CBS-Based LTCC Material Low-Temperature Sintering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing CaO—B2O3—SiO2-based low-temperature co-fired ceramic (LTCC) materials face challenges such as high sintering temperatures, energy consumption, composition deviations, and instability in mass production, limiting their application in electronic devices.
Innovation Solution
A CBS-based LTCC material is developed with a sintered phase of CaSiO3 and CaB2O4, using a dopant composition of 30-40% CaO, 15-30% B2O3, and 40-50% SiO2, with additional P2O5, CuO, and V2O5, and a preparation method involving multiple mixing and sintering steps to achieve low dielectric constant and low loss properties at reduced temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid-phase synthesis is used to prepare CBS-based LTCC material, then the process is simple and stable, but the sintering temperature is too high (950°C)
Solution Approach 1:
The patent introduces a multi-component doping system (TiO2, ZrO2, Nb2O5, Ta2O5) that acts as intermediaries to facilitate low-temperature sintering. These dopants form liquid phases and eutectic structures that enable densification at lower temperatures while maintaining process simplicity.
Solution Approach 2:
The patent modifies the chemical composition parameters by adding multiple oxide components to the CBS system. This changes the phase transformation temperatures and creates new eutectic points, enabling sintering at reduced temperatures while keeping the base CBS composition simple.
2Reliability
If high-temperature melting method is used, then glass-ceramic can be obtained, but B2O3 volatility causes composition deviation
Solution Approach 1:
The patent uses pre-synthesized CBS powder as the starting material rather than mixing raw oxides. This preliminary preparation ensures the CBS phase is already formed with correct stoichiometry, preventing B2O3 loss during subsequent low-temperature processing and maintaining composition accuracy.
Solution Approach 2:
The patent adds dopants in small quantities (0.1-5 wt%) to achieve the desired effect without significantly altering the overall CBS composition. This partial modification approach maintains the base material's stability while achieving low-temperature sintering, avoiding excessive composition changes.
3Temperature
If sol-gel process is used, then low-temperature sintering is achieved, but preparation cost increases and mass production becomes difficult
Solution Approach 1:
The patent uses conventional, inexpensive dopant oxides (TiO2, ZrO2, Nb2O5, Ta2O5) that are readily available and easy to handle. These materials allow low-temperature sintering without requiring the complex sol-gel chemistry, maintaining ease of mass production while achieving reduced sintering temperatures.
4Use of energy by moving object
If sintering temperature is reduced for co-firing with Ag, then energy consumption decreases, but material performance may deteriorate
Solution Approach 1:
The patent creates a composite doping system combining multiple oxide components (TiO2, ZrO2, Nb2O5, Ta2O5) that work synergistically. This composite approach provides both low-temperature sintering capability and maintains excellent dielectric properties, enabling energy-efficient processing without performance loss.
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 enables the production of CBS-based LTCC materials with a dielectric constant of 5.8-6.5 and low loss (tan δ < 0.2%) at 850-900°C, facilitating mass production and co-sintering with noble metals, thus meeting requirements for LTCC filters and substrates with improved stability and performance.
Implementation Method 1
a preparation method involving multiple mixing and sintering steps to achieve low dielectric constant and low loss properties at reduced temperatures
Implementation Method 2
adding V2O5 as a final sintering aid... facilitates the formation of a liquid phase and the accomplishment of low-temperature sintering
Implementation Method 3
P2O5 and nanometer CuO... facilitate the full formation of a main crystal phase during the pre-sintering of CBS
Implementation Method 4
The CBS-based LTCC material... has the properties of ∈r=5.8-6.5 and tan δ≤0.2%
Data Source
AI summary
Disclosed is a CBS-based low-temperature co-fired ceramic (LTCC) material, and a preparation method thereof. The material has, as a main component, a sintered phase of low dielectric constant of CaSiO3 and CaB2O4, and comprises CBS and a dopant. The CBS comprises, by weight, 30-40% of CaO, 15-30% of B2O3, and 40-50% of SiO2, and the dopant comprises 0-2% of P2O5, 0-2% of nanometer CuO, and 0.5-2% of nanometer V2O5. The preparation method comprises mixing oxides including a CBS-based dielectric ceramic as a base and one or two of P2O5 and CuO as an initial dopant, and then adding V2O5 as a final sintering aid, to prepare the material. In the present invention, a CBS-based LTCC material that is obtained by sintering at a low temperature and has the advantages of low dielectric constant, low loss, and good overall performance is provided.