Transparent alumina microspheres

Details Transparent alumina microspheres Transparent alumina microspheres

1987-01-07

1989-06-06

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

106442, 106401, 350105, 404 14, 423600, 423625, 423628, 428141, 428329, 428402, 428457, 501127, 523172, C01F 702, F21D 722, B32B 903

Patent

active

048370690

ABSTRACT:
Procedure for making Al.sub.2 O.sub.3 spheroids, 600 micrometers in diameter or less, utilizes an AlOOH sol containing 0.25% weight percent MgO (in the form of Mg(NO.sub.3).sub.2 .multidot.6H.sub.2 O) and HNO.sub.3. The sol is dispersed into droplets in a particle forming fluid (e.g., 2-ethylhexanol) where gelling occurs. The gelled spheroids are collected, dried and pre-fired in air at temperatures less than 1,200.degree. C. for up to about 12 hours. The dried and prefired beads are fired in a 2-step process at temperatures of about 1,850-1,950.degree. C. in the following sequence:

REFERENCES:
patent: 2326634 (1943-08-01), Gebhard et al.
patent: 2354018 (1944-07-01), Heltzer et al.
patent: 2407680 (1946-09-01), Palmquist et al.
patent: 2631353 (1953-03-01), Robinson
patent: 2963378 (1960-12-01), Palmquist et al.
patent: 3026177 (1962-03-01), St. Pierre et al.
patent: 3026210 (1962-03-01), Coble
patent: 3625773 (1971-12-01), Charles et al.
patent: 3849351 (1974-11-01), Jorgensen
patent: 3905845 (1975-09-01), Kobayashi et al.
patent: 3944658 (1976-03-01), Yoldas
patent: 4025159 (1977-05-01), McGrath
patent: 4031177 (1977-06-01), Auriol et al.
patent: 4071594 (1978-01-01), Pearson et al.
patent: 4117192 (1978-09-01), Jorgensen
patent: 4125407 (1978-11-01), Ueno
patent: 4150317 (1979-04-01), Laska et al.
patent: 4166147 (1979-08-01), Lange et al.
patent: 4222978 (1980-09-01), Oda et al.
patent: 4248932 (1981-02-01), Tung et al.
patent: 4285732 (1981-08-01), Charles et al.
patent: 4309312 (1982-01-01), Takumi et al.
patent: 4314827 (1982-02-01), Leitheiser et al.
patent: 4318896 (1982-03-01), Schoonover
patent: 4349456 (1982-09-01), Sowman
patent: 4357427 (1982-11-01), Ho et al.
patent: 4367919 (1983-01-01), Tung et al.
patent: 4490432 (1984-12-01), Jordan
patent: 4542113 (1985-09-01), Meyer et al.
patent: 4543346 (1985-09-01), Matsui et al.
patent: 4564556 (1986-01-01), Lange
patent: 4574003 (1986-03-01), Gerk
Bates, C. H., et al., "A Simplified Process for Preparing Translucent Alumina Tubes From Boehmite Powder", Trans. J. Brit. Ceram. Soc., 70(4), pp. 128-130, 1971.

Affiliated with

Also associated with

Rating

Transparent alumina microspheres does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transparent alumina microspheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transparent alumina microspheres will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-39738