Glass Ceramic Composition for Stable Sintering
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Solution Overview
Problem
Existing glass ceramics for low-temperature fired substrates have high boron content, leading to unstable boron levels due to dissolution or evaporation, resulting in insufficient sintering, poor moisture resistance, and mismatched thermal expansion coefficients, making them unsuitable for electronic devices.
Innovation Solution
A glass ceramic composition with a SiO2/B2O3 weight ratio of 1.21 or higher, Al2O3/ZnO ratio between 0.8 and 1.3, and inclusion of TiO2, ZrO2, SnO2, and SrO, along with quartz aggregates, to achieve low boron content, low permittivity, and high thermal expansion, ensuring stable sintering and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high boron content glass composition is used, then dielectric loss is reduced, but boron content becomes unstable due to dissolution or evaporation
Solution Approach 1:
The patent changes the chemical composition parameters by adding specific amounts of Al2O3 (1-10 wt%) and ZnO (1-10 wt%) to the glass system, while controlling B2O3 content at 15-30 wt%. This parameter adjustment creates a more stable glass network that prevents boron dissolution and evaporation, maintaining both low dielectric loss and compositional stability.
Solution Approach 2:
The patent creates a composite glass system combining multiple oxides (SiO2, B2O3, Al2O3, ZnO) with specific weight ratios. The Al2O3-ZnO-B2O3 system forms a composite structure where Al2O3 provides network stability and ZnO acts as a modifier that stabilizes boron, preventing its dissolution and evaporation while maintaining low dielectric loss.
2Loss of energy
If high boron content glass composition is used, then dielectric loss is reduced, but sintering becomes insufficient due to low viscosity
Solution Approach 1:
The patent adjusts the glass composition parameters by adding Al2O3 (1-10 wt%) and ZnO (1-10 wt%) to modify the viscosity characteristics. This parameter change allows the glass to maintain appropriate viscosity during sintering, enabling complete densification and high-quality sintering while preserving the low dielectric loss properties of boron-containing glass.
3Stability of the object's composition
If glass with reduced boron content is used, then compositional stability is improved, but moisture resistance and plating solution resistance deteriorate
Solution Approach 1:
The patent creates a composite glass system where Al2O3 (1-10 wt%) and ZnO (1-10 wt%) work synergistically with B2O3 (15-30 wt%). Al2O3 provides chemical stability and resistance to moisture and plating solutions, while ZnO stabilizes the boron content. This composite structure maintains compositional stability and enhances reliability simultaneously.
4Reliability
If glass ceramic with low coefficient of thermal expansion is used, then dielectric properties are improved, but thermal expansion mismatch with substrate and other dielectrics occurs
Solution Approach 1:
The patent modifies the thermal expansion properties by adjusting the glass composition, specifically adding Al2O3 (1-10 wt%) and ZnO (1-10 wt%) to the B2O3 system. This parameter change increases the coefficient of thermal expansion from below 6 ppm/K to 6-15 ppm/K, improving compatibility with substrates and other dielectric materials while maintaining good dielectric properties.
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 solution provides a glass ceramic with low dielectric loss, reduced temperature-dependent permittivity, and high thermal expansion, enhancing the reliability and quality of electronic components by maintaining boron stability and improving resistance to moisture and plating solutions.
Implementation Method 1
a glass ceramic containing the glass composition for low temperature fired substrates containing an aggregate
Data Source
AI summary
A glass ceramic that contains a glass containing Si, B, Al, and Zn and aggregates. The glass has a SiO2 content of 20% by weight to 55% by weight, a B2O3 content of 15% by weight to 30% by weight, Al2O3, and ZnO, wherein a weight ratio of the SiO2 to the B2O3 (SiO2/B2O3) is 1.21 or higher, and a weight ratio of the Al2O3 to the ZnO (Al2O3/ZnO) is 0.8 to 1.3. A TiO2 content, a ZrO2 content, a SnO2 content, and a Sr0 content in the glass each are 0% by weight to 5% by weight. The aggregates include 20% by weight to 50% by weight of SiO2, 1% by weight to 10% by weight of TiO2, 3% by weight or less of ZrO2, and 1% by weight or less of ZnO each relative to the weight of the glass ceramic.