10) intended to be in contact with another horological component.
The method according to claim 1, wherein the second material consists only of nickel and of phosphorus.
The method according to claim 1, wherein the second material has a proportion by weight of phosphorus between 1% and 15%.
The method according to claim 1, wherein the first material includes only pure nickel, or only nickel and phosphorus.
The method according to claim 1, wherein the first material comprises a proportion by weight of phosphorus less than or equal to 9%.
The method according to claim 1, wherein the first material comprises boron.
The method according to claim 1, wherein the first material has a thickness between 0.2 micrometres and 10 micrometres.
The method according to claim 1, wherein a heat treatment is applied to an assembly formed by the first thin layer (11), by the intermediate layer (12) and the second thin layer (13), at a temperature between 100° C. and 500° C., for 1 to 8 hours.
The method according to claim 1, characterised in that it is applied to the manufacturing of an escapement mobile which is an escapement wheel or pallets.
The method according to claim 1, wherein the first thin layer (11), the intermediate layer (12) and the second thin layer (13) are deposited so that the horological mobile (10) formed includes, in the orientation and in the direction of growth of deposition of said layers, a gradient of concentration of phosphorus defined by a progressive increase through the first thin layer (11), a stable state through the intermediate layer (12) and a decrease through the second thin layer (13).
A horological mobile (10) manufactured by the implementation of a method according to claim 1, comprising an intermediate layer (12) interposed between a first thin layer (11) and a second thin layer (13), said thin layers (11, 13) being made from a first material including at least nickel, the intermediate layer (12) being made from a second material including at least nickel and phosphorus, the first and the second thin layer (11, 13) being poorer in phosphorus than the intermediate layer (12), or not containing any phosphorus.
Dependencies are inferred from the claim text.