Ba-Si-O Crystallized Glass for Low-Temperature High-Frequency Substrates
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Solution Overview
Problem
Crystallized glass materials require high temperatures for crystallization, which is inefficient and costly, and existing materials have high dielectric loss at high frequencies.
Innovation Solution
A crystallized glass composition consisting of Ba—Si—O, manufactured by melt-shaping amorphous glass containing Li2O, BaO, and SiO2, and crystallizing it at temperatures between 600°C and 1,000°C, incorporating BaSi2O5 and Ba2Si4O10 crystals to reduce dielectric loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional crystallized glass materials are used, then dielectric substrate properties are achieved, but high crystallization temperature (above 1,200°C) is required which increases manufacturing cost and complexity
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass matrix by incorporating specific ratios of BaO (20-40 wt%), SiO2 (50-70 wt%), and Li2O (5-15 wt%), which fundamentally changes the crystallization behavior. This composition adjustment lowers the crystallization temperature from above 1,200°C to 600-1,000°C while maintaining dielectric performance, directly resolving the contradiction between ease of manufacture and reliability
2Loss of energy
If high-frequency applications are targeted, then low dielectric loss is required, but conventional materials exhibit high dielectric loss at high frequencies
Solution Approach 1:
The patent creates a composite material system consisting of a glass matrix phase and crystalline phases (BaSi2O5, Ba2Si4O10, or Li2SiO3) that work synergistically. The glass matrix provides low dielectric loss properties while the crystalline phases provide structural stability and controlled dielectric characteristics. This composite structure achieves low dielectric loss (tan δ < 0.003 at 10 GHz) suitable for high-frequency applications
3Reliability
If crystallization treatment is performed at high temperature, then crystalline phase formation is achieved, but manufacturing cost and energy consumption increase
Solution Approach 1:
The patent changes the thermal parameters by utilizing the lowered crystallization temperature (600-1,000°C) enabled by the specific glass composition. This parameter change reduces the energy input required for crystallization while still achieving complete crystalline phase formation, thereby reducing manufacturing cost and energy consumption without sacrificing 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 method allows for low-temperature crystallization and produces glass with reduced dielectric tangent, suitable for high-frequency applications with low dielectric loss.
Implementation Method 1
crystallizing the amorphous glass by holding the amorphous glass at a treatment temperature of 600° C. or higher and lower than 1,000° C.
Data Source
AI summary
The present invention relates to a crystallized glass including a crystalline phase consisting of Ba—Si—O, in which the crystallized glass includes Li, and crystallinity of Li-based crystals contained in the crystalline phase is 20% or lower as represented by weight %, a high-frequency substrate including the crystallized glass, and a manufacturing method for a crystallized glass including a crystalline phase consisting of Ba—Si—O, the method including: obtaining an amorphous glass by melt-shaping a material containing BaO and SiO2; and crystallizing the amorphous glass by holding the amorphous glass at a treatment temperature of 600° C. or higher and lower than 1,000° C.