Impregnation method for transformation of transition alumina to

Compositions: ceramic – Ceramic compositions – Refractory

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

501153, C04B 3510

Patent

active

051399784

ABSTRACT:
The method of the present invention is useful in preparing an improved alpha alumina-based ceramic. The improvement consists of the addition of a precursor of an alpha phase nucleating to transition alumina. The method is particularly useful in preparing alpha alumina-based abrasive grain.

REFERENCES:
patent: B502773 (1976-01-01), Sowman
patent: 3108888 (1963-10-01), Bugosh
patent: 3491491 (1970-01-01), Ueltz
patent: 3491492 (1970-01-01), Ueltz
patent: 3615308 (1971-10-01), Amero
patent: 3717497 (1973-02-01), Stradley et al.
patent: 3734767 (1973-05-01), Church et al.
patent: 3808015 (1974-04-01), Seufert
patent: 3853688 (1974-12-01), d'Ambrosio
patent: 4007020 (1977-02-01), Church et al.
patent: 4019914 (1977-04-01), Esper et al.
patent: 4101615 (1978-07-01), Horikiri et al.
patent: 4125406 (1978-11-01), Sowman
patent: 4217113 (1980-08-01), Suh
patent: 4224099 (1980-09-01), McGill
patent: 4252544 (1981-12-01), Takahashi
patent: 4574003 (1986-03-01), Gerk
patent: 4615875 (1986-10-01), Gonczy et al.
patent: 4623364 (1986-11-01), Cottringer et al.
patent: 4657754 (1987-04-01), Bauer et al.
patent: 4744802 (1988-05-01), Schwabel
patent: 4770671 (1988-09-01), Monroe et al.
patent: 4797139 (1989-01-01), Bauer
patent: 4829031 (1989-05-01), Roy et al.
patent: 4881951 (1989-11-01), Wood et al.
patent: 4960441 (1990-10-01), Pellow et al.
patent: 4964883 (1990-10-01), Morris et al.
patent: 5009676 (1991-04-01), Rue et al.
patent: 5011508 (1991-04-01), Wald et al.
E. Ryshkewitch, Oxide Ceramic, Academic Press, New York, 1960, pp. 193-195.
"Nucleation and Epitaxial Growth in Diphasis (Crystalline & Amorphous) Gels", Roy et al., publication information unknown.
"A Novel Combustion Process for the Synthesis of Fine Particle .alpha.-Alumina and Related Oxide Materials", Mat. Lett., 6 (11,12), Jul. 1988, pp. 427-432.
"Enhanced Densification of Boehmite Sol-Gels by Alpha Alumina Seeding", Kumagai et al.,Communications of the American Ceramic Society, Nov., 1984, C-230-31.
"Microstructural Evolution in Sintering of ALOOH Gels", Yarbrough et al., J. Mater. Res., 3, (4), 1987, pp. 494-515.
"Enhancing densification of 93% Al.sub.2 O.sub.3 -7% MgO triphasic xerogels with crystalline .alpha.-Al.sub.2 O.sub.3 and MgAl.sub.2 O.sub.4 seeds", Komarneni et al., J. Mater. Sci. Lett., 6, 1987, pp. 525-527.
"Sapphire Whiskers from Boehmite Gel Seeded with .alpha.-Alumina", Jagota et al., J. Cryst. Growth, 85, 1987, pp. 527-534.
"Ceramics by the Solution-Sol-Gel Route", Roy, Science, 238, Dec. 18, 1987, pp. 1664-1669.
"Solid-Phase Epitaxy of Boehmite-Derived .alpha.-Alumina on Hematite Seed Crystals", McArdle et al., J. Am. Ceramic Soc., 72, (5), 1989, pp. 864-867.
"Nucleation of Alpha Alumina in Boehmite Gel", Pach et al., J. Mater. Res., 5, (2), Feb. 2, 1990, pp. 278-285.
"Effects of Metallic Oxides on .alpha.-Transformation of Alumina", Wakao et al., Nagoya Kogyo Gijutsu Shikeusho Hokoko II, 11, (9), Sep., 1962, pp. 588-595.
"Influence of Cr and Fe on Formation of .alpha.-Al.sub.2 O.sub.3 from .gamma.-Al.sub.2 O.sub.3 ", J. Am. Ceram. Soc., 57, (8), 1974, pp. 367-371, (Bye et al.).
"The Effect of Cr.sup.3+ and Fe.sup.3+ Ions on the Transformation of Different Aluminum Hydroxides to .alpha.-Al.sub.2 O.sub.3 ", Tsuchida et al., Thermochim. Acta., 64, 1983, pp. 337-353.
"Transformation and Microstructure Control in Boehmite-derived Alumina by Ferric Oxide Seeding", Adv. Cer. Matls., 3, (4), 1988, pp. 387-392 (McArdle et al.).
"Alpha Alumina Formation in Al.sub.2 O.sub.3 Gels", Dynys et al., Ultrastructure Processing of Ceramics, Glasses, and Composites, Ch. 11, Hench et al., ed., 1984.
"Lowering the Sintering Temperature and Enhancing Densification by Epitaxy in Structurally Diphasic Al.sub.2 O.sub.3 -MgO Xerogels", Suwa et al., Matl. Sci. Eng., 83, 1986, pp. 151-159.
"Controlled Transformation and Sintering of a Boehmite Sol-Gel by .alpha.-Alumina Seeding", Kumagai et al., J. Am. Ceram. Soc., 68, (9), 1985, pp. 500-505.
"Low-Temperature Sintering of Aluminum Oxide", Yeh et al., J. Am. Ceram. Soc., 71, (10), 1988, pp. 841-844.
"Controlled Chemical Nucleation of Alpha Alumina Transformation", Messing et al., Science of Ceramics 14, Taylor, ed., 1988, pp. 101-106.
"Lowering Crystallization Temperatures by Seeding in Structurally Diphasic Al.sub.2 O.sub.3 -MgO Xerogels", Suwa et al., J. Am. Ceram. Soc., 68, (9), 1985, pp. C238-240.
"Fine Particulates to Ultrafine-Grain Ceramics", Vasilos et al., Ultrafine-Grain Ceramics, Proc. of 15th Sagamore Army Mat. Res. Conf., Ch. 8, 1970, pp. 156-157.
"Study on Alumina as Raw Materials for Artificial Gems (Thermal Decomposition Process of Alums)", Okada et al., J. Ind. Chem., 59 (11), 1956, pp. 1301 (71)-04 (74).
"Effect of Sintering Atmosphere on Densification of MgO-Doped Al.sub.2 O.sub.3 ", Paek et al., J. Am. Ceram. Soc., 71, (8), 1988, pp. C-380-382.
"The Effect of Cr.sup.3+ and Fe.sup.3+ Ions on the Transformation of Different Aluminum Hydroxides to .alpha.-Al.sub.2 O.sub.3 ", Tscuchida et al., Thermochim. Acta., 64, 1983, pp. 337-353.
"Influence of Cr and Fe on Formation of .alpha.-Al.sub.2 O.sub.3 from .alpha.-Al.sub.2 O.sub.3 ", vol. 57, No. 8, 1974, pp. 367-371.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Impregnation method for transformation of transition alumina to does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Impregnation method for transformation of transition alumina to , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impregnation method for transformation of transition alumina to will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1248944

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.