Comadur Sa

Arnaud Actis-Datta

Damien Cartier

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 (VO), 0.1% to 1% by weight of a chromium oxide powder (CrO) and 0.1% to 1% by weight of a silicon oxide powder (SiO); 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&#xb0; and 1550&#xb0; C.

Process for the production of a zirconia-based, coloured, in particular grey, article and a zirconia-based coloured decorative article obtained using this process

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&#xb0; C. and annealing the desired article at a temperature comprised between 700&#xb0; C. and 1,350&#xb0; C. for a period comprised between 30 minutes and 20 hours in a reducing atmosphere, and polishing said sintered green body.

Method for fabricating a coloured, zirconia-based article; in particular an orange coloured article; and a coloured, zirconia-based article obtained according to the method

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Sion, Switzerland

Arnaud Actis-Datta