Synthesis process for advanced ceramics

Details Synthesis process for advanced ceramics Synthesis process for advanced ceramics

1992-04-14

1996-04-09

Marcantoni, Paul

Compositions

Magnetic

Iron-oxygen compound containing

264 65, 264 66, 423593, 423594, 501 1, C04B 3526

Patent

active

055058655

ABSTRACT:
A process for synthesizing advanced ceramics having superior microstructures and properties. Metal oxide powder particles are produced from solutions of soluble salts of the respective metals by a spray decomposition process. The as-formed powders are heated in an inert atmosphere at a temperature below their sintering temperature and for a time sufficient to cause the oxide powder particles to densify without sintering, and the densified powder is then compacted under high pressure and finally sintered at a temperature above that employed in the initial heating step. Products of this process possess superior magnetic and structural uniformity, excellent grain structure, and very high mechanical strength relative to ceramics prepared without using a heat treatment for densification prior to the compacting step.

REFERENCES:
patent: 3274110 (1966-09-01), Getto
patent: 3428416 (1969-02-01), Gie et al.
patent: 3860524 (1975-01-01), Goldman
patent: 3948785 (1976-04-01), Berchtold
patent: 4059664 (1977-11-01), Nicolas et al.
patent: 4075391 (1978-02-01), Berg
patent: 4094061 (1978-06-01), Gupta et al.
patent: 4247500 (1981-01-01), Dixon et al.
patent: 4874598 (1989-10-01), Oda et al.
patent: 4960738 (1990-10-01), Hori et al.
"Alumina based ceramics and their preparation" Hayashi et al., (1988) Japan EP 284418 (Sep. 28, 1988) Chem. Abstract Answer #4 of 8.
"Fine Powders by Spray Pyrolysis Technique" Kato et al. (1977) Funtai Oyobi Funmatsuyakin 24(8) pp. 219-222--Chemical Abstract.
Introduction to the Principles of Ceramic Processing, James Reed pp. 38, 40, 44, 47-51 John Wiley & Sons (1988).
"Ba-Cu-O Superconducting Film by a Spray Pyrolysis Method" Kawai et al. (Published Sep. 18, 1987) pp. L1740-L1742.
Ceramic Processing Materials Advisory Board (1969) pp. 23-29. (See pp. 24-25).
Hawley's Condensed Chemical Dictionary 11th Edition (1987) Van Nostrand Reinhold Company (New York) pp. 220 and 636.
deLau, J. G. M., Ceramic Bulletin, "Preparation of Ceramic Powders from Sulfate Solutions by Spray Drying and Roasting," 49 No. 6:572-574 (1970).
K. Kumar and A. Petrovich, "Chemically Homogeneous Fine-Grained Mn-Zn Ferrites by Spray Decomposition" (Abstract), 4th Joint MMM-Intermag Conference, Vancouver, British Columbia, Canada, Jul. 12-15, 1988.
Della M. Roy et al, "Preparation of Fine Oxide Powders by Evaporative Decomposition of Solutions", Ceramic Bulletin, 56, pp. 1023-1024, 1977.
T. Pannaparayil, et al, "A novel low-temperature preparation of several ferrimagnetic spinels and their magnetic and Mossbauer characterization", J. Appl. Phys., 64, pp. 5641-5643, 1988.
Kumar, K.; Petrovic, A.; Williams, C. and VanderSande J. B., Chemically Homogeneous fine-grained Mn-Zn ferrites by spray drying.sup.a) ; J. Appl. Phys. 65(5), 1 Mar. 1989, pp. 2014-2016.

Affiliated with

Also associated with

Rating

Synthesis process for advanced ceramics does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-136627