Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1974-03-29
1976-03-30
Garvin, Patrick P.
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 397, 106 398, 106 47R, C03C 322, C03C 312
Patent
active
039472795
ABSTRACT:
A thermally crystallizable glass of predominantly lead-zinc borate composition is disclosed which is composed of a homogeneous admixture of finely comminuted particles of thermally crystallizable glass and essentially fully crystallized glass particles in a ratio of about 1-10, or more preferably 2-7, parts by weight of crystallized glass particles to one million parts by weight of uncrystallized glass particles and which, in its finely comminuted state, possesses an overall particle size distribution such that it is uniformly composed of particles which are essentially entirely of -100 U.S. Series Sieve screen size and such that between about 65-78 weight percent of such particles are of -325 U.S. Series Sieve screen size. The thermally crystallizable glass composition is produced by a process involving the steps of providing a quantity of uncrystallized chips of crystallizable glass having a thickness of about 20-25 mils, and a quantity of essentially fully crystallized glass having a particle size ranging between about -20 and +80 U.S. Series Sieve screen size; reducing the particle size of the uncrystallized glass and fully crystallized to a particle size range wherein essentially all of the uncrystallized glass and fully crystallized glass particles are less than 100 U.S. Series Sieve screen size and wherein between about 65-78 percent by weight of the uncrystallized glass and fully crystallized glass particles are less than 325 U.S. Series Sieve screen size; blending the fully crystallized glass particles together with the uncrystallized glass particles in aa ratio of between about 100-225 parts by weight of crystallized glass particles to one million parts by weight of uncrystallized glass particles to produce a uniform "master blend" of finely comminuted, crystallized and uncrystallized glass particles. The master blend is then used for blending with uncrystallized particles of thermally crystallizable glass having a composition similar to that of the master blend and having a particle size such that essentially all of the uncrystallized particles are of -100 U.S. Series Sieve screen size and such that between about 65-78 percent by weight are of -325 U.S. Series Sieve screen size; the ratio of master blend to uncrystallized glass particles being selected to produce a homogeneous resulting blend or "product blend" composed of from about 1-10, or more preferably 2-7, parts of fully crystallized glass particles to each one million parts of uncrystallized glass particles.
REFERENCES:
patent: 2483647 (1949-10-01), Kjillgren
patent: 2889952 (1959-06-01), Claypoole
patent: 3061664 (1962-10-01), Kegg
patent: 3250631 (1966-05-01), Lusher
patent: 3291586 (1966-12-01), Chapman, Jr. et al.
patent: 3462252 (1969-08-01), Veres
patent: 3951167 (1960-08-01), Kegg et al.
McMillan, P. W., Glass Ceramics, Academic Press, London and N.Y., 1964, pp. 32-34, 38-43.
Hing, W., "Vitroceram," Silikat Tech. 10, 119-122 (1959).
Money, G. W., Properties of Glass, Second Edition, Waverly Press Inc., Baltimore, Md., 1954, p. 29.
Forbes, W. A., "Solder Glass Seals in Semiconductor Packaging," Glass Tech., Vol. 8, No. 2, Apr. 1967.
Rindone, G. E., Influence of Platinum Nucleaction on Crystallization of a Lithium Silicate Glass, Jacs, Jan. 1956, pp. 41-42.
Bell Mark
Dence Richard B.
Garvin Patrick P.
Holler E. J.
Owens--Illinois, Inc.
LandOfFree
Thermally crystallizable glasses possessing precision controlled does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermally crystallizable glasses possessing precision controlled, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermally crystallizable glasses possessing precision controlled will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-519109