Process for manufacturing a hybrid timepiece component, wherein the following steps are comprised: comprising structuring at least one wafer (14) of a first micromachinable material so as to form at least one through-opening (15) within the wafer (14), said structured wafer (14) being intended to form a first part (4) of the hybrid timepiece; component and depositing a metal by electroforming, so that the metal extends through the through-opening (15) and over the two upper and lower faces of the wafer (14) as a single piece resulting from one and the same electroforming step, the electroformed metal being intended to form a second part (8) of the hybrid timepiece component.

A method for producing a thermocompensated and coloured coil spring including the steps of forming a first layer of silicon oxide on at least one face of the core and on at least one other face of the core, the first layer having a thickness equal to a fraction of the thickness required for achieving thermal compensation, removing the first layer from at least one face of the core, forming a second layer of silicon oxide on at least one face of the core and on at least one other face of the core, the second layer having a thickness equal to the remaining fraction of the thickness required for achieving thermal compensation which is lower than or equal to 1 μm for giving at least one face of the core a colour as a result of the interference effect.

A timepiece mainspring including, in the manufactured state, an eye and a portion formed of coils with an outer coil of radius R, the eye and the portion formed of coils being connected by a neck portion having substantially zero curvature, the timepiece mainspring wherein the neck portion has a length L.sub.C comprised between 1.5 and 10 times, and preferably between 2 and 8 times, the radius R. The mainspring having this specific geometry reduces the risk of premature breakage during use, typically for an application with a k factor lower than 10.

A substrate for forming timepiece components includes a first part based on photostructurable glass and at least a second part based on at least one second material. One surface of the first part is made integral with a surface of the second part so as to form a one-piece timepiece component.

The invention relates to a compacted and densified metal material having one or more phases formed of an agglomerate of grains, the cohesion of the material being provided by bridges formed between grains, said material having a relative density higher than or equal to 95% and preferably higher than or equal to 98%.

A method for producing a timepiece spring includes the following steps: producing a piece based on silicon, having the desired shape of the timepiece spring; thermally oxidising the piece; deoxidising the piece; annealing the piece in a reducing atmosphere; forming a silicon oxide layer on the piece.

A mainspring includes a spiral metal strip and a hooking area formed in an inner face of an inner end of the strip, the hooking area including at least one shaped portion and at least one cavity in the inner face of the inner end.

The invention concerns a timepiece component containing a high-entropy alloy, the high-entropy alloy containing between 4 and 13 main alloying elements forming a single solid solution, the high-entropy alloy having a concentration of each main alloying element comprised between 1 and 55 at. %.

The invention relates to a compacted and densified metal material having one or more phases formed of an agglomerate of grains, the cohesion of the material being provided by bridges formed between grains, said material having a relative density higher than or equal to 95% and preferably higher than or equal to 98%.

The invention concerns a timepiece component containing a high-entropy alloy, the high-entropy alloy containing between 4 and 13 main alloying elements forming a single solid solution, the high-entropy alloy having a concentration of each main alloying element comprised between 1 and 55 at. %.