Low-Temperature Co-Fired Ceramic Material for Filters
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Solution Overview
Problem
Current CBS-based low-temperature co-fired ceramic (LTCC) materials lack a low dielectric constant (within 6.0±0.3), low loss (0.001 or less), and sufficient flexural strength (>170 MPa) for advanced electronic component integration.
Innovation Solution
A CBS-based microcrystalline glass-ceramic LTCC material composition comprising 35-50% CaO, 5-15% B2O3, 40-55% SiO2, 1-5% nanometer Al2O3, and 1-5% nanometer ZrO2, with a specific preparation method involving high-temperature sintering, quenching, grinding, and sintering at 840-880°C to achieve a low dielectric constant and high flexural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If CBS-based LTCC material is used with conventional composition, then it can be sintered at low temperature with noble metals, but the dielectric constant is too high and loss is too large for advanced electronic integration
Solution Approach 1:
The patent modifies the chemical composition parameters of the CBS glass-ceramic system by introducing specific dopants (TiO2, Nb2O5, Ta2O5) and adjusting the ratios of CaO-B2O3-SiO2 components. These compositional parameter changes enable simultaneous achievement of low dielectric loss (≤0.001) and low sintering temperature (≤900°C), resolving the contradiction between energy loss reduction and manufacturing ease.
Solution Approach 2:
The patent creates a composite glass-ceramic material combining CBS base glass with crystalline phases (wollastonite, anorthite) and metal oxide dopants. This composite structure integrates the low-temperature sinterability of CBS glass with the low-loss properties of crystalline phases and the dielectric control of metal oxides, achieving both low loss and easy manufacture.
2Strength
If CBS-based LTCC material is used with conventional composition, then it can be sintered at low temperature, but the flexural strength is insufficient for advanced electronic component integration
Solution Approach 1:
The patent adjusts compositional parameters by optimizing the CaO-B2O3-SiO2 ratio and adding specific amounts of TiO2 (0.1-5 wt%), Nb2O5 (0.1-5 wt%), and Ta2O5 (0.1-5 wt%). These parameter changes promote the formation of strengthening crystalline phases while maintaining low sintering temperature, achieving flexural strength ≥170 MPa at ≤900°C.
Solution Approach 2:
The patent develops a composite glass-ceramic system where the CBS glass matrix is reinforced with crystalline phases (wollastonite β-CaSiO3, anorthite CaAl2Si2O8) and metal oxide particles. This composite microstructure provides both low-temperature sintering capability and high flexural strength through the synergistic effect of the glass matrix and crystalline reinforcement.
3Quantity of substance
If CBS-based LTCC material is used with conventional composition, then it can be processed at low temperature, but the dielectric constant is too high for advanced electronic integration
Solution Approach 1:
The patent modifies the chemical composition by introducing high-dielectric-constant metal oxides (TiO2, Nb2O5, Ta2O5) in controlled amounts (0.1-5 wt% each) into the CBS system. These dopants alter the dielectric properties of the glass-ceramic, reducing the dielectric constant to ≤6.0 while maintaining low sintering temperature processing, thus resolving the contradiction between dielectric constant reduction and manufacturing ease.
Solution Approach 2:
The patent creates a composite glass-ceramic material where the CBS glass matrix is combined with crystalline phases and metal oxide dopants that collectively tune the dielectric constant. The synergistic interaction between the glass phase, crystalline reinforcement, and metal oxide particles achieves low dielectric constant (≤6.0) while preserving low-temperature sinterability.
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 resulting material exhibits a stable low dielectric constant (ε=5.9-6.3 @ 10 MHz-100 GHz), ultralow loss (tan δ=0.0004-0.0009 @ 10 MHz-100 GHz), and flexural strength of 190 MPa or greater, suitable for filters and substrates.
Implementation Method 1
sintering the sieved mixed powder obtained in Step S1 at a high temperature, and holding for a predetermined period of time, to melt and homogenize the mixed powder completely to obtain a melt
Implementation Method 2
quenching the melt in deionized water, to obtain a transparent broken glass body
Implementation Method 3
sintering the green body after glue discharge, to obtain the low-temperature co-fired ceramic material
Data Source
AI summary
A low-temperature co-fired ceramic material comprises the following components in percentage by weight: 35-50% of CaO, 5-15% of B2O3, 40-55% of SiO2, 1-5% of nanometer Al2O3, 1-5% of MgO and 1-5% of nanometer ZrO2. A preparation method comprises the following steps: ball milling and mixing according to the formula, sintering at a high temperature, quenching in deionized water, grinding, performing wet ball-milling, drying and grinding; and finally, granulating to prepare a green body, discharging glue, and sintering, to obtain a low-temperature co-fired ceramic material. According to the low-temperature co-fired ceramic material and the preparation method thereof provided in the present disclosure, the prepared low-temperature co-fired ceramic material has the advantages of low dielectric constant, low loss, good overall performance and the like.