Glass Compositions with Tunable CTE for Laminate Structures
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Solution Overview
Problem
The microelectronics industry faces challenges in producing glass substrates with uniform property specifications, such as coefficient of thermal expansion (CTE) and Young's modulus, which vary across manufacturers and facilities, making it difficult to economically and efficiently mass-produce glass substrates compatible with different microelectronic carrier operations.
Innovation Solution
The development of glass compositions with a high Young's modulus and tunable CTE, achieved by adjusting the ratio of Al2O3 and B2O3 to modifiers like Na2O, K2O, and CaO, allowing for the creation of laminated glass articles with a glass core and cladding layers that can be tailored to specific CTE ranges, enhancing mechanical strength and compatibility with various microelectronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass compositions are used in laminated structures, then mechanical strength and durability are improved, but manufacturing precision and property uniformity become difficult to control
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the glass, specifically maintaining the ratio of Al2O3 and B2O3 to modifiers between 0.95:1 and 1.05:1. This compositional parameter control enables the glass to achieve both high mechanical strength and uniform properties across different batches and manufacturing facilities.
Solution Approach 2:
The patent uses composite materials by combining multiple glass layers with different compositions - a core layer with specific CTE properties and cladding layers with different CTE properties. This composite structure allows the overall laminate to achieve both high strength and manufacturing precision by balancing the properties of individual layers.
2Adaptability or versatility
If glass substrates are designed for specific CTE ranges, then compatibility with microelectronic devices is improved, but adaptability to different carrier requirements becomes limited
Solution Approach 1:
The patent applies universality by creating a glass composition system that can serve multiple functions through a single base recipe. By controlling the Al2O3-B2O3-to-modifier ratio within 0.95:1 to 1.05:1, the same compositional framework can produce glasses with different CTE values (8.0-10.0 ppm/°C for core, 3.5-5.5 ppm/°C for cladding) to match various microelectronic device requirements, eliminating the need for entirely different composition designs for each application.
3Strength
If high Young's modulus is achieved through composition adjustment, then stiffness and resistance to breakage are improved, but control over CTE properties becomes more difficult
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing a specific compositional relationship - maintaining the ratio of Al2O3 and B2O3 to modifiers between 0.95:1 and 1.05:1. This parameter control simultaneously achieves high Young's modulus (at least 79 GPa) and precise CTE control (8.0-10.0 ppm/°C for core layer, 3.5-5.5 ppm/°C for cladding layer), demonstrating that the two properties can be optimized together rather than traded off against each other.
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
The glass compositions provide high stiffness, reduced carrier breakage during processing, and improved durability, enabling the production of glass substrates that meet diverse microelectronic carrier requirements while maintaining melting and forming properties.
Implementation Method 1
the modifier converts boron in B2O3 from trigonal to tetrahedral configuration
Implementation Method 2
the glass composition has a coefficient of thermal expansion from 8.0 ppm/° C. to 10.0 ppm/° C.
Data Source
AI summary
A glass composition includes from about 50 mol. % to about 70 mol. % SiO2, from about 0.1 mol. % to about 10 mol. % Al2O3, from about 5 mol. % to about 25 mol. % B2O3, and from about 10 mol. % to about 30 mol. % of a modifier, wherein the modifier is at least one of Na2O, K2O and CaO.