Method of manufacturing a black zirconia-based article and black

Details Method of manufacturing a black zirconia-based article and black Method of manufacturing a black zirconia-based article and black

1995-04-17

1998-01-27

Speer, Timothy

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 64, 264 65, 264 67, C04B 3564

Patent

active

057119066

ABSTRACT:
The invention concerns a method of manufacturing a black zirconia-based article, characterized in that it includes successive steps consisting of: producing a first mixture comprising a zirconia powder, 3 to 70% by weight of a stabilizer selected from the group of oxides comprising yttrium oxide, magnesium oxide, cerium oxide and calcium oxide, 1% to 10% by weight of a pigment selected from the group formed on the one hand by a cobalt oxide and iron oxide powder and on the other hand, by a spinel CoFe.sub.2 O.sub.4 powder; producing a second mixture comprising said first mixture and a binder; producing a granulated mixture by granulating said second mixture; forming a rough model by giving said second granulated mixture the shape of the desired article; sintering in air for at least 30 minutes at a temperature less than 1,400.degree. C. when said pigment is a cobalt oxide and iron oxide powder and less than 1,600.degree. C. when the pigment is a spinel CoFe.sub.2 O.sub.4 powder; and polishing said sintering said rough model.

REFERENCES:
patent: 4656145 (1987-04-01), Soroi
patent: 4977114 (1990-12-01), Horinouchi
patent: 5059562 (1991-10-01), Gentsu
patent: 5118457 (1992-06-01), Gentsu

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