Glass Ceramic Composition for High Q Value Multilayer Components
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Solution Overview
Problem
The existing glass ceramic compositions used in multilayer ceramic electronic components have limitations in achieving high Q values, particularly with a Qf of approximately 5,000 GHz, which restricts their high-frequency performance.
Innovation Solution
A glass ceramic composition incorporating CaZrO3-based ceramics and Li2O—MgO—ZnO—B2O3—SiO2-based glass, with specific weight percentages of each component, along with optional BaZrO3, SrTiO3, and Mg2SiO4, to enhance sintering properties and Q values, while maintaining low-temperature sintering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Li2O—RO—B2O3—SiO2-based glass is added to (Ca, Sr) (Zr, Ti)O3—MnO—SiO2-based ceramic, then firing temperature can be reduced to 1,000°C or less and high Q value can be achieved, but Qf is limited to approximately 5,000 GHz
Solution Approach 1:
The patent changes the chemical composition parameters of the glass component by introducing ZnO as a new oxide component and adjusting the ratios of Li2O, MgO, B2O3, and SiO2. This parameter modification enables the glass ceramic to achieve Qf values exceeding 5,000 GHz while maintaining low-temperature sintering capability at 1,000°C or less
Solution Approach 2:
The patent creates a composite material system combining CaZrO3-based ceramic with Li2O—MgO—ZnO—B2O3—SiO2-based glass. The specific composite composition, where the glass occupies 1 to 12 percent by weight of the total composition, synergistically combines the high dielectric constant of the ceramic with the low melting point and high Q value characteristics of the modified glass, achieving both low-temperature sintering and superior high-frequency performance
2Temperature
If conventional glass ceramic composition is used, then sintering can be performed at low temperature, but conductive pattern resistance losses remain significant in high frequency region
Solution Approach 1:
The patent modifies the glass composition parameters by incorporating ZnO (5 to 20 percent by weight) and adjusting the Li2O content (3.5 to 15 percent by weight) and MgO content (20 to 50 percent by weight). These parameter changes enhance the glass's ability to form low-resistance conductive patterns while maintaining low-temperature sintering capability, thereby reducing conductive pattern resistance losses in the high-frequency region
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 proposed composition achieves superior high-frequency properties with improved Q values, reduced conductive pattern resistance losses, and enhanced temperature stability, leading to more reliable multilayer ceramic electronic components.
Implementation Method 1
firing can be performed at a temperature of 1,000° C. or less, and as the result of the firing, a glass ceramic sintered body having a high relative dielectric constant, stable dielectric constant temperature properties, and a high Q value can be obtained
Data Source
AI summary
A glass ceramic composition which is formed by firing into a sintered body having a relatively high relative dielectric constant and Q value is provided. It includes a CaZrO3-based ceramic and a Li2O—MgO—ZnO—B2O3—SiO2-based glass. The Li2O—MgO—ZnO—B2O3—SiO2-based glass is 1 to 12 percent by weight of the total composition, the content of Li2O is 3.5 to 15 percent by weight, the content of MgO is 20 to 50 percent by weight, the content of BaO is 0 to 25 percent by weight, the content of CaO is 0 to 10 percent by weight, the content of SrO is 0 to 25 percent by weight, the content of B2O3 is 16 to 29 percent by weight, the content of SiO2 is 11 to 35 percent by weight, the content of ZnO is 5 to 20 percent by weight, and the content of Al2O3 is 0 to 15 percent by weight. This glass ceramic composition is advantageously used for green glass ceramic layers to form a green laminate structure useful as a main component body of an LC filter or the like.