The disclosure provides a metal surface layer treating method, a metal assembly and an electronic device. The metal surface layer treating method includes: putting metal into a vacuum chamber, and vacuumizing the vacuum chamber to a first vacuum degree; adding a mixed gas of acetylene, nitrogen and hydrogen into the vacuum chamber; and heating the vacuum chamber to a temperature above an ambient temperature. In response to the temperature in the vacuum chamber reaching a first temperature value above the ambient temperature and a gas pressure of the vacuum chamber reaching a first pressure value, performing glow discharge so that a carbon-nitrogen gradient hardening layer is formed on a surface layer of the metal. The method includes removing part of a carbon layer of the surface layer of the carbon-nitrogen gradient hardening layer.

A case including a case main body, a first exterior member which is arranged on an upper part of the case main body, and positioning members which are connected to the first exterior member, and positionally fix the first exterior member on the case main body, in which the first exterior member has connection portions provided in an undersurface thereof, and the positioning members have first positioning portions which are arranged in the connection portions, positionally fixed in the first exterior member, and positionally fixed on the case main body, and second positioning portions which are arranged and positionally fixed on the case main body.

A ceramic powder for a ceramic component, in particular based on zirconia and/or alumina, in particular for a timepiece or jewelry piece. The powder includes at least one noble metal among platinum, rhodium, osmium, palladium, ruthenium and iridium, at a quantity of less than or equal to 5% by weight.

A ceramic powder for a ceramic component, in particular based on zirconia and/or alumina, in particular for a timepiece or jewelry piece. The powder includes at least one noble metal among platinum, rhodium, osmium, palladium, ruthenium and iridium, at a quantity of less than or equal to 5% by weight.

A method for decorating a substrate which includes the succession of the following steps: provide the substrate; deposit a layer of a sacrificial material over a surface of the substrate; structure the sacrificial material layer so as to create in this sacrificial material layer a plurality of cavities to form a decorative or technical pattern; eliminate the sacrificial material layer except at the location where the pattern is provided.

An exterior member including an exterior main body having laminated first fiber resin sheets, and a protection member provided on an end surface constituted by layers of the first fiber resin sheets of the exterior main body.

An exterior member including an exterior main body having laminated first fiber resin sheets, and a protection member provided on an end surface constituted by layers of the first fiber resin sheets of the exterior main body.

A method for colouring a part to be treated made of metal, this method including the step of implanting mono- or multi-charged ions in a surface layer of the part to be treated by directing towards this part to be treated a mono- or multi-charged ion beam produced by a source of mono- or multi-charged ions, the part to be treated changing colour under the effect of this ion implantation. A coloured metal can be obtained with the above method.

Types of metal component parts including a casing, a bezel, a buckle, parts for a watch band, etc. are made with the Metal Injection Molding (MIM) process. Each type of metal component part can be derived from an instance of a MIM blank corresponding to that particular type of metal component part formed from its corresponding injection molding tool. The MIM blank formed for the metal component part from the injection molding tool then has a portion of the MIM blank subtracted through a laser subtraction process to form an interim shape and geometry of the instance of the metal component part. The laser subtraction process is applied to the instance of the MIM blank for the metal component part when the instance of the MIM blank has not yet been sintered and hardened to a finished shape and geometry for that metal component part for the watch design.

Types of metal component parts including a casing, a bezel, a buckle, parts for a watch band, etc. are made with the Metal Injection Molding (MIM) process. Each type of metal component part can be derived from an instance of a MIM blank corresponding to that particular type of metal component part formed from its corresponding injection molding tool. The MIM blank formed for the metal component part from the injection molding tool then has a portion of the MIM blank subtracted through a laser subtraction process to form an interim shape and geometry of the instance of the metal component part. The laser subtraction process is applied to the instance of the MIM blank for the metal component part when the instance of the MIM blank has not yet been sintered and hardened to a finished shape and geometry for that metal component part for the watch design.