Non-oxide ceramic particles coated with zirconium oxide or hydro

Details Non-oxide ceramic particles coated with zirconium oxide or hydro Non-oxide ceramic particles coated with zirconium oxide or hydro

1991-07-05

1993-11-30

Bell, Mark L.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428404, 501 96, 501 97, 501102, 501103, C04B 3558

Patent

active

052664040

ABSTRACT:
A composition suitable for the production of ceramics is provided. The composition comprises a particulate material which is a nitride, carbide, carbonitride or boride of Ti, Zr, Al, Si or B having a coating on the particle comprising 5 to 75 wt % with respect to particulate material of an oxide or hydrous oxide of zirconium.
The composition can be used to produce a tough zirconia
on-oxide ceramic without the need to co-mill the ingredients.
A stabilising agent for the zirconia may also be present in the coating although the invention is designed to avoid the necessity for such agents.
Coating usually is effected by a wet treatment process in which the particles are dispersed in a solution of a hydrolysable zirconium salt and the oxide or hydrous oxide is coated on the particles by adjusting the pH of the dispersion.

REFERENCES:
patent: 4748138 (1988-05-01), Watanabe et al.
patent: 4851293 (1989-07-01), Egerton et al.
patent: 4951427 (1990-08-01), St. Pierre

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