Method for manufacturing an ornamental hard material part provided with a polymer coating

Abstract

An ornamental part, for example for a timepiece, jewellery or telephone, in particular a watch case middle, and its manufacturing method, the part at least partly including a hard material having a Vickers hardness greater than 1000 HV, the method including the following main steps: a step of producing a precursor from a mixture of at least one powder material with a binder, a step of injecting the precursor into a mould in order to form a green body, a step of sintering the green body in order to form a body of the future part from the hard material, and a step of depositing a polymer material coating on one face of the part, the deposition being carried out by moulding on the body, in particular by injection into a mould, the coating and the hard material being inseparable.

1 . An ornamental part for a timepiece, jewellery or telephone, comprising a hard material body and at least one face provided a polymer material coating. 
     
     
         2 . The ornamental part according to  claim 1 , wherein the coating has a functionalised shape. 
     
     
         3 . The ornamental part according to  claim 1 , wherein the body defines an internal space, the face bordering said space. 
     
     
         4 . The ornamental part according to  claim 1 , further comprising a back obtained during the coating deposition step. 
     
     
         5 . A watch case comprising an ornamental part according to  claim 1 , as well as a crystal and a bezel for holding the glass on the part, the bezel being assembled to the part by the polymer coating.