Mg2SiO4 Dielectric Ceramic for Ag Electrode Co-Firing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing low temperature co-fired ceramic (LTCC) materials used in high-frequency electronic components, such as those in mobile communication devices, face challenges in achieving high Q values and humidity resistance while co-firing with Ag electrodes, especially with the trend towards thinner ceramic layers and higher frequency bands.
Innovation Solution
A dielectric ceramic composition comprising Mg2SiO4 as the main component, with R-containing, Cu-containing, B-containing, Li-containing glass, and optional Mn-, Ti-, Al-, and Zr-containing compounds, optimized in specific mass ratios, allows for low temperature sintering and improved Q values and humidity resistance, enabling co-firing with Ag electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ZnO is used as a sub-component for low temperature sintering, then sintering temperature can be reduced to 1000°C or lower, but Q value and humidity resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ZnO with a specific combination of R-containing compound (0.2-4.0 parts RO), Cu-containing compound (0.5-3.0 parts CuO), B-containing compound (0.2-3.0 parts B2O3), and Li-containing glass (2-10 parts). This parameter change enables low temperature sintering while maintaining excellent Q values and humidity resistance, resolving the contradiction between sintering temperature and material reliability.
Solution Approach 2:
The patent creates a composite material system combining Mg2SiO4 main component with multiple sub-components (R-containing compound, Cu-containing compound, B-containing compound, and Li-containing glass). This composite approach synergistically achieves low temperature sintering capability, high Q value, and excellent humidity resistance, overcoming the limitations of single-component systems like ZnO-based materials.
2Length of moving object
If ceramic layer thickness is reduced for component thinning, then component size is reduced, but maintaining Q value and humidity resistance becomes more difficult
Solution Approach 1:
The patent optimizes the composition parameters of the dielectric ceramic to achieve excellent Q values and humidity resistance even in thin ceramic layers. The specific composition ratios of R-containing compound, CuO, B2O3, and Li-containing glass create a material that maintains high reliability regardless of thickness reduction, enabling component miniaturization without sacrificing performance.
3Ease of manufacture
If co-firing with Ag internal electrode is performed, then integration is achieved, but Q value and humidity resistance require further improvement
Solution Approach 1:
The patent adjusts the chemical composition parameters to achieve optimal co-firing characteristics with Ag internal electrodes. The specific combination of R-containing compound (0.2-4.0 parts RO), CuO (0.5-3.0 parts), B2O3 (0.2-3.0 parts), and Li-containing glass (2-10 parts) creates a material that not only co-fires well with Ag but also achieves excellent Q values and humidity resistance, simultaneously improving both manufacturability and 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 excellent Q values and humidity resistance, maintaining bending strength and reducing dielectric loss, making it suitable for high-frequency applications in electronic components like filters, resonators, and capacitors.
Implementation Method 1
capable of low temperature sintering at a temperature of lower than or equal to 1000° C.
Implementation Method 2
excellent in a Q value and humidity resistance after the sintering
Data Source
AI summary
A dielectric ceramic composition includes: Mg2SiO4 as main component; R-containing, Cu-containing, and B-containing compounds, and Li-containing glass, as sub-component. R is an alkaline earth metal. R-containing compound greater than or equal to 0.2 part by mass and less than or equal to 4.0 parts by mass, contained in terms of oxide, Cu-containing compound of greater than or equal to 0.5 part by mass and less than or equal to 3.0 parts by mass, contained in terms of oxide, and B-containing compound greater than or equal to 0.2 part by mass and less than or equal to 3.0 parts by mass, contained in terms of oxide, to 100 parts by mass of main component. Li-containing glass of greater than or equal to 2 parts by mass and less than or equal to 10 parts by mass contained to total a 100 parts by mass of main component, and sub-component excluding Li-containing glass.