Super-hard ceramics

Details Super-hard ceramics Super-hard ceramics

1990-08-21

1991-06-11

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C04B 3556, C04B 3510, C04B 3550

Patent

active

050232118

ABSTRACT:
A super-hard ceramic comprising 15-45% by weight of a mixture of titanium carbide and zirconium carbide at a ratio by weight of 1/0.05-1/0.40; 0.1-1.0% by weight of magnesium oxide; 0.05-0.5% by weight of lithium oxide; 0.2-1.0% by weight of neodymium oxide; and 52.5-84.65% by weight of alumina is disclosed. A process for preparing the super-hard ceramics is also disclosed. The super-hard ceramics of the present invention have high strength and high hardness as well as excellent toughness and resistance to chipping. Said ceramics can be used for cutting materials for which conventional alumina ceramics have been difficult to use, and are applicable to wear-resistant materials or electrical components which require high precision machining.

REFERENCES:
patent: 4251841 (1981-02-01), Jacobs
patent: 4416840 (1983-11-01), Lee et al.
patent: 4528121 (1985-07-01), Matsushita et al.
patent: 4543343 (1985-09-01), Iyori et al.
patent: 4650774 (1987-03-01), Kawaguchi et al.
patent: 4839315 (1989-06-01), Suzuki et al.

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