Zirconia ceramics and a process for production thereof

Details Zirconia ceramics and a process for production thereof Zirconia ceramics and a process for production thereof

C - Chemistry, Metallurgy

04

B

261/27

C04B 35/48 (2006.01)

Patent

CA 1281340

ABSTRACT In the present invention, there is provided an easy sintering particulate starting material for use in producing zirconia ceramic, which material is coated with transition metal compound(s) on the surface thereof; by adding (a) fully stabilized zirconia powder, partially stabilized zirconia powder, or alumina containing partially stabilized zirconia powder, or (b) precursor to generate the zirconia powder through pyrolysis thereof, into a solution or dispersion of the transition metal compound(s) used as a sinter activator to form a suspension. The raw particulate material enables sintering at a lower temperature and suppression of grain growth in the ceramics, and therefore, can produce zirconia ceramics of high strength and high toughness even by firing at atmospheric pressure . In accordance with the present invention, a novel Y2O3 partially stabilized zirconia ceramic as well as a novel alumina containing partially stabilized zirconia ceramic can be produced by the above-mentioned method. The resultant Y2O3 partially stabilized zirconia ceramics have a Y2O3 content of from 1.3 mol.% to 2.0 mol.%, the content of the tetragonal phase being 65% or more, and is a high strength ceramic having a fracture toughness of more than 10 MN/m3/2, reaching 16 MN/m3/2. The resultant alumina containing partially stabilized zirconia ceramic has a novel composition containing transition metal ozide, and is a high strength ceramic having Vickers hardness of 1100 to 1600 Kg/mm2, and improved heat shock resistance. Particularly, when based on the above-mentioned Y2O3 partially stabilized zirconia, the fracture toughness will reach 18.5 MN/m3/2.

517384

Affiliated with

Also associated with

Rating

Zirconia ceramics and a process for production thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zirconia ceramics and a process for production thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zirconia ceramics and a process for production thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1281827