Patent · US Active

Method for producing a lithium silicate glass blank and a lithium silicate glass-ceramic blank

US9701572B2 · kind B2 · utility

0Cited by

3References

29Claims

0Family size

Assignee

Dentsply International Inc. · US

Inventors

Markus Vollmann · Gelnhausen, DE
Udo Schusser · Alzenau, DE

Key dates

Filing date	Mar 27, 2015
Grant date	Jul 11, 2017
Priority date	—
Expiry date	Mar 27, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C10/0027
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention relates to a method for producing a blank of lithium silicate glass a starting composition of at least 8 wt-% of a stabilizer selected from the group consisting of ZrO2, HfO2, and mixtures thereof, wherein the method includes the steps of mixing the raw materials comprising the stabilizer in powder form, wherein the powder of the stabilizer has a particle size d50=x with 0.3 μm≦x≦1.5 μm, melting the raw materials in a crucible at a temperature TAU and storing the melt in the crucible for a time tH, pouring the homogenized melt into molds, wherein the melt flows out of the crucible with a discharge temperature TAB being TAU≧TAB, wherein the filling of the molds and the molding of the melt in the molds takes place with a cooling rate A.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.