Glass Ceramic Composition for Stable High-Frequency Dielectric Applications
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Solution Overview
Problem
Existing glass ceramic compositions for high-frequency applications face challenges in achieving stable insulation reliability and desired relative permittivity due to crystallization issues and oxygen defects, leading to decreased performance at high temperatures and voltages.
Innovation Solution
A glass ceramic composition containing MgAl2O4, BaO, RE2O3, TiO2, and MnO, with specific weight percentages of SiO2, B2O3, Al2O3, Li2O, and MgO, that minimizes crystallization and enhances wettability, allowing for stable sintering and adjustable relative permittivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If glass component and ceramic component react to deposit crystals during firing, then relative permittivity can be adjusted, but crystal quantity and glass component quantity become unstable, decreasing insulation reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the glass component by specifying precise weight percentages of SiO2 (13-30%), B2O3 (10-40%), MgO (5-60%), and other oxides. This parameter optimization prevents excessive crystallization while maintaining relative permittivity adjustability, thereby resolving the contradiction between adaptability and insulation reliability
Solution Approach 2:
The patent creates a composite material system combining optimized glass components with ceramic components (MgAl2O4, BaTiO3, etc.). The composite structure allows controlled interaction between glass and ceramic phases, enabling relative permittivity adjustment through composition design while maintaining stability of crystal and glass quantities during firing, thus improving insulation reliability
2Ease of manufacture
If glass composition is adjusted to allow firing at 1000°C or lower, then manufacturing cost is reduced, but crystallization stability decreases, affecting insulation reliability
Solution Approach 1:
The patent optimizes glass composition parameters including SiO2 (13-30%), B2O3 (10-40%), and MgO (5-60%) to achieve a eutectic composition that lowers the melting and softening points. This enables firing at 1000°C or lower while maintaining glass component stability and preventing excessive crystallization, thus resolving the contradiction between ease of manufacture and insulation reliability
Solution Approach 2:
The patent incorporates specific amounts of MnO (0.1-5%) and other stabilizing oxides in the glass composition before firing. These components act as cushioning agents that suppress unwanted crystallization reactions during low-temperature firing, ensuring glass component quantity stability and maintaining insulation reliability despite the reduced firing temperature
3Ease of manufacture
If MgO content in glass is increased to improve sintering, then wettability is enhanced, but excessive crystal deposition occurs, decreasing insulation reliability
Solution Approach 1:
The patent precisely controls the MgO content parameter in the glass composition within the range of 5-60%, and combines it with specific ratios of SiO2 and B2O3. This balanced composition provides sufficient wettability for improved sintering while preventing excessive MgO-driven crystal deposition, thereby resolving the contradiction between ease of manufacture and insulation reliability
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 composition achieves high insulation reliability, stable relative permittivity, and low temperature coefficient of capacitance, enabling the production of a wide range of dielectric materials with improved performance in high-frequency applications.
Implementation Method 1
The glass ceramic composition contains... MnO... The glass component and the ceramic component react to deposit crystals in the firing process, and it is thus difficult to stabilize the crystal quantity and the quantity of the glass component at the time of firing completed
Implementation Method 2
The glass component and the ceramic component react to deposit crystals in the firing process
Implementation Method 3
a glass ceramic composition which is able to be fired at a temperature of 1000° C. or lower
Data Source
AI summary
A glass ceramic composition that contains a first ceramic including at least one of MgAl2O4 and Mg2SiO4; a second ceramic including BaO, RE2O3 (RE is a rare-earth element), and TiO2; glass containing each of 44.0 to 69.0 weight % of RO (R is an alkaline-earth metal), 14.2 to 30.0 weight % of SiO2, 10.0 to 20.0 weight % of B2O3, 0.5 to 4.0 weight % of Al2O3, 0.3 to 7.5 weight % of Li2O, and 0.1 to 5.5 weight % of MgO; and MnO.