Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1990-12-20
1993-02-02
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
501104, 501105, 501127, 501153, C04B 3510
Patent
active
051836106
ABSTRACT:
A method for producing a ceramic is disclosed. The method involves comminuting a batch composed of from 6 to 95 percent of particulate ZrO.sub.2 and from 5 to 94 percent of particulate Al.sub.2 O.sub.3. A part of the particulate ZrO.sub.2 is in a metastable tetragonal crystal structure, for example, as a consequence of 3.sup.m/o of Y.sub.2 O.sub.3 dissolved therein and a part has a monoclinic crystal structure. The comminuted batch is compacted into a shape, and the shape is fired. The degree of comminution of the batch, the firing conditions and the proportions of stabilized and monoclinic ZrO.sub.2 in the batch are controlled to produce a dense, gas impervious ceramic which contains both metastable tatragonal and monoclinic ZrO.sub.2, and in such proportions that the ceramic has improved strength by comparison with an otherwise identical ceramic wherein all of the ZrO.sub.2 is in either a metastable tetragonal or a monoclinic crystal structure.
Also disclosed is a method where the particulate alumina can be an alumina-chromia solid solution containing up to 50.sup.m/o of chromia.
In another embodiment, a ceramic article is disclosed. The article is composed of from 6 to 95 percent of particulate ZrO.sub.2, from 5 to 94 percent of particulate Al.sub.2 O.sub.3, from 1/4 to 33/4 percent of MnO.sub.2 and from 1/4 to 33/4 percent of TiO.sub.2 .
REFERENCES:
patent: 3686007 (1972-08-01), Gion
patent: 3916585 (1975-11-01), Barks
patent: 4298385 (1981-11-01), Claussen et al.
patent: 4533647 (1985-08-01), Tien
patent: 4552852 (1985-11-01), Manning
patent: 4587225 (1986-05-01), Tsukuma et al.
patent: 4659680 (1987-04-01), Guile
patent: 4666467 (1987-05-01), Matsumoto et al.
patent: 4772576 (1988-09-01), Kimura
patent: 4804645 (1989-02-01), Ekstrom
Journal of the American Ceramic Society, vol. 40, No. 4, Apr. 1957, p. 134 et seq.
Brog Terrence K.
Manning William R.
Cooper Indusries, Inc.
Derrington James
Purdue David C.
Purdue John C.
LandOfFree
Alumina-zirconia ceramic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alumina-zirconia ceramic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alumina-zirconia ceramic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-5827