METHODS AND APPARATUS FOR PREDICTING GLASS DYNAMICS

摘要

Computer-implemented methods and apparatus are provided for predicting/estimating (i) a non-equilibrium viscosity for at least one given time point in a given temperature profile for a given glass composition, (ii) at least one temperature profile that will provide a given non-equilibrium viscosity for a given glass composition, or (iii) at least one glass composition that will provide a given non-equilibrium viscosity for a given time point in a given temperature profile. The methods and apparatus can be used to predict/estimate stress relaxation in a glass article during forming as well as compaction, stress relaxation, and/or thermal sag or thermal creep of a glass article when the article is subjected to one or more post-forming thermal treatments.

主权项

1. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and (II) forming a glass article from the molten glass; wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components which become at least part of the glass article; and(B) the method is characterized by said viscosity-affecting components and/or their concentrations having been selected at least in part using computer-implemented modeling that predicted/estimated non-equilibrium viscosity of the molten glass using an equation where the non-equilibrium viscosity is a function of both equilibrium and non-equilibrium components, wherein the equilibrium and non-equilibrium components are each in turn functions of fictive temperature and composition, and wherein the equilibrium and non-equilibrium components are each non-zero.