Abstract: A cermet and/or ceramic multi-coloured article, and in particular a bezel (1) of a timepiece, produced by a method for compressing at least two materials (2, 3) of distinct colours, the article including a relief decoration (8) of a different colour from the rest of the article, the decoration (8) being produced by laser ablation on one of the materials (3) after compression of the two materials (2, 3).

Abstract: A polycrystalline ceramic solely formed based on alumina, on chromium oxide and on magnesium oxide, where the polycrystalline ceramic contains between 0.8% and 1.2% of chromium oxide by total weight of the polycrystalline ceramic and between 0.03% and 0.09% of magnesium oxide by total weight of the polycrystalline ceramic, making it possible to obtain a red ceramic with a toughness (Kc) at least equal to 2.8 MPa·m1/2.

Abstract: A polycrystalline ceramic solely formed based on alumina, on chromium oxide and on magnesium oxide, where the polycrystalline ceramic contains between 0.8% and 1.2% of chromium oxide by total weight of the polycrystalline ceramic and between 0.03% and 0.09% of magnesium oxide by total weight of the polycrystalline ceramic, making it possible to obtain a red ceramic with a toughness (Kc) at least equal to 2.8 MPa·m1/2.

Abstract: A process for the production of a grey zirconia-based article wherein a first mixture includes a zirconia powder forming the base constituent, 4% to 15% by weight of at least one stabilizer selected from among the group of oxides including yttrium oxide, magnesium oxide and calcium oxide alone or in combination, 0.1% to 1% by weight of a vanadium oxide powder (V2O5), 0.1% to 1% by weight of a chromium oxide powder (Cr2O3) and 0.1% to 1% by weight of a silicon oxide powder (SiO2); making a second mixture including the first mixture and a binder; making a granulated mixture by conducting a granulation of the second mixture; forming a blank by giving this second granulated mixture the shape of the desired article; sintering the blank in air for at least thirty minutes at a temperature in the range of between 1250° and 1550° C.

Abstract: The invention concerns a method for fabricating an orange, zirconia-based article, characterized in that it includes the series of steps consisting in creating a first mixture comprising a zirconia powder, 3 to 20% by weight of at least one stabilizer chosen from the group of oxides comprising yttrium oxide, magnesium oxide, and calcium oxide, alone or in combination, 0.1% to 5% by weight of at least one element intended to form a vitreous phase, and chosen from the group comprising silicon oxide, aluminum oxide, lithium oxide and yttrium oxide, alone or in combination, 1% to 6% by weight of a cerium oxide powder; creating a second mixture including said first mixture and a binder; creating a granulated mixture by granulating said second mixture; forming a green body by giving said second granulated mixture the shape of the desired article; air sintering for at least thirty minutes at a temperature comprised between 1,250 and 1,500° C.

Abstract: A process for the production of a grey zirconia-based article wherein a first mixture includes a zirconia powder forming the base constituent, 4% to 15% by weight of at least one stabiliser selected from among the group of oxides including yttrium oxide, magnesium oxide and calcium oxide alone or in combination, 0.1% to 1% by weight of a vanadium oxide powder (V2O5), 0.1% to 1% by weight of a chromium oxide powder (Cr2O3) and 0.1% to 1% by weight of a silicon oxide powder (SiO2); making a second mixture including the first mixture and a binder; making a granulated mixture by conducting a granulation of the second mixture; forming a blank by giving this second granulated mixture the shape of the desired article; sintering the blank in air for at least thirty minutes at a temperature in the range of between 1250° and 1550° C.

Abstract: The invention concerns a method for fabricating an orange, zirconia-based article, characterized in that it includes the series of steps consisting in creating a first mixture comprising a zirconia powder, 3 to 20% by weight of at least one stabilizer chosen from the group of oxides comprising yttrium oxide, magnesium oxide, and calcium oxide, alone or in combination, 0.1% to 5% by weight of at least one element intended to form a vitreous phase, and chosen from the group comprising silicon oxide, aluminium oxide, lithium oxide and yttrium oxide, alone or in combination, 1% to 6% by weight of a cerium oxide powder; creating a second mixture including said first mixture and a binder; creating a granulated mixture by granulating said second mixture; forming a green body by giving said second granulated mixture the shape of the desired article; air sintering for at least thirty minutes at a temperature comprised between 1,250 and 1,500° C.