Phase Separated Composite Glass Microstructure Control
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Solution Overview
Problem
Natural phase separation in glass manufacturing is complex and lacks control over microstructure size and morphology, making it difficult to achieve specific predetermined product characteristics, especially when certain phase sizes or morphologies are beyond the natural coarsening limit.
Innovation Solution
A method involving the analysis of precursor or template glasses to determine phase compositions, milling the glasses to specific cullet sizes, and combining them at temperatures below the isotherm tie-line of a pseudo-binary immiscibility dome, followed by quenching, to produce phase-separated composite glasses with microstructures outside natural constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If natural phase separation is used to produce glass materials, then the process is simple and cost-effective, but the microstructure size and morphology cannot be controlled to achieve predetermined product characteristics
Solution Approach 1:
The invention segments the phase separation process into two distinct stages: (1) natural phase separation to create a precursor glass with initial phase distribution, and (2) mechanical comminution to control the final microstructure size. This segmentation allows each stage to serve its specific function - the first stage creates phase separation while the second stage controls morphology, thereby resolving the contradiction between simplicity and precision.
Solution Approach 2:
The invention performs preliminary phase separation before the final product formation by creating a phase-separated precursor glass that is then mechanically processed. This preliminary action enables control over the final microstructure by decoupling the phase separation thermodynamics from the microstructure size control, allowing predetermined product characteristics to be achieved.
2Manufacturing precision
If natural phase separation is allowed to proceed to equilibrium, then thermodynamic stability is achieved, but the microstructure size exceeds the natural coarsening limit and cannot achieve desired fine structures
Solution Approach 1:
The invention performs phase separation as a preliminary action to create a precursor glass with the desired phase composition, then stops the coarsening process by mechanical comminution before equilibrium is reached. This allows control of microstructure size below the natural coarsening limit while maintaining phase composition stability.
Solution Approach 2:
The invention changes the controlling parameter for microstructure size from thermodynamic equilibrium conditions to mechanical processing parameters (comminution energy, time, and intensity). This parameter change enables precise control of microstructure size independent of the natural coarsening limit, resolving the contradiction between size precision and thermodynamic stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the production of glass articles with microstructures greater than the natural coarsening limit, providing greater control over microstructure size and stability, enabling the creation of materials that would otherwise be inaccessible through natural phase separation.
Implementation Method 1
Phase separation is a natural process that occurs in some glasses in the liquid phase, whereby the glass separates into two distinct phases resulting in a loss of homogeneity and modified physical and chemical properties
Implementation Method 2
The glass mixture is melted at a temperature from about 25° C. to 0° C. less than an isotherm tie-line between endpoints of a pseudo-binary immiscibility dome
Data Source
AI summary
A phase separated composite glass has a first phase and a second phase. The first phase has an average microstructure size greater than a natural coursing limit of the phase separated composite glass (i.e., outside of what would be achievable by natural phase separation or otherwise in violation of the morphology constraints defined by a liquid-liquid immiscibility dome for the given bulk composition). Methods of preparing a phase separated composite glass based on a phase separated precursor glass or a template glass. Methods include combining a milled first glass corresponding to the first phase and a milled second glass corresponding to the second phase to form a glass mixture. Methods include melting the glass mixture at a temperature from about 25° C. to 0° C. less than an isotherm tie-line between endpoints of a pseudo-binary immiscibility dome defined by the phase separated precursor glass or the template glass.