C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/11
C03C 3/10 (1980.01) C03C 3/22 (1980.01)
Patent
CA 1055965
THERMALLY CRYSTALLIZABLE GLASSES POSSESSING PRECISION CONTROLLED CRYSTALLIZATION AND FLOW PROPERTIES AND PROCESS OF PRODUCING SAME ABSTRACT OF THE DISCLOSURE A thermally crystallizable glass of predominantly lead-zinc borate composition is disclosed which is composes 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 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 full crystallized glass particles are less than 325 U.S. Series Sieve screen size; blending the fully crystallized glass particles together with the uncrystallized class particles in a 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 s 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.
222078
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