High-strength and temperature-stable formed bodies of zirconium

Details High-strength and temperature-stable formed bodies of zirconium High-strength and temperature-stable formed bodies of zirconium

1988-02-09

1990-02-13

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501103, 501104, 501105, C04B 3548

Patent

active

049004921

ABSTRACT:
The present invention provides a fine-grained ceramic formed body of 0.5 to mole % rare earth oxide and 0.5 to 7 mole % MgO-containing ZrO.sub.2, wherein the cubic granules thereof are coated with Mg-Al spinel particles.
The present invention also provides a process for the production of such formed bodies, wherein a ZrO.sub.2 powder alloyed with rare earth oxide, which contains small amounts of Al.sub.2 O.sub.3, is pressed and sintered in the presence of MgO at a temperature of from 1400.degree. to 1600.degree. C. and optionally subsequently tempered at a temperature of from 1200.degree. to 1350.degree. C.

REFERENCES:
patent: 3083123 (1963-03-01), Navias
patent: 4221650 (1980-09-01), Friese et al.
patent: 4382997 (1983-05-01), Henslee et al.
patent: 4525464 (1985-06-01), Claussen et al.
patent: 4626517 (1986-12-01), Watanabe et al.

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